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King Air Ground School. 26 - Fire Protection. Overview. Engine Fire Detection, IR Detection System Not on E90 Engine Fire Extinguishing – Halon based fire extinguishing Not on U21 or E90 Portable Extinguisher – at least one halon in the cockpit Overheat protection for Bleed air

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King Air Ground School

26 - Fire Protection


Overview

Engine Fire Detection, IR Detection System

Not on E90

Engine Fire Extinguishing – Halon based fire extinguishing

Not on U21 or E90

Portable Extinguisher – at least one halon in the cockpit

Overheat protection for Bleed air

Emergency Portable Breathing Devices



Sensors / Detectors

Infrared photocells


Sensors / Detectors

3 Sensors in each engine compartment

Each sensor looking at a different zone in the engine compartment

1-forward of intake

2-upper accessory case

3-lower accessory case

Zone 1

Zone 3

Zone 2


Amplifier-Controller

Amplifier-Controller translates sensor detection to cockpit annunciations

Amplifier-Controller allows for testing the system

Illustration shows the relationship between sensor/detector and amplifier-controller

L Engine Fire Detected

No fire detected


Annunciators

U21A “LH/RH FIRE WARNING” and “FAULT WARN”

U21H “FIRE L/R ENG” and “MASTER WARNING”

U21H

U21A


Annunciators

C12 T-handle – “#1/2 FIRE PULL” and “MASTER WARNING”

200 “FIRE L/R ENG” and “L/R ENG FIRE-PUSH TO EXT” and “MASTER WARNING”

C12

200


Test Switch

U21 – 8 position switch “Test Switch Fire Detection”

C12 – 6 position switch “Fire Protection Test”

200 – 7 position switch “Test Switch Fire Det & Fire Ext”

Only turn counter clockwise unless the test fails

U21

200

C12


Electrical

Circuit Breaker in Cockpit – with CB pulled, detection won’t work

Dual-fed bus – power must be on the aircraft in order to detect

200

U21

C12



Test

The three DET/DETR positions of the test switch

Position 1 tests the fwd intake sensor of both engines

Position 2 tests upper accessary case sensor of both engines

Position 3 tests lower accessory case sensor of both engines

Position 1

Position 3

Position 2


Test

Sensors are tested by increasing the output voltage of each sensor


Test

U21A and U21H

Both “LH/RH FIRE WARNING” / “FIRE L/R ENG” annunciators illuminate

“FAULT WARN” / “MASTER WARNING” is triggered

Audible warning horn

U21A

U21H


Test

C12

Both T-handle “#1/2 FIRE PULL” annunciators illuminate

“MASTER WARNING” is triggered

C12


Test

200

Both “FIRE L/R ENG” annunciators illuminate

“MASTER WARNING” is triggered

“L/R ENG FIRE PUSH TO EXT” light on both sides

200


Fire Indication

An actual fire has the same indications but will only be on the side of the fire

U21A

U21H

200

C12


Referenced Procedures

Engine Fire/Failure/Severe Damage

Evacuation/Engine Fire on the Ground

U21

C12




Toxicity

Not highly toxic but does cause issues in high concentrations (>10%)

Typical side effects include giddiness and tingling of extremities

Same chemical family as Freon

No extinguishing area


Aviation Uses

1301 used commonly for engine extinguishing

1211 or blend commonly used for portable fire extinguishers

Portable

Engine Extinguishing


Extinguishes Fire By:

Chemically combining with atoms which are propagating the fire, preventing combustion reaction (primary)

Displaces oxygen (secondary)

Cools the fire (secondary)



Fire Extinguishing Bottle

One bottle per engine

Discharges through plumbing to nozzles into fire zones


Fire Extinguishing Bottle

Pressure provides the motive flow for the halon

Fully discharges in .08 seconds

Zone 2&3 nozzles

Zone 1 nozzles


Pressure Gauges

Pressure indicates quantity of halon available

Gauge visible from the wheel well

Ambient temperature determines the pressure limits

Aft

Looking up, LH Main


Squibs

Pyrotechnic squib cartridge holds plug in place

“firing” the squib releases the plug

Halon flows to the discharge nozzles


Annunciations

C12

Red “PUSH TO EXTINGUISH” indicates squib is armed

Indicates squib has discharged


Annunciations

200

Indicates a fire is detected

Indicates squib has discharged


Actuation

C12

Pull appropriate T-Handle

Lift clear cover

Push the annunciator to discharge the bottle

Only fires the bottle that has been armed by the T-Handle


Actuation

200

Lift clear cover

Push the appropriate annunciator to discharge the bottle

One switch per side


Test Switch

Two remaining positions of the rotary test switch

200

C12


Electrical

Hot battery bus – bottles can be discharged with the batt master off



Test

EXTGH portion of rotary switch

Tests the circuitry to the squib and discharge light

C12 “#1/2 EXTGH DISCH” and “SQUIB OK”

C12 #1 & 2


Test

EXTGH portion of rotary switch

Tests the circuitry to the squib and discharge light

200 “D” and “OK”

200


Push to Extinguish

Pull T-Handle

Lift clear cover

Press the “PUSH TO EXTINGUISH” button

Look for “#1/2 EXTGH DISCH” annunciator

C12 LH extinguish


Push to Extinguish

Lift clear cover

Press the “L/R ENG FIRE PUSH TO EXT” button

Look for “D” annunciator

200 LH extinguish



Bleed Air Supply Line

Hot bleed air from engine is delivered to cabin

P3 air leaves the engine at 640⁰F

A broken line threatens smoke and fire


Heat Sense Line

Pressurized, plastic line runs along side bleed air lines

18psi originates at pneumatic controller

At 204⁰F the plastic line melts


Pressure Switch (C12/200)

One for the LH and RH sense lines

Below 18psi, this switch closes to warn the pilot

Pressure switch located under

co-pilot seat


Pressure Switch (U21)

There are two pressure switches one for each side located just before the check valves.


Annunciator Light (C12/200)

“L/R BL AIR FAIL” and “MASTER WARNING”

The pressure switches illuminate these annunciators respectively

200

C12


Annunciator Light (U21)

“LH/ RH BLD AIR FAIL” and “MASTER WARNING”

U21 A

U21 H



Bleed Air Line Rupture C12/200

The hot air melts the sense line (and anything else around it)

The low volume pressure in the sense line escapes

Pressure switch closes at18psi

“L/R BL AIR FAIL” annunciator Illumes with “MASTER WARNING”

A loss of pressure in the sense line indicates a serious threat

200

C12


Bleed Air Line Rupture U21

If a break in the bleed air line should occur the air pressure in the line would drop causing the pressure switch to open and the “LH or RH BLD AIR FAIL” to illume.



Duct Overtemp Protection: Components


Temperature Switch

Senses air temperature

U21

Between FO rudder peddles

C12/200

RH Mid cabin


Annunciator

“DUCT OVERTEMP”

C12

U21A

U21H

200


Duct Overtemp Protection: Operation


Air Temp in Duct Rises

Air in the ducting becomes too hot (potential for smoke)

Temperature switch closes circuit (225°F -300°F)

“DUCT OVERTEMP” annunciator illumes

C12

U21A

U21H

200




Halon 1211-1301 blend (2:1)

Located under pilot seat and an optional second one could be mounted in the cabin



PBE Part 25

Part 25 required

Fixed (stationary, or built in) protective breathing equipment must be installed for the use of the flightcrew, and at least one portable protective breathing equipment shall be located at or near the flight deck for use by a flight crewmember. In addition, portable protective breathing equipment must be installed for the use of appropriate crewmembers for fighting fires in compartments accessible in flight other than the flight deck.


EPOS Components

EPOS - Model MR-10096AF


1. OPEN CLOSURE FLAP OF STOWAGE POUCH.

2. GRASP STOWAGE POUCH W/ ONE HAND AND WITH OTHER HAND PULL RED TAPE STRIP OF BARRIER POUCH.

EPOS Operation

3. REMOVE THE EPOS UNIT FROM BOTH POUCHES.

4. PULL THE RED BALL WITH ONE HAND WHILE HOLDING THE OXYGEN CYLINDER WITH THE OTHER HAND.


5. SPREAD NECK SEAL OPEN WITH HANDS. PALMS ARE TO BE FACING EACH OTHER.

6. PULL THE EPOS OVER THE HEAD.

EPOS Operation

7. REMOVE HOOD AFTER YOU ARE CLEAR OF HAZARD



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