3.8.19 +28 V AUDIO SUPPRESS(INHIBIT)/ALL MODES INHIBIT DISCRETE
The function of this discrete is controlled by program pin. This discrete always inhibits all audio except for the Windshear warning. If configured to suppress visual the input will also suppress all visuals except for Windshear warning. If configured to also suppress visuals, activation of this input for more than 60 seconds will always result in
the ‘All Modes Inhibit” fault which will cause GPWS and Terrain INOP indications. As a function of selected aircraft type this discrete can also cause the All Modes Inhibit fault after 60 seconds even if it is only configured to suppress audio.
Type: Analog discrete input from a flight deck mounted switch
Signal Status: Audio Suppress enabled or disabled/All Modes Inhibit enable or disable
Level 6 Audio readout GPWS Inhibit => “28V Audio Inhibit” +28V Audio Inhibit Discrete Not Inhibit => “28V Audio Not Inhibit”
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. Either from 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
Level 6 Audio readout
AOA Validity Discrete #1 Valid => Invalid => “AOA 1 Valid” “AOA 1 Invalid”
AOA Validity Discrete #2 Valid => Invalid => “AOA 2 Valid” “AOA 2 Invalid”
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.
Level 6 Audio readout
Display Select Discrete #1 True => False => “Display Discrete 1 True” “Display Discrete 1 False”
Display Select Discrete #2 True => False => “Display Discrete 2 True” “Display Discrete 2 False”
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 Self-Test if inhibited.
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).
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