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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:
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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.

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Level 2 — Identifies all failures currently within the system.  Level 2 is accessed by maintenance personnel to help resolve INOP conditions.

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Level 3 —  Identifies the configuration status of the Warning Computer and the installation.

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Level 4 — Identifies faults that have occurred during past flights.  This information can be used to resolve system problems reported by the flight crews.

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Level 5 — Identifies alerts that have occurred during past flights.  This information can be used to resolve system problems reported by the flight crews.

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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.

 

3 FAULT ISOLATION (TROUBLESHOOTING)
3.1 GENERAL
The troubleshooting methods provided in this section identify system and sensor or subsystem faults to the lowest level possible.  Additional fault isolation in the installation or associated sensors or subsystem should be performed using the aircraft installation and wiring diagrams and other supporting documentation in accordance with established maintenance procedures.
Do not remove or replace the EGPWC until all associated sensors or subsystems and their interfaces have been verified per established maintenance procedures and the fault is isolated to the EGPWC.  If the troubleshooting methods determine that the EGPWC is faulty, then the EGPWC should be replaced per Section 6.  Route the faulty EGPWC to an authorized repair facility for repair.

3.2 TROUBLESHOOTING GUIDE
In general, if any EGPWS Inoperative status is indicated, the EGPWC front panel LED’s should be checked.  The following table shows the recommended maintenance action in response to the front panel LED’s.
EXTERNAL FAULT  COMPUTER OK  COMPUTER FAIL  CORRECTIVE ACTION 
OFF  GREEN  OFF  Normal operation. 
YELLOW  GREEN  OFF  Troubleshoot external faults using the Level 2 Self-Test. DO NOT REMOVE OR REPLACE THE EGPWC 
OFF  OFF  OFF  Ensure that the EGPWC is installed in the rack correctly and power to the EGPWC is turned on. 
OFF  OFF  RED  Record the Level 2 Self-Test, if possible. Remove and replace the EGPWC if required. 
　
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