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EGPWS LINE MAINTENANCE MANUAL
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO.: 060-4199-180 REV: G SHEET 42 of 68
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
Glideslope Inhibit Discrete
Inhibit =>
Not Inhibit =>
“Glideslope Inhibit True”
“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
+28V Glideslope Inhibit Discrete
Inhibit =>
Not Inhibit =>
“28V Glideslope Inhibit True”
“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
Glideslope Cancel Discrete
Cancel =>
Normal =>
“Glideslope Canceled”
“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
DH Discrete
Less Than DH =>
Greater Than DH =>
“Below DH”
“Above DH”