Self-Test Functions - Honeywell MK V Line Maintenance Manual

2.3.5 SELF-TEST FUNCTIONS

The EGPWC supports a manually operated Self-Test sequence for indicating the operational status of the system.
The Self-Test aurally enunciates the EGPWS status and activates outputs (lights and displays) for visual
verification. The EGPWC Self-Test includes detailed configuration and status information for the EGPWC and
aircraft installation, maintenance information detailing the cause of detected faults, and historical information about
faults and alerts that occurred during previous flights. The Self-Test Function can only be accessed while on the
ground.
NOTE: Self-Test can be inhibited based on several configuration conditions (see Self-Test Preamble section 3.3.1).
EGPWS Self-Test is divided into six levels:
•
Level 1 — Identifies the status of each of the major functions of the EGPWS. This is the normal pre-flight test
performed by the flight crew.
•
Level 2 — Identifies all failures currently within the system. Level 2 is accessed by maintenance personnel to
help resolve INOP conditions.
•
Level 3 — Identifies the configuration status of the Warning Computer and the installation.
•
Level 4 — Identifies faults that have occurred during past flights. This information can be used to resolve
system problems reported by the flight crews.
•
Level 5 — Identifies alerts that have occurred during past flights. This information can be used to resolve
system problems reported by the flight crews.
•
Level 6 — Identifies state changes in the input discretes. This information can be used to verify the installation
and proper function of all discrete inputs.
Self-Test aural is heard over the cockpit speaker, cockpit interphone system, or through the headphone jack on the
EGPWC front panel (MK V and MK VII only). Details of these Self-Test levels are provided in Fault Isolation
Section 3.
CAGE CODE: 97896
EGPWS LINE MAINTENANCE MANUAL
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