General Visual Inspection (GVI) of the Ignition System [PW11]

TASK 74-00-00-210-801-A
General Visual Inspection (GVI) of the Ignition System

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

ZONE: 400

1. Reason for the Job
Use this procedure to do a General Visual Inspection (GVI) of the ignition system.
For more information about the ignition system, refer to (74-00-00-00U).
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

B. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-832-A	Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-21-63-000-802-A	Removal of the Electronic Engine Control (EEC) Wiring Harness (W03)
TASK 73-21-63-400-802-A	Installation of the Electronic Engine Control (EEC) Wiring Harness (W03)
TASK 73-21-64-000-802-A	Removal of the Electronic Engine Control (EEC) Wiring Harness (W04)
TASK 73-21-64-400-802-A	Installation of the Electronic Engine Control (EEC) Wiring Harness (W04)
TASK 73-25-34-400-802-A	Installation of the Engine Interface Unit (EIU)
TASK 74-00-00-210-802-A	Detailed Visual Inspection of the Ignition System
TASK 74-11-01-000-801-A	Removal of the Ignition Exciter
TASK 74-11-01-400-801-A	Installation of the Ignition Exciter
TASK 74-21-00-100-801-A	Cleaning of the Ignition Exciter, Ignition Cables and Igniters
TASK 74-21-01-000-801-A	Removal of the Igniter Plug
TASK 74-21-01-400-801-A	Installation of the Igniter Plug
TASK 74-21-61-000-802-A	Removal of the Ignition Cables
TASK 74-21-61-400-802-A	Installation of the Ignition Cables
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Ignition System - Ignition Exciter
Ignition System - Ignition Cables
Ignition System - W03 Harness
Ignition System - W04 Harness

3. Job Set-up
Subtask 74-00-00-941-053-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).

Subtask 74-00-00-865-063-A ** ON A/C NOT FOR ALL

B. Open, safety and tag these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42

Subtask 74-00-00-010-053-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR

Subtask 74-00-00-040-051-A ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 74-00-00-010-054-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

4. Procedure
Subtask 74-00-00-210-051-A ** ON A/C NOT FOR ALL

A. General Visual Inspection (GVI) of the Ignition System

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Removal of individual system components may be necessary to facilitate further troubleshooting of the ignition system (Ref. AMM TASK 74-00-00-210-802).
(2) Do a GVI of the ignition system. Refer to Table 601. See the figure

Ignition System - Ignition Cables ** ON A/C NOT FOR ALL

through

Ignition System - Ignition Exciter ** ON A/C NOT FOR ALL

NOTE: The igniter plug can show signs of superficial corrosion because of external surface tarnish. This condition is normal and does not effect the form, fit, or function of the igniter. It is not necessary to clean or try to remove the tarnish. You can return all igniter plugs to service that correctly complete all inspections and tests.

Table 601 - GVI Of The Ignition System

EXAMINE	DAMAGE	DISPOSITION
Harness (W03) connector (P66) and harness (W04) connector (P67) for:
Looseness	All quantities	Tighten.
Damage	All quantities	Not permitted. Replace the harness. Refer to (Ref. AMM TASK 73-21-63-000-802) and (Ref. AMM TASK 73-21-63-400-802) for harness (W03). Refer to (Ref. AMM TASK 73-21-64-000-802) and (Ref. AMM TASK 73-21-64-400-802) for harness (W04).
Harness (W03) and harness (W04) for:
Damage	All quantities	Not permitted. Replace the harness. Refer to (Ref. AMM TASK 73-21-63-000-802) and (Ref. AMM TASK 73-21-63-400-802) for harness (W03). Refer to (Ref. AMM TASK 73-21-64-000-802) and (Ref. AMM TASK 73-21-64-400-802) for harness (W04).
Ignition exciter case for:
Scratches	Scratches are permitted provided the scratch does not go through the plating and is less than 0.003 in. (0.076 mm) in depth, 0.015 in. (0.381 mm) in width or 1.0 in. (25.40 mm) in length
	More than the permitted limits	Not permitted. Replace the exciter. Refer to (Ref. AMM TASK 74-11-01-000-801) and (Ref. AMM TASK 74-11-01-400-801).
Ignition exciter case mount bolts for:
Looseness	All quantities	Tighten. Refer to (Ref. AMM TASK 74-11-01-400-801).
Damage	All quantities	Not permitted. Replace the bolts. Refer to (Ref. AMM TASK 74-11-01-400-801).
Ignition exciter ground strap for:
Looseness	All quantities	Tighten. Refer to (Ref. AMM TASK 74-11-01-400-801).
Damage	All quantities	Not permitted. Replace the strap. Refer to (Ref. AMM TASK 74-11-01-000-801) and (Ref. AMM TASK 74-11-01-400-801).
A and B ignition cable for:
Cable tube and elbow looseness or damage	All quantities	Not permitted. Replace the cable. Refer to (Ref. AMM TASK 74-21-61-000-802) and (Ref. AMM TASK 74-21-61-400-802).
Cable coupling nut rounded corners	All quantities	Not permitted. Replace the cable. Refer to (Ref. AMM TASK 74-21-61-000-802) and (Ref. AMM TASK 74-21-61-400-802).
Cable conduit	Chafing that goes through the outer conduit assembly braid with a length no more than 1.0 in. (25.4 mm) or more than one half of the circumference is permitted. Chafing areas must be separated by 3.0 in. (76.2 mm) and the total amount of chafing must not be more than ten percent of the total cable length. Small contact wear is permitted to the conduit core. No damage is permitted to the conduit core. To prevent more chafing, move cable tension between spring clips to make sure there is no interference condition.	Not permitted. Replace the cable. Refer to (Ref. AMM TASK 74-21-61-000-802) and (Ref. AMM TASK 74-21-61-400-802).
	Chafing more than the permitted limits, cuts or other damage.
	Dirt, oil or conductive contaminants	Not permitted. Clean the conduit. Refer to (Ref. AMM TASK 74-21-00-100-801).
Igniter plug for:
General condition	All damage	Not permitted. Replace the igniter plug. Refer to (Ref. AMM TASK 74-21-01-000-801) and (Ref. AMM TASK 74-21-01-400-801).

(3) Examine the assembly for foreign objects, damage and correct assembly.

5. Close-up
Subtask 74-00-00-410-053-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR

Subtask 74-00-00-440-051-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 74-00-00-410-054-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)

Subtask 74-00-00-865-064-A ** ON A/C NOT FOR ALL

D. Remove the safety clips and tags and close these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
FOR FIN: 1000EM1 (ENGINE1)
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
FOR FIN: 1000EM2 (ENGINE2)
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42

[Rev.10 from 2021] 2026.04.01 13:02:10 UTC