EGPWS LINE MAINTENANCE MANUAL
3.8.20 AOA VALIDITY DISCRETES (MK V AND MK VII ONLY)
Two AOA validity discretes may be used by EGPWS, one for each source of AOA. Input will come from either an AOA Indication System or a Stall Warning Computer, depending on the type being used by the aircraft.
Type: | Fail Flag from AOA Indication System or a Stall Warning Computer | ||||
Signal Status: | Fail or Not Fail |
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| Level 6 Audio readout | ||
AOA Validity Discrete #1 |
| Valid => | “AOA 1 | Valid” | |
| Invalid => | “AOA 1 | Invalid” | ||
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AOA Validity Discrete #2 |
| Valid => | “AOA 2 | Valid” | |
| Invalid => | “AOA 2 | Invalid” | ||
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3.8.21 DISPLAY SELECT DISCRETES
Type: Supplied by momentarily actuated cockpit manual switch. Two types are supported:
Type 1: momentary make/break switch
Type 2: toggle type switch
Signal Status: Terrain Awareness Display (TAD) activated if not active or TAD canceled if currently active.
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| Level 6 Audio readout |
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Display Select Discrete #1 |
| True => | “Display Discrete 1 True” | |
| False => | “Display Discrete 1 | False” | |
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Display Select Discrete #2 |
| True => | “Display Discrete 2 | True” |
| False => | “Display Discrete 2 | False” | |
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3.8.22 TERRAIN AWARENESS & TCF INHIBIT
Type: Switch for inhibit of Terrain Awareness & TCF functions
Signal Status: Terrain Awareness & TCF Inhibit or Not Inhibit
“Terrain Inhibited” will be enunciated during cockpit
Fault monitoring: For some installations, activation of this input for more than 5 seconds will activate the Terrain
Monitor (refer to the Terrain Display Configuration Data table for each aircraft type).
Level 6 Audio readout
Terrain Awareness & TCF Inhibit
Disabled => | “Terrain Off” |
Normal => | “Terrain On” |
3.8.23 SIMULATOR REPOSITION (MK V AND MK VII ONLY)
Type: | Switch for activating Simulator Reposition |
Signal Status: | Reposition or Normal |
If the Simulator Reposition program pin option is activated, then this discrete can be used to ‘preset’ the EGPWS to match simulator initial conditions.
Level 6 Audio readout
Simulator Reposition Discrete
Reposition => | “Simulator Reposition On” |
Normal => | “Simulator Reposition Off” |
CAGE CODE: 97896 | SCALE: NONE SIZE: A DWG NO.: | REV: G | SHEET 44 of 68 |
