3.8.12 GND GLIDESLOPE INHIBIT DISCRETE
Type: Switch for inhibit of Glideslope mode Signal Status: Glideslope Inhibit or Not Inhibit Fault monitoring: Mode 5 will be disabled and “Glideslope” will not be enunciated during cockpit Self-Test and the
long vocabulary test if inhibited.
Level 6 Audio readout
Inhibit => “Glideslope Inhibit True”
Glideslope Inhibit Discrete
Not Inhibit => “Glideslope Inhibit False”
3.8.13 +28 V GLIDESLOPE INHIBIT DISCRETE
Type: Switch for inhibit of Glideslope mode Signal Status: Glideslope Inhibit or Not Inhibit Fault monitoring: Mode 5 will be disabled and “Glideslope” will not be enunciated during cockpit Self-Test and the
long vocabulary test if inhibited.
Level 6 Audio readout Inhibit => “28V Glideslope Inhibit True” +28V Glideslope Inhibit Discrete
Not Inhibit => “28V Glideslope Inhibit False”
3.8.14 GND GLIDESLOPE CANCEL DISCRETE
Type: Supplied by momentarily actuated cockpit Glideslope mode manual inhibit switch.
Signal Status: Glideslope is canceled if glideslope function is active
Fault monitoring: Activation of this input for more than 15 seconds will result in the ‘Glideslope Cancel Invalid’ fault which will cause a GPWS INOP indication. Typically, the Glideslope cancel can only be selected below 2000 feet AGL. However, some configurations only allow it below 1000 feet AGL.
Level 6 Audio readout
Cancel => “Glideslope Canceled”
Glideslope Cancel Discrete
Normal => “Glideslope Enabled”
3.8.15 DECISION HEIGHT DISCRETE
Type: Decision Height Bug switch Signal Status: Less than Decision Height or Greater than Decision Height
Level 6 Audio readout
Less Than DH => “Below DH”
DH Discrete
Greater Than DH => “Above DH”
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
Low Volume => “Mode 6 Low Volume”
Mode 6 Low Volume Discrete
Normal => “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
Voice Enabled => “Callouts Enabled”
Altitude Callouts Enable Discrete
Voice Disabled => “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.
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