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MK VI MK VIII EGPWS Installation Design Guide
Proprietary notice on title page applies
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-150 REV:
SHEET
104
Ground seeking Landing Flap discrete active position:
Flap Reversal (Category 7)
Flap Discrete (J1-18) False True
Landing Flap discrete = GND Flaps Up Flaps Down
Landing Flap Discrete = Open (or +28V) Flaps Down Flaps
Cat. 13 ID 254/255 only *
Flap Override = OVRD GND GND
Flap Override = NORM Open Open
* Category 13 ID 254/255 must use this method for Flap Override.
3.15.1.3 Audio Inhib it Discrete
The Audio Inhibit discrete is an optional input but is strongly recommended to maintain audio and visual
prioritization. When activated, this discrete inhibits all audio (Ground Proximity and Terrain Awareness).
Activation of the Audio Inhibit input for more than 60 seconds will result in the “All Modes Inhibit” fault.
The Audio Inhibit discrete input can be connected to any or all of the following (as applicable to the aircraft
configuration):
- the Stall Warning computers (this is required for CAA-registered aircraft)
- the Predictive Windshear (PWS) Audio Inhibit output discrete
- a separately labeled guarded cockpit switch
- the reactive Windshear system if separate from the EGPWS.
For some existing GPWS installations, this discrete may have been tied to the analog Radio Altimeter Receiver-
Transmitter Self-Test output. This connection is no longer required but may be left intact for retrofit installations.
Discrete Position / Status Connector Pin
Audio Inhibit +28 Inhibit = +28V
Not Inhibit = Gnd/Open
J1-36
Audio Inhibit Gnd Inhibit = Gnd
Not Inhibit = +28V /Open
J1-17
3.15.1.4 Landing Ge ar Discrete
Landing Gear discrete is supplied by the Gear (or Gear handle) switch. The active position (+28V or GND)
indicates “Gear Down” and should be connected to a contact that will indicate Gear Down when the Gear are
lowered prior to 500 feet Radio altitude.
Discrete Position / Status Connector Pin
Landing Gear +28 Down = +28V
Not Down = Gnd/Open
J1-35
Landing Gear Gnd Down = Gnd
Not Down = +28V /Open
J1-16
For Fixed Gear aircraft the Audio Menu in Category 5 should be ID 2 or 3 and one of the following Gear Discrete
arrangements should be used to simulate Gear Down to the EGPWS.