User's Manual

Table Of Contents
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
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CAS/Part No.9005000
The Glideslope Inhibit Discrete input is used to inhibit Mode 5 Glideslope alerting.
This discrete would typically be enabled by a Flight Deck switch during back-
course approaches (see ILS Back-Course).
(6) Glideslope Cancel
The Glideslope Cancel Discrete input is typically a Flight Deck switch that is used
to cancel Glideslope alerting when an unreliable Glideslope is expected or when
maneuvering is required during ILS final approach.
(7) Decision Height/Minimum Descent Altitude Selection (DH/MDA)
The DH/MDA Discrete input is used select either the Decision Height or Minimum
Descent Altitude input. The selected DH or MDA is used to determine Altitude
Call-Outs.
(8) Below Decision Height
The Below Decision Height Discrete input is to trigger Altitude Call-Outs.
(9) Aircraft On Ground
The Aircraft On Ground Discrete input is shared between the TCAS and TAWS
functions with separate internal wiring.
(10) ILS Back Course
The ILS Back Course Discrete input is used to indicate that a back-course
landing approach has been selected/detected.
A back-course approach is a landing approach in which the localizer signal lobes
have been reversed. Typically the back-course switch is selected on the Auto-
Pilot control panel and will compensate for the reversal of the localizer radio
beams. Additionally, when Back-Course is selected, the Glideslope radio beams
become invalid (resulting in the Glideslope Inhibit discrete being set).
Pub. No. 8600200-001, Revision 004
34-45-29
4-155
04 Nov 2014
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