Honeywell MK VIII, MK XXII manual Egpws Line Maintenance Manual, “ BUS Inactive”

EGPWS LINE MAINTENANCE MANUAL

TABLE 3-4: LEVEL 2 SELF-TEST - EXTERNAL FAULTS

THE FOLLOWING EXTERNAL FAULTS ARE AVAILABLE IN LEVEL 2 SELF-TEST:

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Probable Cause:

Action:

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Probable Cause:

Action:

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Example:

Probable Cause:

Action:

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Probable Cause:

Action:

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Probable Cause:

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Probable Cause:

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“<BUS> Inactive”

GPS BUS 1 Inactive

Input source not powered or a wiring problem exists between source LRU and the

EGPWC.

Verify input source LRU is powered. Verify wiring from the source LRU. Verify program pin configuration.

“<BUS><SIGNAL> FAULT”

ILS BUS 1 GLIDESLOPE FAULT

Input signal SSM = Fail Warning, or Input signal is not being transmitted (incorrect update rate).

Repair input signal.

“<SIGNAL> FAULT ESE” (See Table 3-5 for other failure codes)

External signal is outside reasonable limits

Verify signal scaling

“<BUS> WIRING FAULT”

RADIO ALTIMETER 1 WIRING FAULT

Open wire monitor has detected no connection from the source LRU. Verify wiring from the source LRU.

“FLAP SWITCH FAULT”

Electrical short at the flap discrete input.

Verify wiring from the flap override switch and/or flap input discretes.

“GEAR SWITCH FAULT”

Electrical short at the gear discrete input.

Verify wiring from the gear override switch and/or gear input discrete.

“AUDIO CANCEL INVALID”

Electrical short at the audio cancel input.

Verify wiring from the audio cancel switch.

“ALL MODES INHIBIT INVALID”

Electrical short at the audio cancel input.

Verify wiring from the audio cancel input.

“GLIDESLOPE CANCEL INVALID”

Electrical short at the glideslope cancel input.

Verify wiring from the glideslope cancel input.

“ILS SELECT INVALID”

Electrical short at the ILS Select inputs.

Verify wiring from the ILS Select switches.

“FLAP ANGLE UNREASONABLE”

Electrical short at the flap discrete input(s).

Verify wiring from the flap-input discrete(s).

CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 29 of 68