Honeywell MK VI - Manual (Page 107)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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Discrete Position / Status Connector Pin
Mode 6 Low Volume Low Volume = Gnd
Not Low Volume = Open
J1-13
3.15.1.8 Autopilot E ngaged Discrete
For airplanes fitted with an Autopilot, additional Bank Angle mode protection is provided when the Autopilot is
engaged. If the Autopilot is engaged the Bank Angle roll angle limit advances to 33 degrees from 50 degrees.
This input discrete should be connected to a +28V active (engaged) output discrete from the Autopilot system
that indicates the Autopilot has authority over the controls of the aircraft. For aircraft with Touch Control
Steering, the input should be connected to the clutch engaged output discrete.
Discrete Position / Status Connector Pin
Autopilot Engaged Engaged = +28V
Not Engaged = Open
J1-8
3.15.1.9 Terrain Aw areness and TCF Inhibit Discrete
The Terrain Awareness and TCF Inhibit discrete inhibits the Terrain Awareness and TCF modes of the MK
VI/VIII EGPWS. This discrete is required for all installations that do not disable TA&D and TCF in
Category 6.
This discrete is typically connected to an “alternate action switch” in the cockpit. The recommended label for
this switch is “Terrain Override” although labeling for this switch should be consistent with existing cockpit
nomenclature.
“Terrain Inhibited” will be annunciated during cockpit Self-Test if these functions are inhibited.
Discrete Position / Status Connector Pin
TA & TCF Inhibit Inhibit = Gnd
Not Inhibit = Open
J1-12
3.15.1.10 Self Test D iscrete
The cockpit Self Test discrete is provided to manually initiate test of the EGPWC, EGPWS aircraft interface, and
to enunciate system configuration and status information. This discrete is typically supplied by a momentary
action cockpit ‘push to test’ switch, typically part of the GPWS WARN Lamp assembly.
This discrete must be momentarily connected to ground to activate the Self Test. Activation of this discrete
continuously for more than 60 seconds will result in the ‘Self Test Invalid’ fault which will cause a GPWS INOP
indication.
Discrete Position / Status Connector Pin
Self Test Self Test = Gnd
Normal = Open
J1-34