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Honeywell
MK XXII EGPWS Installation Manual
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C
SHEET
98
NOTE: The logic sense of the WOW discrete can be reversed by selecting the WOW eversal
option in Category 7, see section 3.3.7.
3.3.13.6 Glideslope Cancel Discrete
The Glideslope Cancel discrete provides the crew with the capability to manually cancel Mode 5
for an approach. This is automatically reset when the aircraft descends below 30 feet or ascends
above 2000 feet or by selecting a non-ILS frequency.
This discrete is typically supplied by a momentary action cockpit Glideslope mode manual inhibit
switch, typically part of the Glideslope Lamp assembly (Below GS).
Discrete Position / Status Connector Pin
Glideslope Cancel Cancel = Gnd
Normal = Open
J1-15
3.3.13.7 Mode 6 Low Volume Discrete
The Mode 6 Low Volume discrete permanently or temporarily modifies the volume of the Mode 6
altitude and bank angle callouts. This discrete operates independent of the Category 14 options.
The Mode 6 Low Volume discrete is used to reduce the Mode 6 volume by 6dB from the volume
level select in Category 14.
This discrete is typically connected to ground to lower the volume an additional 6dB. In some
installations, it is connected to the windshield wiper control to decrease the Mode 6 Volume level
under normal conditions and automatically increase Mode 6 volume 6dB when the cabin noise
increases due to the windshield wipers being on.
Discrete Position / Status Connector Pin
Mode 6 Low Volume Low Volume = Gnd
Not Low Volume = Open
J1-13
3.3.13.8 Autopilot Engaged Discrete
For helicopters this discrete is currently not used.
Discrete Position / Status Connector Pin
Autopilot Engaged Engaged = +28V
Not Engaged = Open
J1-8