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2. Trouble Shooting Chart
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
No spark at igniter plugs Exciter inoperative Igniter plug defective High tension lead defective Disconnect electrical connector at exciter unit input and check for power and ground at connector. If power and ground exist, try substitute exciter known to be operative and perform aural check of igniter plugs (Ref 74-00, A/T). If substitute exciter sparks the igniter plugs, the exciter in question is inoperative WARNING: TAKE PRECAUTIONS TO AVOID PERSONAL INJURY WHILE CONDUCTING FUNCTIONAL CHECKS ON IGNITER PLUGS. MAKE SURE EXCITER ENERGY IS COMPLETELY DISCHARGED BEFORE HANDLING IGNITION LEADS AND CLEAR FUEL VAPOR FROM ENGINE Activate ignition system from cockpit and listen for firing of igniter plugs (Ref 74-00, A/T), also make a visual inspection of igniter plug every time an aural check is performed (Ref 74-00, I/C) Disconnect high tension lead from exciter and igniter plug, check for continuity and perform High Tension Leads - Inspection/Check Replace defective exciter Replace igniter plugs as necessary Replace high tension leads as necessary
P&WA72-00, Page 140, May 01/82
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Switches, electrical connectors and/or wiring defective Disconnect electrical connector at exciter input and check for power and ground. If power and ground do not exist, visually check all wiring and electrical connectors; perform Start Lever Switch - Adjustment/Test, and check for power and ground at engine start control switches Replace faulty switch or repair electrical circuit as necessary
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IGNITION SYSTEM - MAINTENANCE PRACTICES
1. General
A. This section provides a listing of the ignition system maintenance operations that require the performance of an ignition system functional test (Ref. 74-00, A/T) upon completion. These maintenance operations are as follows:
(1)
Ignition exciter - Removal/Installation (74-11-11)
(2)
High tension leads - Removal/Installation (74-21-11)
(3)
Igniter plugs - Removal/Installation (74-21-21)
B. Engine start switch installation (OHM 31-10-01) should be followed by a test per 74-31-12 for the four position switch or 74-31-13 for the five position switch.
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IGNITION SYSTEM - ADJUSTMENT/TEST
1. General
A. The ignition system test consists of operating the engine ignition system and verifying operation of the igniter plugs.
B. The test applies to either engine. Ensure sequence is applied to the engine being tested.
2. Equipment and Materials
A. Tester - Igniter plug - JT8D. Model No. VTM 1015. Versa - Tool Manufacturing, 2225 River Hill Road, Irving, Texas 75061
3. Test Ignition System
WARNING: DUE TO THE HIGH VOLTAGE GENERATED DURING THIS TEST, PERSONNEL OTHER THAN INDIVIDUAL STANDING IN CLOSE PROXIMITY TO ENGINE INLET FOR TEST REASONS SHOULD LEAVE THE IMMEDIATE VICINITY OF THE ENGINE BEING TESTED.
CHECK OF IGNITION SYSTEM MUST NOT BE PERFORMED WHEN AIRPLANE IS
IN HANGAR, NEAR BUILDINGS AND/OR OTHER AIRPLANES THAT ARE WITHIN
THE JET WAKE HAZARD AREA FOR GROUND IDLE (REF 71-09-100 MP), OR
DURING AIRPLANE FUELING. ENSURE THAT NO PERSONNEL ARE IN THE JET
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