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EGPWS LINE MAINTENANCE MANUAL
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 43 of 68
3.8.16 MODE 6 VOLUME CONTROL DISCRETE
Type: Mode 6 low volume select switch
Signal Status: Low Volume Select or Normal Volume
“Low Volume” in this case refers to the -6db volume level used during Self-Test. “Normal Volume” refers to the level
of the selected call-out menu.
Level 6 Audio readout
Mode 6 Low Volume Discrete
Low Volume =>
Normal =>
“Mode 6 Low Volume”
“Mode 6 Normal Volume”
3.8.17 CALLOUTS ENABLE DISCRETE (MK V AND MK VII ONLY)
Type: Mode 6 Altitude callouts enable switch
Signal Status: Callouts Enable or Callouts Disable with optional Minimums only
Level 6 Audio readout
Altitude Callouts Enable Discrete
Voice Enabled =>
Voice Disabled =>
“Callouts Enabled”
“Callouts Disabled”
3.8.18 GND 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 the 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
GND Audio Inhibit Discrete
GPWS Inhibit =>
Not Inhibit =>
“Audio Inhibit”
“Audio Not Inhibit”
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
+28V Audio Inhibit Discrete
GPWS Inhibit =>
Not Inhibit =>
“28V Audio Inhibit”
“28V Audio Not Inhibit”