Nitrogen Generating System
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NGS is fully operational. NGS is operational, but it is operating in a degraded condition. NGS is inoperative. PowerPoint PPT Presentation


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Nitrogen Generating System. Operational Serviceable Degraded Temporary Serviceable Inoperative Unserviceable. NGS is fully operational. NGS is operational, but it is operating in a degraded condition. NGS is inoperative. No lights illuminated also indicates NGS is inoperative.

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NGS is fully operational. NGS is operational, but it is operating in a degraded condition. NGS is inoperative.

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Nitrogen generating system

Nitrogen Generating System

Operational

Serviceable

Degraded

Temporary Serviceable

Inoperative

Unserviceable

  • NGS is fully operational.

  • NGS is operational, but it is operating in a degraded condition.

  • NGS is inoperative.

  • No lights illuminated also indicates NGS is inoperative.

    • Contact Dispatch for deferral under the provisions of MEL 47-1


Nitrogen generating system

GRD POWER AVAILABLE

  • Ground power is connected and meets aircraft power quality standards

  • (-300/500) Ground power is connected


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ELEC

BAT

DISCHARGE

  • Normal indication for a battery start

    • The MASTER CAUTION light will not be illuminated

  • Battery switch must be on in order to apply ground power

    • Wait 5 seconds (60 seconds for an APU start)

  • There is no minimum battery voltage required to start the APU

  • Excessive battery discharge detected with the battery switch on

    • Item is not deferrable

    • A fully charged battery provides a minimum of 30 minutes of standby power, (N550WN and N551WN 60 minutes)

    • (N550WN and N551WN) a charging problem with either the main or auxiliary batteries


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

MASTERCAUTION

PUSH TO RESET

OVHT/DET

  • The indications for the FAULT/INOP test

    • A total of 5 lights

FAULT

APU DET

INOP

Fire Panel


Nitrogen generating system

FIRE

WARN

BELL CUTOUT

MASTERCAUTION

PUSH TO RESET

MASTERCAUTION

PUSH TO RESET

FIRE

WARN

BELL CUTOUT

OVHT/DET

  • The indications for the OVHT/FIRE test

    • AC power required for the wheel well light

    • A total of 11 lights

DISCH

DISCH

WHEEL

WELL

DISCH

A

P

U

1

2

ENG 1

OVERHEAT

ENG 2

OVERHEAT

Fire Panel


Nitrogen generating system

FIRE

WARN

BELL CUTOUT

MASTERCAUTION

PUSH TO RESET

MASTERCAUTION

PUSH TO RESET

FIRE

WARN

BELL CUTOUT

OVHT/DET

  • A or B fire loop inoperative for engine #1

    • AC power required for wheel well light

  • (-300/-500): An illuminated FAULT light is the only indication that differs from a normal test

    • The exception is for an open circuit which will also cause the related ENGINE FIRE WARNING switch and ENGINE OVERHEAT light to remain extinguished

WHEEL

WELL

DISCH

DISCH

DISCH

FAULT

A

P

U

1

2

ENG 1

OVERHEAT

ENG 2

OVERHEAT

or

or

Fire Panel

ENG 1

OVERHEAT

DISCH

-300/500

1

-300/500


Nitrogen generating system

E T

X E

T S

T

1

2

L

R

  • EXT TEST switch is positioned to 1 or 2 and circuit continuity is normal

APU


Nitrogen generating system

ALIGN

  • Steady-the related IRS is operating in the ALIGN mode, the initial ATT mode, or the shutdown cycle

  • Flashing-alignment cannot be completed due to IRS detection of:

    • Significant difference between previous and entered positions (unreasonable present position, i.e. SJC instead of SLC, LAS instead of LAX), or

    • No present position entry

    • Aircraft movement

  • Align light extinguished:

    • IRS not in ALIGN mode

    • With mode selector in NAV, alignment is complete, and all IRS information is available

    • With mode selector in ATT, attitude information is available

    • Heading information is available following entry of initial magnetic heading


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FAULT

IRS

  • Respective IRS system has detected a fault

  • A system fault affecting the related IRS ATT and/or NAV modes has been detected

  • The IRS ATT and/or NAV modes may be inoperative

  • IRS failure may be caused by loss of AC and DC power to the IRS; no warning lights will illuminate

  • Indication of a complete power loss:

    • Attitude flag on the respective ADI

    • A heading flag on the respective HSI

    • Loss of vertical speed information


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

DC FAIL

IRS

  • Related IRS DC power has failed

  • DC power for the related IRS is not normal

  • If the other lights are extinguished, the IRS is operating normally on AC power

  • With both IRS DC FAIL lights illuminated, the switched hot battery bus is not powered, or the battery is nearly discharged

    • If the battery is discharged, fire protection capability from the Hot Battery Bus is lost


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ON DC

IRS

  • The related IRS is operating on DC power from the switched hot battery bus (AC power not normal)

  • If on the ground, the ground-call horn in the nose wheel well sounds, providing an alert that abattery drain condition exists (gate services-external power has failed)

  • Momentary illumination is normal during alignment self-test (OFF to NAV)

  • A timer removes DC power from the right IRS after 5 minutes


Nitrogen generating system

GPS

  • GPS failure

  • A failure in both GPS sensor units

  • A failure in a single GPS sensor unit when either system annunciator panel is pushed and held


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

PSEU

OVERHEAD

  • A designated proximity switch electronic unit fault has been detected

  • If the light illuminates only during an annunciator recall, only a simple fault has been detected

  • The PSEU light monitors:

    • Takeoff configuration warnings

    • Landing configuration warnings

    • Landing gear

    • Air/ground sensing

    • Overwing exit doors

  • The PSEU light illuminates on the ground only

  • An actual failure is not deferrable

  • On ground—a fault is detected in the PSEU, or an overwing exit flight lock fails to disengage when commanded

  • In flight—inhibited from thrust lever advance for takeoff until 30 seconds after landing


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ENG

REVERSER

  • Fault detected in the related engine reverser system

  • If the REVERSER light illuminates inflight, additional system failures may cause deployment

    • Expect normal reverser operation after touchdown

  • If the REVERSER light illuminates on the ground, reverse thrust may not be available

  • Comparator senses a disagreement between the position of the isolation valve or thrust reverser control valve

  • (-300/500) Reverser isolation valve and the selector valve is not in commanded position

  • Disagreement between the reverser sleeve position sensors (one or more thrust reverser sleeves are not in commanded state)

  • Thrust lever commanded to stow and extinguishes 10 seconds later when the isolation valve closes (auto-restow circuit has been activated)

    • If this action does not occur within approximately 12 seconds, the MASTER CAUTION and ENG lights will illuminate

  • Failure has been detected in the synchronization shaft lock circuitry

    • (-300/500 N/A)

  • Takeoff or Landing is not authorized

    • Either thrust reverser is inoperative and the runway is contaminated with clutter or the braking action is less than “GOOD”


Nitrogen generating system

ON

  • Associated EEC is selected on

  • (-300/500) Associated PMC is selected on


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ENG

ON

ALTN

ALTN

  • The EEC has automatically selected the soft alternate mode

  • EGT limits must be observed in both normal and alternate control modes


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ENGINE CONTROL

ENG

#1 or #2

  • Engine control system fault

  • On the ground only with the engines operating, below 80 knots on the takeoff roll

  • Are inhibited for approximately 30 seconds after touchdown

  • Are not dispatchable due to faults in the engine control system


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ENG

INOP

-300/500

  • PMC inoperative when N2 is greater than 46%

  • PMC is selected off


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ENG

LOWIDLE

  • Thrust lever for either engine near idle and the MEC of either engine not commanded to maintain high idle RPM in-flight

  • Speed for either engine below 25% N1 in-flight

  • (-500) One or both start switches in FLT and one or both engines below 45% N1 above 500’ RA

  • RPM for one or both engines is below the minimum required for engine acceleration during a go-around

  • If an engine start lever is in CUTOFF, the light is deactivated

-300/500


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

PASS OXY ON

OVERHEAD

  • The system is activated:

    • Automatically by a pressure switch at a cabin altitude of 14,000 feet, or

    • When the passenger oxygen switch is positioned to ON

  • The masks have dropped


Nitrogen generating system

LEFTGEAR

RIGHTGEAR

  • Related gear is down and locked

  • Landing gear warning horn is deactivated with all gear down and locked

  • Landing gear is down and locked as long as one green landing gear indicator light (center panel or overhead panel) for each gear is illuminated

    • There are no red indication lights for the aft overhead gear lights

NOSEGEAR

-700 ONLY, AFT OVERHEAD PANEL


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

OFF

OVERHEAD

  • The flight recorder is not operating

    • Power failure

    • Loss of input data

    • Electronic malfunction

  • The test is invalid

FLIGHT RECORDER


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

LOW

PRESSURE

  • The flight control LOW PRESSURE light illuminated indicates the related hydraulic system pressure to ailerons, elevator and rudder is low

  • Flight control switch to standby rudder:

    • The standby hydraulic pump starts

    • Shuts off the related hydraulic system pressure to ailerons, elevators and rudder by closing the flight control shutoff valve

    • Opens standby rudder shutoff valve to pressurize standby rudder power control unit

      • The standby rudder power control on light illuminates (if installed)

    • The standby LOW PRESSURE light is armed

    • The flight control LOW PRESSURE light extinguishes (deactivated) when the standby rudder shutoff valve opens

    • Allows the standby system to power the rudder and thrust reversers

A or B

STBY RUD ON


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

LOW

QUANTITY

STANDBY

  • The standby hydraulic LOW QUANTITY light illuminated indicates low fluid level in the standby hydraulic reservoir (less than 50%)

  • Always armed

  • An actual standby system low quantity is not deferrable


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

LOW

PRESSURE

STANDBY

  • The standby hydraulic LOW PRESSURE light illuminated indicates low output pressure from the electric motor driven standby pump

  • Armed only when standby pump operation has been selected:

    • A or B flight control switch to standby rudder

    • Alternate flaps master switch to ALTERNATE FLAPS

  • Or automatic standby function is activated:

    • With a loss of system A or B

    • Flaps are extended

    • Airborne, or on the ground with a wheel speed greater than 60 knots

    • (RSEP, if installed) The main PCU force fight monitor (FFM) activates

  • An actual standby hydraulic pump failure is not deferrable


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

STBY RUD ON

  • The STBY RUD ON light illuminated indicates the standby rudder power control unit is pressurized (if installed)

  • This item may or may not be deferrable, for dispatching requirements, refer to MEL 27


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

YAW

DAMPER

  • The YAW DAMPER light illuminated indicates the yaw damper is not engaged

  • Trips off:

    • B flight control switch to OFF or STBY RUD

    • Loss of external power (gate services)


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

FEEL DIFF PRESS

  • The FEEL DIFF PRESS light illuminated indicates the feel computer is sensing a significant pressure differential between hydraulic systems A and B or between the left and right elevator pitot pressure inputs

  • A leak in any portion of the system resulting in the illumination of the FEEL DIFF PRESS light is not deferrable


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

MACH TRIM FAIL

  • The MACH TRIM FAIL light illuminated indicates both channels of the Mach trim system have failed

  • If the light illuminates only when the system annunciator panel is pressed to recall, only a single channel has failed but the Mach trim system is still operative

    • Airspeed……………Limit To 280 Knots/.82 Mach Max (-300/500 .74 Mach Max)


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

SPEED TRIM FAIL

  • The SPEED TRIM FAIL light illuminated indicates both channels of the speed trim system have failed

  • If the light illuminates only when the system annunciator panel is pressed to recall, only a single channel has failed but the speed trim system is still operative.


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

AUTO SLAT FAIL

  • The AUTO SLAT FAIL light illuminated indicates both auto slat channels have failed

  • If the light illuminates only when the system annunciator panel is pressed to recall, only a single channel has failed but the auto slat system is still operative


Nitrogen generating system

ENG VALVE CLOSED

FUEL VALVE CLOSED

  • Extinguished—related engine or spar fuel shutoff valve is open

  • Bright—related engine or spar fuel shutoff valve is in transit, or valve position and engine start lever or engine fire warning switch disagree

  • Dim—related engine or spar fuel shutoff valve (-300/500 fuel valve) is closed

-300/500

SPAR VALVE CLOSED

FUEL PANEL


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FILTER BYPASS

FUEL

  • The fuel FILTER BYPASS light illuminated indicates impending filter bypass due to contamination

  • Degraded engine operation may result due to a contaminated filter


Nitrogen generating system

VALVE OPEN

  • Bright—crossfeed valve is in transit, or valve position and crossfeed selector disagree

  • Dim—crossfeed valve is open

  • Extinguished—crossfeed valve is closed

  • The valve failed in the closed position is indicated by the crossfeed VALVE OPEN light illuminated bright with the crossfeed selector in the open position

  • The valve failed in the open position is indicated by the crossfeed VALVE OPEN light illuminated bright with the crossfeed selector in the closed position

FUEL CROSSFEED VALVE


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

LOWPRESSURE

FUEL

CENTER TANK PUMP

  • Fuel pump output pressure is low and fuel pump switch is ON

  • With both center tank fuel pump switches ON:

    • Illumination of both LOW PRESSURE lights illuminate the MASTER CAUTION and FUEL system annunciator lights

    • Illumination of one LOW PRESSURE light illuminates the MASTER CAUTION and FUEL system annunciator lights only with MASTER CAUTION light recall

    • On newer aircraft, and those that have been modified, illumination of one LOW PRESSURE light illuminates the MASTER CAUTION and FUEL system annunciator lights without recall

  • With one center tank fuel pump switch OFF, illumination of opposite center tank LOW PRESSURE light illuminates the MASTER CAUTION and FUEL system annunciator lights

  • Extinguished—fuel pump output pressure is normal, or fuel pump switch is OFF

  • The lights may flicker when tank quantity is low and the aircraft is in turbulent air, climb, or descent


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

LOWPRESSURE

FUEL

MAIN TANK PUMP

  • Fuel pump output pressure is low and fuel pump switch is ON

  • Two LOW PRESSURE lights illuminated in the same tank illuminate the MASTER CAUTION and FUEL system annunciator lights

  • One LOW PRESSURE light causes the MASTER CAUTION and FUEL system annunciator lights to illuminate only on MASTER CAUTION light recall

  • Extinguished—fuel pump output pressure is normal

  • The lights may flicker when tank quantity is low and the aircraft is in turbulent air, climb, or descent


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FAULT

APU

HIGH OIL TEMP

  • APU malfunction or high oil temperature within the APU

  • APU shuts down automatically

  • (-700) If the light is illuminated when APU switch is placed to OFF, light extinguishes in 5 minutes

  • If the fuel valve has failed, the FAULT light remains illuminated

  • Light is disarmed when the APU switch is in OFF position

-300/500


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

MAINT

APU

LOW OIL

QUANTITY

  • APU maintenance problem exists

  • APU may be operated

  • APU oil quantity insufficient for extended operation

  • Light is disarmed when APU switch is OFF

-300/500


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

LOW OIL

PRESSURE

APU

  • APU low oil pressure

  • APU shuts down automatically

  • Normal indication during an APU start

  • If the light does not extinguish after the APU

    is running, an automatic shutdown will occur


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

OVER

SPEED

APU

  • APU RPM limit exceeded, the APU shuts down automatically

  • (-300/500) An APU start has been aborted prior to the APU

    reaching normal operating speed

  • The overspeed protection feature has failed a self-test during a normal APU shutdown

  • (-700) If light is illuminated when APU switch is placed to OFF,

    light extinguishes in 5 minutes

  • Light is disarmed when APU switch is in the OFF position


Nitrogen generating system

DISCH

LOW OIL

PRESSURE

OVER

SPEED

FAULT

A

P

U

HIGH OIL TEMP

  • APU automatic shutdown protection:

    • APU fire

    • Low oil pressure

    • Fault (-300/500: High oil temperature)

    • Overspeed conditions

    • Other system faults monitored by the electronic control unit (ECU)

      (-300/500 N/A)

      • Fuel control unit failure

      • EGT exceedance

-300/500


Nitrogen generating system

APU GENOFF BUS

  • APU is running but not powering a bus

  • (-300/500) APU is at its operating speed and not powering a generator bus


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ELEC

TRANSFER BUS OFF

  • The respective transfer bus is not powered

  • Item is not deferrable


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ELEC

SOURCE

OFF

  • The related transfer bus is not powered by the last selected source

  • No source has been manually selected to power the related transfer bus

  • The manually selected source has been disconnected


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ELEC

BUS

OFF

-300/500

  • The BUS OFF light illuminated indicates the respective generator bus is not powered


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ELEC

STANDBYPOWER OFF

  • One or more of the following busses are unpowered:

    • AC standby bus

    • DC standby bus

    • Battery bus

  • (-300/500): Standby busses are inactive

  • Item is not deferrable

  • Standby power switch to OFF:

    • AC standby bus

    • Static inverter, and

    • DC standby bus are not powered


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ELEC

DRIVE

  • Malfunction in the related generator drive unit

  • IDG failure

  • Engine shutdown

  • IDG automatic disconnect due to high oil temperature

  • IDG disconnected through the generator drive disconnect switch

  • It is deferrable

    • Southwest Airlines has now received MEL relief for an inoperative engine-driven generator (MEL 24-1) on aircraft N281 and subsequent

    • If an engine driven generator is inoperative, these aircraft may be dispatched at an altitude of FL220 or below (RBF #A-07-91)

    • The MEL/CDL block of the flight release will list MEL 24-1, and the REMARKS block will contain the altitude restriction of FL220

  • If the APU generator is successfully placed on the bus, you may continue to the destination airport

    • (N281WN and subsequent) If the momentary underspeed when passing through FL260 causes an APU generator disconnect, simply wait for the APU to stabilize and then place the APU generator back on the bus


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ELEC

ELEC

  • A fault in the DC or standby power system

  • The light illuminates only on the ground

  • Item is not deferrable


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ELEC

TR UNIT

  • On the ground if any TR has failed

  • Inflight if TR 1 failed, or TR 2 and TR 3 failed

  • Item is not deferrable


Nitrogen generating system

GEN OFF

BUS

  • IDG is not supplying power to the related transfer bus

  • (-300/500) Related generator is not supplying power to the related generator bus


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

OVERHEAD

OFF

OFF

-700

SUPPLY

EXHAUST

  • Loss of airflow due to failure of an equipment cooling fan

  • A failure of the normal cooling supply fan or the normal cooling exhaust fan, or a failure of the power source for the fans

  • (-300/500) A failure of the normal cooling fan or a failure of the ground service bus which supplies power to the normal cooling fan

OFF

-300/500


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

N

O

T

A

R

M

E

D

OVERHEAD

  • Emergency exit switch not in the armed position

  • If armed, the emergency exit lights illuminate automatically if:

    • Electrical power to DC bus 1 fails, or

    • If AC power is turned off

EMER EXIT LIGHTS


Nitrogen generating system

CALL

  • Flightdeck is being called by Flight Attendants or Ground Crew

  • ATSCALL: (if installed)

    • Flashing-system is receiving an ALL CALL or a SELECTIVE call signal

    • Steady-indicates a defective push-to-talk circuit

    • Turning off the power switch will extinguish the light


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ANTI-ICE

OVERHEAT

WINDOW HEAT PANEL

  • The window OVERHEAT light illuminated indicates a window overheat condition

  • The window heat control unit automatically removes power to the respective window in the event of an overheat condition

  • The window heat ON light goes off

  • OVERHEAT lights also illuminate if electrical power to window(s) is interrupted


Nitrogen generating system

ON

WINDOW HEAT PANEL

  • Window heat is being applied to selected window(s)

  • Extinguished:

    • Switch is OFF

    • An overheat is detected

    • Ambient window temperature is above a pre-determined limit

    • System failure has occurred

  • Do not perform a power test when all green ON lights are illuminated


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ANTI-ICE

CAPTPITOT

F/OPITOT

CAPT P/S1 AUX STATIC

F/O P/S2 AUX STATIC

L ELEV PITOT

R ELEV PITOT

F/O STATIC 2 AUX P/S

CAPT STATIC 1 AUX P/S

  • The PROBE HEAT (-300/500: PITOT-STATIC) light(s) illuminated indicates the related probe is not heated

  • Erroneous or unreliable airspeed indications may be caused by blocked or frozen pitot-static systems, or a severely damaged or missing radome

  • If operating on standby power, probe heat lights do not indicate system status

  • Avoid icing conditions, MEL 30-8

L ALPHA VANE

R ALPHA VANE

L ELEV PITOT

R ALPHA VANE

R ELEV PITOT

TEMPPROBE

TEMPPROBE

AUXPITOT

L ALPHA VANE

R ALPHA VANE

TEMPPROBE

-300/500


Nitrogen generating system

L VALVE OPEN

R VALVE OPEN

  • The Wing Anti-ice Valve Open Lights illuminate as follows:

    • BRIGHT-Related wing anti-ice control valve is in transit or related wing anti-ice control valve position disagrees with the wing anti-ice switch position

    • DIM- Related wing anti-ice control valve is open (switch ON)

      • Sets the stick shaker logic for icing conditions

      • In flight, adjusts the stick shaker logic and the minimum maneuver speed bars on the MASI for the remainder of the flight regardless of switch position

    • EXTINGUISHED-Related wing anti-ice control valve is closed (switch OFF)


Nitrogen generating system

COWL VALVE OPEN

1 or 2

  • The Cowl Anti-ice Valve Open Lights illuminate as follows:

    • BRIGHT-Related cowl anti-ice control valve is in transit or related cowl anti-ice control valve position disagrees with the engine anti-ice switch position

    • DIM- Related cowl anti-ice control valve is open (switch ON)

      • Adjusts the stick shaker and minimum maneuvering speed bars on the MASI

      • Adjusts the EEC’s for engine idle control and the FMC's compensate fuel scheduling for bleed loads

      • FMC displayed VREF is not adjusted

    • EXTINGUISHED-Related cowl anti-ice control valve is closed (switch OFF)

      • Stick shaker logic returns to normal if wing anti-ice has not been used in-flight


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ANTI-ICE

COWL

ANTI-ICE

1 or 2

  • The COWL ANTI-ICE light illuminated indicates:

    • An overpressure condition in the cowl anti-ice duct

    • (-300/500) Overpressure or overtemperature condition in the cowl anti-ice duct


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

OVERHEAT

OVERHEAT

HYD

ELEC 2

ELEC 1

  • An electric hydraulic pump OVERHEAT light illuminated indicates fluid or pump overheat

  • An actual hydraulic pump overheat is not deferrable


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

HYD

ENGINE 1

ELEC 2

A

  • Loss of system A hydraulics is indicated by system A pressure at zero

  • FEEL DIFF PRESS light when the flaps are up (on some aircraft, the light will also be illuminated with the flaps down)

  • A autopilot if engaged, disengages

  • When an engine fire warning switch is pulled, the related engine driven pump LOW PRESSURE light is deactivated

  • Alternate systems:

    • # 1 Thrust reverser/Standby hydraulic

    • Landing gear/Manual extension (extend only)

    • Alternate nosewheel steering/System B

LOWPRESSURE

LOWPRESSURE

FEEL DIFF

PRESS

LOWPRESSURE

LOWPRESSURE

A HYDRAULIC PUMPS

FLIGHT CONTROL PANEL


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

HYD

ELEC 1

ENGINE 2

B

  • Loss of system B hydraulics is indicated by system B pressure at zero

  • FEEL DIFF PRESS light when the flaps are up (on some aircraft, the light will also be illuminated with the flaps down)

  • B autopilot if engaged, disengages

  • When an engine fire warning switch is pulled, the related engine driven pump LOW PRESSURE light is deactivated

  • Alternate systems:

    • # 2 Thrust reverser/Standby hydraulic

    • Leading edge flaps & slats/Standby hydraulic (extend only)

    • Trailing edge flaps/Electric

    • Alternate brakes/System A

LOWPRESSURE

LOWPRESSURE

FEEL DIFF

PRESS

LOWPRESSURE

LOWPRESSURE

B HYDRAULIC PUMPS

FLIGHT CONTROL PANEL


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

FLT CONT

HYD

A

B

A & B ENGINE/ELEC

  • Manual reversion is necessitated by the loss of hydraulic systems A and B and is indicated by the system A and B pressure at zero

  • A or B autopilot if engaged, disengages

  • When an engine fire warning switch is pulled, the related engine driven pump LOW PRESSURE light is deactivated

  • Alternate systems:

    • Thrust reverser/Standby hydraulic

    • Landing gear/Manual extension (extend only)

    • Brakes/Accumulator pressure only

    • Leading edge devices/Standby hydraulic (extend only)

    • Trailing edge flaps/Electric

    • Rudder/Standby hydraulic

    • Standby yaw damper/Standby hydraulic (-300/500 N/A)

LOWPRESSURE

LOWPRESSURE

LOWPRESSURE

LOWPRESSURE

LOWPRESSURE

HYDRAULIC PUMPS

FLIGHT CONTROL PANEL


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

LEFTOVERWING

RIGHTOVERWING

DOORS

  • The door is unlocked

  • The related flight lock failed to engage

  • The overwing hatches lock automatically from takeoff to 30 seconds after landing

  • A DOOR annunciator light illuminated may indicate an exterior door is not properly latched

  • Cabin pressurization should be secure, unless some type of damage to the door has occurred


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

DUAL

BLEED

DUAL

BLEED

AIR COND

  • The APU bleed valve is open, and

    • Either the number 1 bleed switch is ON, or

    • The number 2 bleed switch is ON and the isolation valve is OPEN

  • If the APU bleed air check valve fails, any of these conditions could allow engine bleed air to enter the APU bleed ducting and cause overpressure damage to APU components

  • The DUAL BLEED light is a normal indication during engine start


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

OFF SCHED DESCENT

AIR COND

  • The selected flight altitude has not been reached and the aircraft is descending

  • No action is necessary if the aircraft is returning to the airport of departure


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

DUCTOVERHEAT

AIR COND

  • Bleed air temperature in related duct exceeds limit

  • Air mix valves drive full cold

  • Requires reset


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

PACK

TRIP OFF

AIR COND

  • Indicates pack or supply duct temperature has exceeded limits

  • Related pack valve automatically closes and mix valves drive full cold

  • Requires reset


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

BLEEDTRIP OFF

AIR COND

  • Indicates that the engine bleed air temperature or pressure is excessive

  • Illumination of the BLEED TRIP OFF light during a bleeds-off takeoff indicates excessive bleed pressure exists

  • Ensure the related wing anti-ice switch is turned off prior to depressing the trip reset button

  • The bleed air valve closes automatically

  • Loss of bleed air causes the respective pack valve to close

  • Requires reset


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

AUTO

ALTN

AIR COND

  • Loss of DC power to the controller

  • Controller fault

  • Outflow valve control fault

  • Excessive differential pressure

  • Excessive rate of cabin pressure change (± 2000 fpm)

  • High cabin altitude (above 15,800 feet)

  • With AUTO selected, illumination of both AUTO and ALTN FAIL lights indicates a single controller failure and automatic transfer to the alternate mode

  • Illumination of only the AUTO FAIL light indicates failure of both automatic pressurization controllers

  • Automatic pressurization system failure detected


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

AUTO

STBY

AIR COND

  • Loss of AC power to the controller

  • Excessive differential pressure

  • Excessive rate of cabin pressure change (± 1890 fpm)

  • High cabin altitude (above 13,875 feet)

  • The AUTO FAIL light illuminated indicates the automatic mode has failed

  • Illumination of the STBY light indicates the pressurization system has automatically changed to the standby mode


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

WING BODYOVERHEAT

AIR COND

  • The left WING-BODY OVERHEAT light illuminated, indicates a bleed air duct leak in the:

    • Left engine strut

    • Left wing leading edge

    • Left air conditioning bay

    • Keel beam, or the APU bleed duct

  • The right WING-BODY OVERHEAT light illuminated, indicates a bleed air duct leak in the:

    • Right engine strut

    • Right wing leading edge

    • Right air conditioning bay


Nitrogen generating system

ALTN

STBY

  • Digital system: pressurization system operating in the alternate automatic mode (ALTN)

  • Analog system: pressurization system operating in the standby mode (STBY)


Nitrogen generating system

MAN

  • Digital or analog system: pressurization system operating in the manual mode


Nitrogen generating system

RAM DOOR

  • Indicates ram door in full open position

  • In normal cruise, the doors modulate between open and closed

  • Apply the following performance penalties to account for increased drag associated with a ram inlet door or exhaust louver in the Flight Open/Full Open position:


Nitrogen generating system

A/P

P/RST

FMC

P/RST

  • Autopilot Disengage Light (A/P):

    • Flashing (red)

      • Autopilot has disengaged (tone sounds)

      • Reset by pushing either disengage light or either A/P disengage switch

    • Steady (red)

      • ALT ACQ mode inhibited during A/P go-around if stabilizer not trimmed for single A/P operation

      • Disengage light test switch held in position 2

      • Automatic ground system tests fail

    • Steady (amber)

      • Disengage light test switch held in position 1

  • FMC Alert Light

    • Steady (amber)

      • Test switch held in position 1 or 2

LEFT/RIGHT FORWARD PANEL


Nitrogen generating system

DISPLAYS CONTROL PANEL

  • Failure of the related EFIS control panel

  • Other indications include the altimeter blanking with an ALT flag on the side corresponding to the failed control panel


Nitrogen generating system

  • Captain’s and First Officer’s airspeed indications disagree by more than 5 knots for 5 continuous seconds

IAS

DISAGREE


Nitrogen generating system

  • Captain’s and First Officer’s altitude indications disagree by more than 200 feet for more than 5 seconds

ALT

DISAGREE


Nitrogen generating system

WIND

SHEAR

Picnic Table

Flight Path Symbol

-300/500

  • Windshear exists

  • The following conditions are indications of windshear encounters:

    • WINDSHEAR WARNING

    • Inadvertent windshear encounter or other situation resulting in unacceptable flightpath deviations

  • An unacceptable flightpath deviation is any uncontrolled change from normal steady state flight conditions during a takeoff or an approach, in excess of the following:

    • +/- 15 knots indicated airspeed

    • +/- 500 fpm vertical speed

    • +/- 5 degree pitch attitude

    • +/- 1 dot displacement from the glideslope

    • Unusual thrust lever position for a significant period of time

HGS 4000


Nitrogen generating system

ALT ALERT

  • Steady (acquisition alert):

    • Within 900 feet of MCP selected altitude, momentary tone sounds

    • At 300 feet from selected altitude, ALT ALERT annunciation is no longer displayed

  • Flashing (deviation alert):

    • Upon deviating from selected MCP altitude by more than 300 feet, momentary tone sounds

    • Flashing continues until:

      • Altitude deviation less than 300 feet

      • Altitude deviation more than 900 feet

      • New altitude selected

  • Altitude alerting is inhibited when:

    • Wing flaps are extended to 25 or greater

    • (–300/500) Wing flaps are extended past 15

    • When the glideslope is captured

ALTITUDE

ALERT

-300/500


Nitrogen generating system

CDS FAULT

  • One of the DEU’s has failed

  • Will illuminate on the ground only, prior to starting the second engine

  • The CDS FAULT and the CDS MAINT annunciations may or may not be deferrable, for dispatching requirements, refer to MEL 31

  • Compact Display:

    • The pilot loses the capability to display LNAV, TCAS traffic, Weather radar, and Terrain

    • Even if both pilots are limited to the compact display, all aural warnings would still function and TCAS resolutions would also be displayed


Nitrogen generating system

DISPLAY SOURCE

  • Only one DEU is supplying information to all six display units

  • Lack of hydraulic pressure information on the failed side

  • A speed limit flag visible on the failed side

  • The minimum maneuver speed and stick shaker band removed for the MASI on the failed side

  • Both EEC ALTN lights illuminated

  • Fails on the same side as the engaged autopilot

    • Flight director indications may blank and autopilot mode reversions may occur

  • Will revert to a CDS FAULT annunciation after engine shutdown on the ground


Nitrogen generating system

CDS MAINT

  • A CDS fault has occurred

  • Displayed on the ground only, prior to start of the second engine

  • The CDS FAULT and the CDS MAINT annunciations may or may not be deferrable, for dispatching requirements, refer to MEL 31


Nitrogen generating system

TAI

TAI

  • TAI:

    • The engine anti-ice switch is in the ON position and the anti-ice valve is open

  • TAI:

    • Cowl anti-ice valve is not in the position indicated by the related engine anti-ice switch

    • The engine anti-ice switch and the valve position do not agree for more than 8 seconds


Nitrogen generating system

1

X-BLD START

X-BLD START

  • Crossbleed air recommended for in-flight start

  • Airspeed is less than that required for a windmilling start

  • Crossbleed start should be used if N2 drops below 11% (-300/500: Starter assist should be used if N2 drops below 15%)

Annunciator

1


Nitrogen generating system

ENG FAIL

¹

ENG FAIL¹:

  • Engine N2 below sustainable idle (less than 50%); and

  • Engine start lever in IDLE position

    Alert remains until:

  • Engine N2 above sustainable idle (50% or greater); or

  • Engine start lever moved to CUTOFF; or

  • Engine fire warning switch pulled


Nitrogen generating system

START VALVE

OPEN

START VALVE

OPEN

-300/500

  • On the upper display unit indicates the start valve has opened or remained open after engine start (normal cutout is 56%)

  • (-300/500) The start valve has opened or remained open after engine start (normal cutout is 46%)

  • If the start switch does not automatically return to OFF, the auto starter cutout feature may have failed

  • For dispatching requirements, refer to MEL 80


Nitrogen generating system

REV

¹

REV

REVERSER UNLOCKED

-300/500

  • Thrust reverser is deployed (REV) ¹

  • Thrust reverser is moved from stowed position (REV) ¹

  • (-300/500) The REVERSER UNLOCKED light illuminated indicates that either of the two reverser sleeves has mechanically unlocked or that the REVERSER UNLOCKED light is giving a false indication

  • Only multiple failures could allow the engine to go into reverse thrust

  • Such failures may preclude returning the engine to forward thrust

  • Unstowed reverser sleeves produce buffet and increase aircraft drag, as well as noticeable yaw and roll


Nitrogen generating system

  • Indicates impending bypass of the oil filter

OIL FILTER

BYPASS

OIL FILTER

BYPASS

-300/500


Nitrogen generating system

LOW OIL PRESSURE

  • Indicates oil pressure at or below the redline (the needle on the oil pressure display on the upper display unit turns red)

  • Low oil pressure is also indicated by oil pressure in the amber band (-300/500 yellow band) with takeoff thrust set

LOW OIL PRESSURE

-300/500


Nitrogen generating system

1900

LOW

1700

LOW

1

  • 1 - Fuel Low Alert (LOW)

    • Fuel quantity less than 2000 lbs in related main tank

    • Fuel quantity arc and digitson tank(s) with low fuel quantity turn amber

    • Displayed until quantity is increased to 2500 lbs

  • 2 - Fuel Configuration Alert (CONFIG)

    • Center tank quantity greater than 1600 lbs, both center tank pumps are producing low or no pressure and either engine is running

    • Fuel quantity arc and digits on center tank turn amber

    • When illuminated, the indications will remain amber until center tank quantity is less than 800 lbs, one center tank pump is producing high pressure or both engines are not running

  • 3- Fuel Imbalance Alert (IMBAL)

    • Indicates main tanks differ by more than 1000 lbs

    • Displayed below tank with lower fuel quantity

    • Fuel quantity arc and digitson tank with lower fuel quantity turn amber

    • Inhibited when aircraft is on ground

    • Inhibited by fuel LOW indication when both conditions exist

    • Displayed until imbalance is reduced to 200 lbs

8500

CONFIG

2

5500

IMBAL

3


Nitrogen generating system

  • Hydraulic quantity below 76%

  • Valid only when aircraft is on ground with both engines shutdown or after landing with flaps up during taxi-in

70

RF


Nitrogen generating system

SPEEDBRAKES

EXTENDED

  • The SPEEDBRAKES EXTENDED light illuminated:

    • In-flight indicates:

      • The speedbrake lever is beyond the ARMED position and either the TEF’s are extended more than position 10, or

      • The radio altitude is less than 800 feet

    • If illuminated on the ground, it indicates:

      • The speedbrake lever is in the DOWN detent but the ground spoilers are not stowed


Nitrogen generating system

BELOW G/S P- INHIBIT

  • Aircraft exceeds glideslope deviation limits

    • Push:

      • Inhibits ground proximity glideslope alert when below 1000 feet RA

      • (-300/500) Inhibits or cancels below glide slope alerting if pushed when the aircraft is in the alerting area


Nitrogen generating system

AIII

RO

TO

NO AIII

RO CTN

TO CTN

HGSFAIL

FLARE

RO ARM

APCH

  • AIII:

    • Indicates the HGS is operating in the AIII mode and there are no AIII capability or approach monitor faults

    • It annunciates concurrently with the AIII mode annunciator on the combiner

    • The AIII mode must be used for an approach to Special CAT I, Special CAT II, or CAT IIIA minimum

  • NO AIII:

    • Indicates there was a loss of AIII capability above 500 feet AGL

    • “NO AIII” displays concurrently on the combiner

  • FLARE:

    • Indicates flare guidance is active in the AIII mode

    • It annunciates when the flare guidance symbol “+” displays on the combiner

  • RO:

    • Indicates the rollout mode is active

    • “RO” displays concurrently on the combiner

  • RO CTN:

    • Indicates a loss of rollout guidance capability below 500 feet AGL

    • “RO CTN” displays concurrently on the combiner

  • RO ARM:

    • Indicates the HGS is capable of providing rollout guidance and rollout

    • Guidance is armed for automatic activation at touchdown

  • APCH WARN:

    • Indicates an approach warning has occurred

    • APCH WARN flashes for 5 seconds, then remains on steady

    • “NO AIII” and “APCH WARN” displays concurrently on the combiner

    • An approach warning occurs below 500 feet AGL if an AIII capability fault occurs or the HGS approach monitor detects an out of tolerance approach

  • HGS FAIL:

    • Indicates a HGS computer communication failure to the HAP during an AIII approach below 500 feet AGL

    • When the HGS FAIL button annunciates, all other annunciators are blanked

    • To turn off the annunciator light, push the HGS FAIL button

TO WARN

FO’s INSTRUMENT PANEL

HGS 4000 Digital HAP


Nitrogen generating system

AIII

APCHWARN

  • AIII Mode (AIII) Annunciator (green):

    • Indicates the HGS is operating in the AIII mode and there are no AIII capability or approach monitor faults

    • It annunciates concurrently with the AIII mode annunciator on the combiner

    • The AIII mode must be used for an approach to Special CAT I, Special CAT II, or CAT IIIA minimum

  • Approach Warning (APCH WARN) Annunciator (red)

    • Indicates an approach warning has occurred

    • “NO AIII” and “APCH WARN” concurrently display on the combiner

    • An approach warning occurs below 500 feet AGL if an AIII capability fault occurs or the HGS approach monitor detects an out of tolerance approach

  • Flare Guidance (FLARE) Annunciator (green)

    • Indicates flare guidance is active in the AIII mode

    • It annunciates when the flare guidance symbol “+” displays on the combiner

FLARE

FO’s INSTRUMENT PANEL

(HGS 2350-700 and 2300-300/500)

Three-panel HAP


Nitrogen generating system

INOP

GPWS

  • GPWS computer malfunction or power loss

  • Invalid inputs are being received from radio altimeter, ADC, ILS receiver, IRS, FMC, stall management computers (-300/500 stall warning system), or EFIS control panel

  • Some or all GPWS alerts are not available

  • GPWS alerts that occur are valid


Nitrogen generating system

PULL UP

-300/500

  • Indicates one or more of the following exist:

    • Excessive descent rate

    • Excessive terrain closure rate

    • Altitude loss after takeoff or go-around

    • Unsafe terrain clearance when not in the landing configuration


Nitrogen generating system

SPEEDBRAKE

DO NOT ARM

  • The SPEEDBRAKE DO NOT ARM light illuminated indicates:

    • Flaps up: A fault has been detected which may result in a failure of the speedbrake wing load alleviation system

      • The speedbrake wing load alleviation system has failed,

        therefore, airspeed must be limited to 320 knots.

    • Flaps not up (one of the following has occurred):

      • Failure of the auto speedbrake system self test or auto speedbrake system which will result in failure of the speedbrake to automatically deploy upon landing

      • Failure of the speedbrake wing load alleviation system to deactivate which may result in limited auto speedbrake deployment upon landing, must be manually overridden


Nitrogen generating system

STABOUT OF TRIM

  • The STAB OUT OF TRIM light illuminated, with the autopilot engaged, indicates that the autopilot is not trimming the stabilizer properly

  • Momentary illumination of the STAB OUT OF TRIM light during large changes in trim requirements is normal


Nitrogen generating system

SPEEDBRAKE ARMED

  • Indicates valid automatic speedbrake system inputs

  • Deactivated when speedbrake lever is in the DOWN position


Nitrogen generating system

LE FLAPS TRANSIT

  • During Takeoff, Go-Around Or Cruise:

    • The LE FLAPS TRANSIT light illuminated indicates one or more leading edge device is not retracted when commanded by the flap lever, or

    • A possible leading edge device indication problem

  • During Configuration For Landing:

    • The LE FLAPS TRANSIT light illuminated indicates that the leading edge devices have extended asymmetrically or have failed to move to the full extend position as appropriate

    • The overhead annunciator panel should be checked to confirm the actual leading edge device status

QRH H-19


Nitrogen generating system

LE FLAPS TRANSIT

  • Any LE device in transit

  • Any LE device not in programmed position with respect to TE flaps

  • A LE slat skew condition exists, slats 2 through 7 only (-300/500 N/A)

  • During alternate flap extension, until the TE flaps approach the flaps 10 position

  • Light is inhibited during autoslat operation in-flight

FRM


Nitrogen generating system

LE FLAPS EXT

  • All leading edge flaps extended and all leading edge slats in extended (intermediate) position (trailing edge flap positions 1, 2, and 5)

  • All leading edge devices fully extended (trailing edge flap positions 10 through 40)


Nitrogen generating system

AUTO BRAKE DISARM

  • The AUTO BRAKE DISARM light illuminated indicates the auto brake system has disconnected after being set

  • SPEED BRAKE lever moved to down detent during RTO or landing

  • Manual brakes applied during RTO or landing

  • Thrust lever(s) advanced during RTO or landing (except during first 3 seconds after touchdown for landing)

  • Landing made with RTO selected

  • RTO mode selected on ground

    • Illuminates for 1 to 2 seconds, then extinguishes (bit check)

  • A malfunction exists in automatic braking system


Nitrogen generating system

ANTISKID INOP

  • System fault is detected by the anti-skid monitoring system

    • Takeoff with the anti-skid inoperative is only allowed on runways designated as dry (-300/500 N/A)

    • BUR, MDW, and SNA will not be used as alternates if the antiskid is inoperative

    • Performance numbers will be checked before listing any airport as an alternate on a release with MEL performance issues

  • An anti-skid light on with parking brakes set indicates a problem in the parking brake system


Nitrogen generating system

NOSEGEAR

NOSEGEAR

  • Landing gear is not down and locked

    • With either or both forward thrust levers retarded to idle, and

    • (-700) Below 800 feet AGL

  • Related landing gear is in disagreement with LANDING GEAR lever position

    • In transit or unsafe

LEFTGEAR

RIGHTGEAR

LEFTGEAR

RIGHTGEAR

CENTER PANEL


Nitrogen generating system

NOSEGEAR

NOSEGEAR

  • Related gear is down and locked

    • Landing gear warning horn is deactivated with all gear down and locked

    • Landing gear is down and locked as long as one green landing gear indicator light (center panel or overhead panel) for each gear is illuminated

LEFTGEAR

RIGHTGEAR

LEFTGEAR

RIGHTGEAR

CENTER PANEL


Nitrogen generating system

NOSEGEAR

NOSEGEAR

  • Top Light

    • Landing gear is up and locked with LANDING GEAR lever UP or OFF

    • Landing gear is down and locked with LANDING GEAR lever DOWN

  • Bottom Light

    • Landing gear is not down and locked

LEFTGEAR

RIGHTGEAR

LEFTGEAR

RIGHTGEAR

CENTER PANEL


Nitrogen generating system

FIRE

WARN

BELL CUTOUT

FIRE

WARN

BELL CUTOUT

  • Wheel well fire

  • Brakes alone cannot generate enough heat to activate the fire detection system

WHEEL

WELL

Fire Panel


Nitrogen generating system

FIRE

WARN

BELL CUTOUT

FIRE

WARN

BELL CUTOUT

  • APU fire

  • Automatic shutdown of the APU

  • Unlocks the APU fire warning switch

  • Anytime the APU fire warning light extinguishes, position the test switch to FIRE/OVHT to test the integrity of the APU fire detection circuitry

  • Pulling the APU fire switch up:

    • Arms the APU extinguisher circuit

    • Allows the APU fire warning switch to rotate

    • Closes the APU fuel and bleed air shutoff valves

    • Closes the inlet door

    • Trips the generator control relay and breaker

DISCH

A

P

U

Fire Panel


Nitrogen generating system

FIRE

WARN

BELL CUTOUT

MASTERCAUTION

PUSH TO RESET

MASTERCAUTION

PUSH TO RESET

FIRE

WARN

BELL CUTOUT

OVHT/DET

  • Engine fire

  • Pulling the engine fire warning switch up:

    • Shuts down the engine

    • Arms one discharge squib on each engine fire extinguisher

    • Closes the fuel and hydraulic shutoff valves

      • Pulling the engine fire switch closes both the fuel shutoff valve and the spar shutoff valve

    • Closes the engine bleed air valve

    • Disables the thrust reverser

    • Trips the generator control relay and breaker

    • Deactivates the engine driven hydraulic pump low pressure light

DISCH

DISCH

1

2

ENG 1

OVERHEAT

ENG 2

OVERHEAT

Fire Panel


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

ENG 1

OVERHEAT

ENG 2

OVERHEAT

OR

OVHT/DET

  • Indicates an overheat condition in the related engine

  • May be accompanied by vibration or abnormal engine indications

  • Unlocks the related engine fire warning switch


Nitrogen generating system

FAULT

FIRE PANEL

  • At any time other than a system test, indicates both fire/overheat loops on an engine have failed

    • The FAULT light does not cause the MASTER CAUTION light to illuminate

  • An actual dual loop failure in either engine is not deferrable


Nitrogen generating system

MASTERCAUTION

PUSH TO RESET

APU DET INOP

OVHT/DET

  • APU fire detection loop has failed


Nitrogen generating system

APU BOTTLE DISCHARGE

  • APU extinguisher bottle has discharged

FIRE PANEL


Nitrogen generating system

L BOTTLE DISCHARGE

R BOTTLE DISCHARGE

  • Related fire extinguisher bottle has discharged

FIRE PANEL


Nitrogen generating system

ARM

Fire

Warning

Bell Cutout

FWD

AFT

Fire

Warning

Bell Cutout

-700 CENTER CONSOLE

Fire

Warning

Bell Cutout

Fire

Warning

Bell Cutout

____FWD____ ____AFT____

FIRE

FIRE

FWD FIRE

AFT FIRE

-300/500 OVERHEAD PANEL

  • A cargo bay fire warning is annunciated if at least one detector in each loop (A & B) detect smoke

  • If power is failed in one loop (A or B) and at least one detector in the remaining loop detects smoke

  • The forward and aft cargo compartments have photo-electric smoke detectors

  • The forward cargo compartment has four detectors mounted in the ceiling, while the aft has six

  • The smoke detectors in each cargo bay normally operate in a dual loop configuration in that both loops

  • must sense smoke to alert

  • There is only one fire bottle on the -700 system

  • (-300/500) A cargo bay fire warning is annunciated if two smoke detectors in a cargo bay detect smoke,

  • or if one smoke detector detects both smoke and excessive temperature

  • There are two fire bottles on the -300/500 system


Nitrogen generating system

Fire

Warning

Bell Cutout

FWD

DISCH

Fire

Warning

Bell Cutout

ARMED

  • The extinguisher is armed by pushing the appropriate cargo fire arming switch (ARMED)

    • Once armed, the system is discharged by pushing the cargo fire DISCH switch

  • The DISCH light may require up to 30 seconds to illuminate amber, indicating the total discharge of the bottle contents into the selected compartment

  • With the fire extinguished the fire warning light may remain illuminated due to the detection of residual smoke, or Halon

  • Aircraft must land within 60 minutes of initial discharge of the fire suppression system

-700 CENTER CONSOLE


Nitrogen generating system

EXT

FWD

AFT

  • The indications for a cargo bay fire test

Fire

Warning

Bell Cutout

FWD

AFT

Fire

Warning

Bell Cutout

-700 CENTER CONSOLE


Nitrogen generating system

DETECTOR FAULT

  • When testing:

    • If any detector in the selected loops fail to respond to the test

    • At the end of the test a four second delay allows the system to reset before it will alert that there is a fire

  • At any time other than a system test:

    • Both loops in one or both cargo bays have failed

    • Fire detection system in one or both cargo bays is inoperative

CARGO BAY CDU


Nitrogen generating system

ATC

  • Transponder Fail Light (ATC FAIL)

    • Indicates transponder malfunction

FAIL

TRANSPONDER PANEL


Nitrogen generating system

LOCK

FAIL

  • With the flight deck door selector in AUTO:

    • Door lock has failed

    • Flight deck access system switch is OFF


Nitrogen generating system

AUTO

UNLK

  • The correct emergency access code has been entered into the keypad

  • AUTO UNLK light flashes and a continuous chime sounds during a 30-second delay before the door unlocks for 5 seconds and then relocks

    • Outside keypad LED goes from amber to green


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