EGPWS LINE MAINTENANCE MANUAL

3.8.1 ARINC 552 / ALT 55 RADIO ALTITUDE VALIDITY FLAG DISCRETES

Three Radio Altitude validity flags may be used by the EGPWS, one for each of the three possible ARINC 552 or ALT 55 Radio Altimeters inputs.

Type

Validity from ARINC 552 or ALT 55 Radio Altimeter.

Signal Status: Valid or Invalid

 

 

 

 

 

 

 

 

 

 

Level 6 Audio readout

Radio Altitude Validity Discrete #1

 

Valid =>

“Radio Altimeter 1 Valid”

 

Invalid =>

“Radio Altimeter 1 Invalid”

 

 

 

Radio Altitude Validity Discrete #2

 

Valid =>

“Radio Altimeter 2 Valid”

 

Invalid =>

“Radio Altimeter 2 Invalid”

 

 

 

Radio Altitude Validity Discrete #3

 

Valid =>

“Radio Altimeter 3 Valid”

 

Invalid =>

“Radio Altimeter 3 Invalid”

 

 

 

3.8.2 GND LANDING GEAR DISCRETE

Type

Supplied by landing gear or landing gear selector handle position-sensitive switch. This input can

 

be paralleled with, or used exclusively by a Gear Override Switch if an alternate source of Gear

 

Position is used.

Signal Status:

Landing Gear Down or Landing Gear Up

Fault monitoring: Indication of landing gear selected for more than 60 seconds at airspeeds above 290 knots will result in a gear switch fault which will cause a GPWS INOP indication.

Note: This can be caused either by a gear switch fault or by the Gear Override switch being left in the on position.

Level 6 Audio readout

Landing Gear Discrete

Selected =>

“Landing Gear Down”

or Gear Override

Not Selected =>

“Landing Gear Up”

3.8.3 +28V LANDING GEAR DISCRETE

Type

Supplied by landing gear or landing gear selector handle position-sensitive switch. This input can

 

be paralleled with, or used exclusively by a Gear Override Switch if an alternate source of Gear

 

Position is used.

Signal Status:

Landing Gear Down or Landing Gear Up

Fault monitoring: Indication of landing gear selected for more than 60 seconds at airspeeds above 290 knots will result in a gear switch fault which will cause a GPWS INOP indication.

Note: This can be caused either by a gear switch fault or by the Gear Override switch being left in the on position.

 

Level 6 Audio readout

+28 V Landing Gear Discrete

Selected =>

“28V Landing Gear Down”

or Gear Override

Not Selected =>

“28V Landing Gear Up”

CAGE CODE: 97896

SCALE: NONE SIZE: A DWG NO.: 060-4199-180

REV: G

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Honeywell MK VIII, MK XXII manual Arinc 552 / ALT 55 Radio Altitude Validity Flag Discretes, GND Landing Gear Discrete

MK VIII, MK V, MK XXII, MK VII, MK VI specifications

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