Honeywell MK VIII, MK XXII manual Egpws Line Maintenance Manual, Fault, Reason

EGPWS LINE MAINTENANCE MANUAL

TABLE 3-3: CURRENT FAULTS - EXTERNAL (EXAMPLES)

FAULT

EXAMPLE

REASON

ARINC 429 Bus Fault	GPS BUS 1 INACTIVE
ARINC 429 Signal	ILS BUS 1 GLIDESLOPE FAULT FW
Fault
ARINC 429 Signal	ILS BUS 1 GLIDESLOPE FAULT UPD
Fault
Analog Signal Fault	RADIO ALTIMETER 1 WIRING
	FAULT
	AOA UNREASONABLE FAULT
Discrete Input Faults	FLAP SWITCH FAULT
	GEAR SWITCH FAULT
	AUDIO CANCEL INVALID
	TERRAIN INHIBIT INVALID
	GPWS INHIBIT INVALID
	ALL MODES INHIBIT INVALID

GLIDESLOPE CANCEL INVALID

ILS SELECT INVALID

FLAP ANGLE UNREASONABLE

RANGE UNREASONABLE

SELF-TEST INVALID

AIR GROUND INVALID

MOMENTARY TERRAIN

SELECT 1 (or 2) INVALID

No expected input labels received for more than 4 seconds

The SSM of the input data indicates Failure/Warning

Note: Only the RS232 present Status will report the ‘FW” part of the fault.

The input label is not meeting the required update rate.

Note: Only the RS232 present Status will report the ‘UPD” part of the fault.

Open wire monitoring has detected no connection.

AOA is not within 4 degrees of waterline during takeoff roll (60-90 knots). Incorrect Aircraft Configuration or AOA potentiometer is Worn.

Indicates Landing Flaps for > 60 seconds with an airspeed > 250 knots, or indicates Not Landing Flaps for more than 2 seconds with “Too Low Flaps” message below 100 feet. Indicates Landing Gear for > 60 seconds with an airspeed > 290 knots, or indicates Not Landing Gear for more than 2 seconds with “Too Low Gear” message below 100 feet. Discrete selected for > 30 seconds.

Discrete selected for > 60 seconds. Discrete selected for > 60 seconds. Discrete configured to suppress both audio and visual outputs and selected for > 60 seconds.

Or if aircraft type is configured for ‘Audio Inhibit Monitoring’ then activation for > 60 seconds to inhibit only audio will cause this fault.

Discrete selected for > 15 seconds. More than 1 discrete selected for > 5 seconds.

Invalid combination selected for > 30 seconds.

No valid range provided for > 5 seconds. Discrete selected for > 60 seconds.

Indicates On-Ground for > 60 seconds with an airspeed > 290 knots.

Selected for > 15 seconds.

CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 28 of 68