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MK XXII EGPWS Installation Manual
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C
SHEET
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3.3.7.8 WOW Reversal
The WOW discrete input is defined in Category 13. The Category 7 control is used to reverse the
defined logic to match aircraft wiring, if necessary.
+28 VDC WOW discrete active position:
WOW Reversal
WOW Discrete (Category 13) Not Selected Selected
WOW Discrete = +28V WOW Not WOW
WOW Discrete = Open Not WOW WOW
Ground seeking WOW discrete active position:
WOW Reversal
WOW Discrete (Category 13) Not Selected Selected
WOW Discrete = GND WOW Not WOW
WOW Discrete = Open Not WOW WOW
3.3.7.9 GPS Altitude Reference
The GPS Altitude (label 076, Category 3) may be referenced to mean sea level (MSL) or WGS-
84. Determine which reference the GPS position uses and set the GPS Altitude Reference
accordingly in this Category. If using the internal GPS card select MSL.