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B737 GPS/FMS. Part 8: GPS Warning and Messages. Topics Warning Devices MCDU Annunciator Bank HSI Warning and Annunciations. The B737 installation provides a number of devices that provide warning and annunciations to pilots when the GPS/FMS is not working properly.

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b737 gps fms

B737 GPS/FMS

Part 8: GPS Warning and Messages

slide2
Topics
  • Warning Devices
    • MCDU
    • Annunciator Bank
    • HSI
  • Warning and Annunciations
slide3

The B737 installation provides a number of devices that provide warning and annunciations to pilots when the GPS/FMS is not working properly.

The CMA 900 has two sections that are the primary reference for FMS failures in conjunction with the SOP’s. These are:

Section 12 - Abnormal Procedures

Section 15 - System Messages and Remote Annunciations

slide4

MCDU

The MCDU provides warnings and alerts via a number of different methods.

The annunciator bank along the top of the MCDU incorporates a number of annunciations.

slide5

MCDU Annunciators

POS

Annunciator: illuminates when the aircraft’s navigation is in dead reckoning

OFST

Annunciator: illuminates during offset (parallel) track navigation

FAIL

MSG

POS

OFST

IND

ATC

MSG

Annunciator: illuminates when a caution or warning alert message appears in the scratchpad field of the MCDU display

IND

Annunciator: illuminates when the FMS is operating in independent mode

FAIL

Annunciator: illuminates at maximum with the display upon detection of a major MCDU failure

ATC

Annunciator: illuminates to indicate the reception of Air Traffic Control message (when implemented)

slide6

MSG Annunciations are amplified with an explanation in the scratch pad

The scratchpad provides a detailed explanation of the source of the annunciation

A description of the scratchpad message is provided in Section 15 of the CMA-900 Operator’s Manual

slide7

Scratch pad annunciations can be cleared with the CLR key

Scratch pad annunciations can also be recalled by using INIT/REF then MSG RECALL <LSK 6R>

slide8

The annunciator bank

Located beneath the RMI’s, the annunciator bank serves a number of roles:

  • it acts as a repeater of MCDU annunciations (OFFSET, MSG, GPS INT)
  • it provides information regarding the status of flight (OFFSET, VERT, WPT, APPR CAP)
slide9

The MSG on the MCDU is repeated on the Annunciator Bank

Refer to the CMA-900 FMS Operator’s Manual, Section 15, for appropriate pilot actions to be accomplished in response to displayed messages on the MCDU.

Some of the FMS messages describe malfunctions or degradation of GPS capability. IFR GPS operations must be discontinued upon display of such messages.

MSG

MCDU MESSAGE

slide10

OFST

The OFST on the MCDU is repeated on the Annunciator Bank indicating that the FMS is operating on a parallel offset track

slide11

If a GPS INT annunciator appears with an FMS Message of “GPS POS UNCERTAIN”

MSG

During an IFR GPS Approach:

Terminate IFR approach and either use traditional navigation aids to continue the approach or execute a missed approach, if required.

GPS POS UNCERTAIN

Note: in synchronized mode of operation, the GPS INT annunciator illuminates if GPS integrity is lost on all GPS sensors

slide12

If a GPS INT annunciator appears with an FMS Message of “GPS POS UNCERTAIN”

MSG

During an IFR Enroute/Terminal:

Continue to navigate using the CMA-900 FMS or revert to an alternate means of navigation appropriate to route and phase of flight. When continuing to use GPS navigation, position must be verified every 15 minutes using other IFR approved navigation systems.

GPS POS UNCERTAIN

Note: in synchronized mode of operation, the GPS INT annunciator illuminates if GPS integrity is lost on all GPS sensors

slide13

If a GPS INT annunciator appears with an FMS Message of “GPS NAV LOST”

MSG

During an IFR GPS Approach:

Terminate IFR approach and either use traditional navigation aids to continue the approach or execute a missed approach, if required.

GPS NAV LOST

Note: in synchronized mode of operation, the GPS INT annunciator illuminates if GPS integrity is lost on all GPS sensors

slide14

If a GPS INT annunciator appears with an FMS Message of “GPS NAV LOST”

MSG

During an IFR Enroute/Terminal:

Revert to an alternate means of navigation appropriate to route and phase of flight.

GPS NAV LOST

Note: in synchronized mode of operation, the GPS INT annunciator illuminates if GPS integrity is lost on all GPS sensors

slide15

POS

Dead Reckoning Mode

“POS” ANNUNCIATOR ILLUMINATES ON MCDUs

Refer to CMA-900 FMS Operator’s Manual Section 12 for Dead Reckoning mode operational procedures.

slide16

HSI SOURCE SELECT SWITCH FAILS TO INDICATE "FMS" OR "VOR/LOC”

Verify navigation source displayed on HSI.

Continue operation in accordance with navigation source displayed on HSI.

slide17

Loss of FMS Annunciation

ALL FMS ANNUNCIATORS FAIL TO ILLUMINATE

Discontinue IFR GPS operations.

slide18

If the VOR/LOC flag appears on the HSI during FMS operations:

Use the HSI Source Select Switch to return the navigation mode to VHF Nav

V

O

R

L

O

C

Confirm that VHF nav data is being provided to the HSI and continue flight using the remaining operational navigation equipment appropriate for the phase of flight