Honeywell MK VI - Manual (Page 108)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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3.15.1.11 Steep Appr oach Discrete #2
For some installations a Steep Approach bias can be optionally applied to the Mode 1 curves. If Steep Approach
is enabled (Category 7) and the Steep Approach discrete is selected (Category 13), then fixed positive biases
are added to both the Sinkrate curve (500 fpm), and the Pull Up curve (200 fpm).
Category 7 enables the Steep Approach function for the installation. Steep Approach is activated using the
Steep Approach discrete. Steep Approach discrete #2 is selected in flight when starting a steep approach.
Steep Approach discrete #2 should not be hardwired. On ground self-test is inhibited if Steep Approach is
active.
Momentary action (Category 13, ID’s 6 and 7 only)
Discrete Position / Status Connector Pin
Steep Approach Steep Approach Toggle = Gnd
Normal (no action) = Open
J2-31
Alternate action (Category 13, all ID’s except ID 6 and 7)
Discrete Position / Status Connector Pin
Steep Approach Selected = Gnd
Not Selected = Open
J2-31
Momentary action (preferred method) enables a (non-latching) cockpit switch. Reference 3.15.2.9 Steep
Approach Discrete for associated lamp output. The Steep Approach output lamp activates when the switch is
pressed or when Envelope Modulation automatically activates steep approach and deactivates on landing.
3.15.1.12 GPWS INHI BIT Discrete (alternate action)
The GPWS INHIBIT discrete inhibits the GPWS modes of the MK VI/VIII EGPWS (all audio and visual except
for WS, TA & TCF). This discrete is typically connected to an “alternate action switch” in the cockpit. The
recommended label for this switch is “GPWS INHIBIT” although labeling for this switch should be consistent with
existing cockpit nomenclature. Activation of this switch for more than 5 seconds will result in a GPWS INOP
indication.
Discrete Position / Status Connector Pin
GPWS INHIBIT Inhibit = Gnd
Normal = Open
J1-67
3.15.2 Output Disc retes
The discrete outputs are defined in Appendix E Section 7.4. The MK VI/VIII EGPWS supports two kinds of
Ground/Open discrete outputs used to indicate various conditions. Monitor outputs are used to indicate failure
conditions for the EGPW system. Monitor outputs default to an active state when there is a failure or if power is
removed from the EGPWS (no connection if the EGPWC is removed from the rack). The Discrete Out Lamp
driver outputs are used to indicate alert modes (GPWS WARN, BELOW GS, etc.) or mode control status (FLAP
OVRD, Terrain Display Select, etc.) of the EGPWS.