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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
102
3.3.13.22 Terrain Display Select #1 & #2 Discrete
Terrain Display Select #1 & #2 discrete (J1-54 & J1-49) will activate after the related pilot has
initiated manual selection of the Terrain Display Select (momentary) discrete #1 or #2 (J1-32 &
J1-31, Category 6). This feature activates a ‘TERR” white lamp located in the cockpit within sight
of each pilot. The lamp serves to remind the flight crew that this function is active. The select
switches (J1-32 & J1-31) and the indicator lamps (J1-54 & J1-49) are commonly combined in
switch-lamp assemblies mounted near the displays being selected.
3.3.13.23 Timed Audio Inhibit Discrete
The Timed Audio Inhibit discrete (J1-52) will activate after a Timed Audio Inhibit switch
(momentary) is pressed in the cockpit. The discrete will stay active until the Timed Audio Inhibit
latch resets after 5 minutes or the switch is pressed again or the aircraft lands. The discrete is
used to light the ON status portion of the Timed Audio Inhibit lighted switch assembly.
3.3.13.24 Low Altitude Mode Discrete
The Low Altitude Mode discrete (J1-73) will activate after a Low Alt switch (momentary) is
pressed in the cockpit. The discrete is used to light the ON status portion of the Low Altitude
lighted switch assembly. The discrete will stay active as long as the Low Altitude Mode is
selected. The Low Altitude Mode may be de-selected by pressing the Low Alt switch again.