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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
101
For Lamp Format Type 1, the amber “Below G/S” lamp is driven by the GPWS Alert (Glideslope
only) discrete and the red “GPWS” lamp is driven by the remaining alerts and warnings.
For Lamp Format Type 2, the red “EGPWS” lamp is driven by the GPWS Warning (Pull Up,
Warning Terrain, and Warning Obstacle only) discrete and the amber “EGPWS” lamp is driven by
the remaining alerts and warnings.
3.3.13.16 GPWS INOP Discrete
The GPWS INOP discrete (J1-72) indicates GPWS modes are inoperative. This feature activates
a ‘GPWS INOP” lamp located in the cockpit within sight of the pilots.
3.3.13.17 TAD INOP Discrete
The TAD INOP discrete (J1-55) indicates, Terrain Awareness (TA), and Terrain Display are ‘Not
Available’. This feature activates a ‘TERRAIN INOP” lamp located in the cockpit within sight of the
pilots.
3.3.13.18 GPWS Warning Discrete
(Lamp Format Type 1 definition)
GPWS Warning discrete (J1-78) will activate during any Mode 1 through Mode 4 alert or warning,
Terrain Awareness caution/warning, and Obstacle Awareness caution/warning. This feature
activates a ‘GPWS” lamp located in the cockpit within sight of each pilot. Note that Mode 6 does
not activate any lamp outputs, only voices.
3.3.13.19 GPWS Alert Discrete
(Lamp Format Type 1 definition)
GPWS Alert discrete (J1-77) will activate during Mode 5 Glideslope cautions only. This feature
activates a ‘BELOW GS” red lamp located in the cockpit within sight of each pilot.
3.3.13.20 Glideslope Cancel Discrete
-Optional- Glideslope Cancel discrete (J1-76) will activate when the Glideslope Cancel discrete
(momentary) has been pressed any time below 2000 feet Radio Altitude if the ILS is tuned. This
feature activates a ‘G/S CAN” amber lamp located in the cockpit within sight of the pilots.
3.3.13.21 TCAS Inhibit Discrete
-Optional- TCAS Inhibit discrete (J1-69) will activate during any EGPWS voice annunciation. This
output is used to inhibit TCAS from talking during EGPWS annunciation. This feature does not
have a lamp associated with it.