(g)  
If necessary, clean the threads of the igniter plug port in the diffuser case with the PWA 27641 chasing tap.

 (h)  
Install the tab washer on the igniter plug boss.

 1)  Bend the keys of the tab washer around the flange of the igniter plug boss.

 (i)  
Install the igniter plug boss, the igniter plug and the spacers (previously selected) (AMM 74-21-02/401).

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 74-21-02
 ALL  ú ú N02 Page 611 ú Oct 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
IGNITER PLUG - CLEANING/PAINTING
________________________________
 1.  General
_______
 A.  This procedure gives the steps to clean the igniter plugs.
 B.  Each engine has two equal igniter plugs in the diffuser and combustor case.
 (1)  
You can find one of the igniter plugs at the 4 o'clock position.

 (a) This igniter plug is part of ignition system 1.

 (2)  
You can find the other igniter plug at the 5 o'clock position.

 (a) This igniter plug is part of ignition system 2.
 C.  We recommend that you do this procedure before the inspection of the igniter plugs.
 TASK 74-21-02-107-001-N00
 2.  Clean the Igniter Plug
______________________
 A.  Standard Tools and Equipment
 (1)  
Air Source - Compressed, Clean, Filtered, Dry - 30 psi (200 kPa) maximum

 (2)  
Felt Bob - Circular, for use with hand chuck - 0.5 inch (13 mm) diameter, 1.75 inches (45.5 mm) long

 (3)  
Brush - Short Bristle, Nonmetallic

 (4)  
Bush - Wire

 (5)  
Brush - Long Bristle, Nonmetallic

 B.  Consumable Materials
 (1)  
B00448 Solvent - 1,1,1 Trichloroethane Inhibited, MIL-T-81533

 (2)  
B00148 Solvent - Methyl Ethyl Ketone (MEK), TT-M-261

 (3)  
G00766 Rod - Abrasive, Rubberized

 C.  References
 (1)  
AMM 74-21-02/401, Igniter Plug

 (2)  
IPC 74-21-02 Fig. 5

 D.  Access
 (1)  
Location Zone
 412 Engine No. 1
 422 Engine No. 2
 432 Engine No. 3
 442 Engine No. 4

 (2)  
Access Panel 418 Right Core Cowl Panel - Engine No. 1 428 Right Core Cowl Panel - Engine No. 2 438 Right Core Cowl Panel - Engine No. 3 448 Right Core Cowl Panel - Engine No. 4

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 74-21-02
 ALL  ú ú N01 Page 701 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

PLUG CABLE
A-A

ARC DAMAGE ON THE CONTACT BUTTONNO ARC DAMAGE ON THE CONTACT BUTTON (NEW IGNITER PLUG)
B-B
Igniter Plug Cleaning Figure 701
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 74-21-02
 ALL  ú ú N01 Page 702 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E.  Procedure (Fig. 701)
 S 027-002-N00
 (1)  
Remove the igniter plugs (AMM 74-21-02/401).

 S 117-012-N00

 (2)  
Do the steps that follow to clean the outer shell of the igniter plug:

 WARNING: DO NOT GET METHYL ETHYL KETONE (MEK) IN YOUR MOUTH OR
_______ EYES, OR ON YOUR SKIN. DO NOT BREATHE THE FUMES FROM MEK. PUT A PROTECTIVE SPLASH GOGGLE AND GLOVES ON WHEN YOU USE MEK. KEEP MEK AWAY FROM SPARKS, FLAME, AND HEAT. MEK IS A POISONOUS AND FLAMMABLE SOLVENT WHICH CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (a)  Use MEK to remove the grease from the outer shell of the igniter plug.
　
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