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(f) If there were problems with the ignition system, do one of the steps that follow to make sure the igniter guide is there. 1) Remove the other igniter plug to compare each inner
diameter of the opening in the combustion chamber where the igniter plug is installed. a) If the diameters are not the same, the igniter guide is
gone.
2) Measure the inner diameter of the opening in the combustion chamber where the igniter plug is installed. a) If the inner diameter is too large, the igniter guide
is gone.
NOTE: The diameter of the igniter guide is 0.566-0.576
____ inch (14.38-14.63 mm), and the inner diameter of the opening without the igniter guide is 0.890-0.920 inch (22.61-23.37 mm).
(g) If the igniter guide is gone, do a borescope inspection of the 1st-stage HPT blades (AMM 72-00-00/601). 1) If the 1st-stage HPT blades are satisfactory, replace the
igniter boss with an igniter boss and guide assembly (AMM 74-21-02/801).
NOTE: See your local Pratt & Whitney representative to get
____ the igniter boss and guide assembly.
2) If the HPT Blades are not satisfactory, replace the engine (AMM 71-00-02/401).
S 426-008-N00
(2) Install the igniter plug (AMM 74-21-02/401).
TASK 74-21-02-206-009-N00
3. Immersion Depth Check of the Igniter Plug
_________________________________________
A. Special Tools and Equipment
(1) PWA 75509 - Immersion Gage, Pratt & Whitney, Commercial Products Division, 400 Main Street, East Hartford, CT 06108
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EXCITER-TO-IGNITER
PLUG CABLE (REF)
IGNITER PLUG
(UPPER)
SEE B C
DIFFUSER/COMBUSTOR SEE A
CASE (REF)
SEE IGNITER PLUG (LOWER) B C
PUMP (REF) HYDRAULIC CLASSIFIED SPACERS
IGNITER PLUG BOSS
FWD
A TAB WASHER
IGNITER PLUG
B
Igniter Plug Immersion Depth Check Figure 602 (Sheet 1)
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GAGE
HOOK
DIMENSION X
Igniter Plug Immersion Depth Check
Figure 602 (Sheet 2)
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(2)
PWA 24524 - Chasing Tap, Pratt & Whitney
(3)
PWA 27641 - Chasing Tap, Pratt & Whitney
B. Consumable Materials
(1)
B00782 Solvent - Trichlorotriflourethane, MIL-C-81302
(2)
D00009 Compound - Antiseize, MIL-M-7866, Powdered Molykote Type Z
(3)
D00373 Lubricant - Thread, PMC 9936, Parker Thread Lube
(4)
D00390 Oil - Engine
(5)
G00834 Cloth - Cotton, Lint-free
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