747-400 AMM 飞机维护手册点火 IGNITION(31)_航空信息_民用航空_通用航空

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NOTE: Do not clean the center electrode hole on the firing
____
end of the igniter plug.

(b)
Use the wire brush to clean the outer shell of the igniter plug.

1) With that brush, remove the unwanted materials from the external surface of the firing end of the igniter plug.
NOTE: It is not necessary to make the ceramic surface
____ as clean as the surface of a new ceramic part.
S 117-013-N00
(3) Do the steps that follow to clean the contact hole of the igniter plug:
(a) Remove all the dirt and unwanted material from the inner contact hole with the compressed air.
NOTE: A dirty mating surface can decrease the performance
____
and cause arcs.

(b) Use the abrasive rod in a circular hand movement to remove the small quantities of arc damage from the contact button.
NOTE: This will remove the damaged surface layer.
____
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
WARNING: DO NOT GET TRICHLOROETHANE IN YOUR MOUTH OR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM TRICHLOROETHANE. PUT ON A PROTECTIVE SPLASH GOGGLE AND GLOVES WHEN YOU USE TRICHLOROETHANE. KEEP TRICHLOROETHANE AWAY FROM SPARKS, FLAME, AND HEAT. TRICHLOROETHANE IS A POISONOUS AND FLAMMABLE SOLVENT WHICH CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(c)
Make a long bristle brush wet with trichloroethane. 1) Clean the contact hole with the brush and solvent. 2) Use the compressed air to dry the contact hole.

(d)
Make the circular felt bob wet with trichloroethane. 1) Use the circular felt bob in a circular movement to clean

the inner ceramic walls. 2) Use the compressed air to dry the surface.

(e)
Make the short bristle brush wet with trichloroethane. 1) Use the brush and solvent to clean the end surface of the

ceramic that is adjacent to the grommet face. 2) Use the compressed air to dry the surface.
S 427-011-N00
(4) Install the igniter plug (AMM 74-21-02/401).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
IGNITER PLUG - APPROVED REPAIRS
_______________________________
1. General
_______
A. This procedure gives the instructions for the on-wing installation of a new igniter plug boss and guide assembly in case the igniter plug guide is missing and a borescope inspection of the 1st-stage HPT blades shows that there is no damage. The installation of the new igniter boss and guide assembly is a temporary solution until PW SB 72-601 is incorporated.
B. This procedure can be used for both igniter plug positions of the engine.
C. The igniter plug guide is installed in an opening in the outer combustion chamber.
D. You must get the igniter plug boss and guide assembly from your local Pratt & Whitney representative.
E. You must open the right core cowl panel, remove the igniter plug and igniter plug boss to get access to the igniter plug guide.
TASK 74-21-02-308-012-N00
2. Igniter Plug Guide Repair
_________________________
A. Equipment
(1) M303, M305, or M307 Bergen Mechanical Crimper
Bergen Cable Technologies Inc
170 Gregg St