Technical data

Product Specification
HIF-2121/R5 CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 965-1176-601 REV: D SHEET 117
6.10.6 Self-Test
The EGPWC provides self-test capability on the ground. This provides an indication of the ability of the EGPWC to perform
its intended function.
The EGPWC self-test is initiated by momentarily pressing the cockpit self-test button. The self-test results are annunciated, at
6db lower than the normal audio level selected for the aircraft, via the same audio system as the EGPWS alerts. The self-test
has been divided into six different levels to aid in testing and troubleshooting of the EGPWC.
The self-test has six levels which are as follows:
Level 1 = Go / No Go Testing- provides an overview of the current operational
functions selected and provides an indication of their operational
status
Level 2 = Current faults - provides a listing of the internal and external faults
currently detected by the EGPWC
Level 3 = EGPWS Configuration - indicates the current configuration by
listing the current hardware, software, databases and configuration
module options detected by the EGPWC
Level 4 = Fault history - provides a historical record of the faults both internal
and external detected by the EGPWC
Level 5 = Warning history - provides a historical record of the warnings and
cautions given by the EGPWS
Level 6 = Discrete Test - provides annunciation of discrete input transitions to
be used for maintenance support
To expedite the navigation of self-test levels and information two types of cancel sequences are supported. Pressing and
holding the cockpit self-test button for less than 2 seconds is considered a Short Cancel. Pressing and holding the cockpit
self-test button for more than 2 seconds is considered a Long Cancel. The result of performing a short or long cancel is
defined below for each self-test level.
Self-test is inhibited when steep approach is active (enabled and selected).
Self-test is exited if “In Air” becomes true.
Note: the EGPWS self-test is common to the MKV/VI/VII/VIII EGPWS and the Figures are generic to all. Functions not
applicable to the MKVI/MKVIII EGPWS (e.g. windshear) are bypassed in the actual self-test operation.