Cleaning of the Ignition Exciter, Ignition Cables and Igniters [PW11]

TASK 74-21-00-100-801-A
Cleaning of the Ignition Exciter, Ignition Cables and Igniters

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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 400

1. Reason for the Job
Use this procedure to clean the ignition exciter, ignition cables and igniters.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-005)	lint-free cotton cloth
(Material No.P05-051)	Rubberized Abrasive Rod
(Material No.P05-058)	Brush
(Material No.P11-014)	isopropyl alcohol

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

D. Referenced Information

REFERENCE	DESIGNATION
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 74-21-01-000-801-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

3. Job Set-up
Subtask 74-21-00-860-050-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Procedure

WARNING: WHEN YOU USE COMPRESSED AIR FOR CLEANING OR DRYING, MAKE SURE THAT THE PRESSURE IS NOT MORE THAN 30 PSIG (206.8 KPA). IF THE PRESSURE IS MORE THAN 30 PSIG (206.8 KPA), INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT CAN OCCUR.

Subtask 74-21-00-100-050-A ** ON A/C NOT FOR ALL

A. Cleaning of the Ignition Exciter

WARNING: THE IGNITION SWITCH MUST BE IN THE "OFF" POSITION BEFORE YOU REMOVE IGNITION COMPONENTS. THE IGNITION SYSTEM USES HIGH ENERGY WHICH IS DANGEROUS. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY OR DEATH CAN BE THE RESULT.

WARNING: BEFORE YOU REMOVE/INSTALL IGNITION COMPONENTS:

WAIT FOR SOME MINUTES AFTER THE IGNITION SYSTEM IS USED
MAKE SURE THAT THE ENG/MODE SELECTOR SWITCH IS IN THE NORM POSITION.

AFTER YOU REMOVE THE IGNITER LEAD FROM THE IGNITER PLUG, IMMEDIATELY PUT THE IGNITION LEAD TERMINAL IN CONTACT WITH A GOOD GROUND TO LET ALL OF THE ELECTRICAL ENERGY OUT OF THE SYSTEM. THE IGNITION SYSTEM VOLTAGE IS VERY HIGH. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY OR DEATH CAN OCCUR.

WARNING: AFTER YOU DISCONNECT THE LEAD NUT FROM THE IGNITER PLUG, IMMEDIATELY PUT THE LEAD END AGAINST THE IGNITER PLUG BODY. THIS WILL RELEASE ALL OF THE ELECTRICAL ENERGY FROM THE IGNITION SYSTEM. THE IGNITION SYSTEM USES HIGH ENERGY WHICH IS DANGEROUS. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY OR DEATH CAN BE THE RESULT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Remove the ignition exciter from the engine (Ref. AMM TASK 74-11-01-000-801).
(2) Remove dirt or foreign material from the inner contact well with AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.

NOTE: Compressed air must not exceed 30 psig (206.8 kPa) maximum pressure. Dirt on the contact surface will cause decreased output or arcing.

(3) Use a Brush (Material No.P05-058) wet with isopropyl alcohol (Material No.P11-014) to clean the ignition exciter outlet contact.
(4) Dry with AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.

NOTE: Compressed air must be kept at 30 psig (206.8 kPa) maximum pressure.

(5) Use a Rubberized Abrasive Rod (Material No.P05-051) and with a circular movement of the hand, remove small quantities of arcing and discoloration of the contact button.
(6) Clean the ignition exciter outlet contact again with the Brush (Material No.P05-058) wet with isopropyl alcohol (Material No.P11-014) after removal of the arcing and/or discoloration.
(7) Use a circular felt bob, 0.375 in. (9.52 mm) in diameter and approximately 1.750 in. (44.45 mm) long, for use with a hand chuck wet with isopropyl alcohol (Material No.P11-014) to clean the inner ceramic walls with a circular movement of the hand.
(8) Dry with AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.

NOTE: Compressed air must be kept at 30 psig (206.8 kPa) maximum pressure.

(9) Use a Brush (Material No.P05-058) wet with isopropyl alcohol (Material No.P11-014) to clean the end surface of ceramic at the seat of the grommet face.
(10) Dry with AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.

NOTE: Compressed air must be kept at 30 psig (206.8 kPa) maximum pressure.

(11) Install the ignition exciter to the engine (Ref. AMM TASK 74-11-01-400-801).

Subtask 74-21-00-100-051-A ** ON A/C NOT FOR ALL

B. Cleaning of the Ignition Cable

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Remove the ignition cable (cable A or B) from the engine (Ref. AMM TASK 74-21-61-000-802).
(2) Remove dirt or foreign material from the inside spring with AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.

NOTE: Compressed air must not exceed 30 psig (206.8 kPa) maximum pressure. Dirt on the contact surface will cause decreased output or arcing.

(3) Use a lint-free cotton cloth (Material No.P05-005) wet with isopropyl alcohol (Material No.P11-014) to clean the high tension sleeve.
(4) Dry with AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.

NOTE: Compressed air must be kept at 30 psig (206.8 kPa) maximum pressure.

(5) Use a lint-free cotton cloth (Material No.P05-005) wet with isopropyl alcohol (Material No.P11-014) to clean the conduit assembly.
(6) Dry with AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.

NOTE: Compressed air must be kept at 30 psig (206.8 kPa) maximum pressure.

(7) Use a Rubberized Abrasive Rod (Material No.P05-051) and with a circular movement of the hand, remove small quantities of arcing and discoloration of the contact button.
(8) Use a lint-free cotton cloth (Material No.P05-005) wet with isopropyl alcohol (Material No.P11-014) to clean the high tension contact if necessary.
(9) Dry with AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY.

NOTE: Compressed air must be kept at 30 psig (206.8 kPa) maximum pressure.

(10) Install the ignition cable (cable A or B) to the engine (Ref. AMM TASK 74-21-61-400-802).

Subtask 74-21-00-100-052-A ** ON A/C NOT FOR ALL

C. Cleaning of the Igniter Plug

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Remove the igniter plug (plug A or B) from the engine (Ref. AMM TASK 74-21-01-000-801).
(2) Use a lint-free cotton cloth (Material No.P05-005) wet with isopropyl alcohol (Material No.P11-014) to clean the plug.

NOTE: It is not recommended to clean the center electrode cavity, which is in a recess, on the firing end of the igniter plug.

(3) Use a Brush (Material No.P05-058) and clean the outer shell of the igniter plug.
(4) Use a Brush (Material No.P05-058) wet with isopropyl alcohol (Material No.P11-014) to remove unwanted materials from the external surface of the firing end of the igniter plug. It is not necessary to clean the ceramic to look almost the same as a new ceramic surface.
(5) Use AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to remove dirt or unwanted materials from the inside contact well.

NOTE: Compressed air must not exceed 30 psig (206.8 kPa) maximum pressure. Dirt on the contact surface will cause decreased output or arcing.

(6) Use a Rubberized Abrasive Rod (Material No.P05-051) and with a circular movement of the hand, remove small quantities of arcing and discoloration of the contact button.
(7) Install the igniter plug (plug A or B) to the engine (Ref. AMM TASK 74-21-01-400-801).

5. Close-up
Subtask 74-21-00-860-051-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.

[Rev.10 from 2021] 2026.04.01 03:08:27 UTC