(f)
Attach the plug stop to the access port boss with the bolts.
(g)
Tighten the bolts to 54-60 pound-inches (6.1-6.8
newton-meters).
(h)
Install lockwire on the AP-10 plug.
(6)
Do this task: Put the Airplane Back to its Usual Condition.
S 416-171-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 19 - LPT Blades (3rd-Stage) Inspection
__________________________________________
TASK 72-00-00-206-203-N00
19. LPT Blades (3rd-Stage) Inspection_________________________________
A. General
(1) This inspection is the visual check of the 3rd-stage blades in the primary gaspath of the LPT.
CAUTION: USE CAUTION WHEN YOU USE THIS PROCEDURE TO MAKE A DECISION
_______ ABOUT THE CONDITION OF THE ENGINE. THE BORESCOPE INSPECTION LIMITS ARE A RESULT OF TESTS AND STRUCTURAL ANALYSIS. THE PART LIFE AND THE PERFORMANCE OF THE ENGINE CAN DECREASE QUICKLY WHILE THE DAMAGE OF THE PARTS BECOMES NEAR TO THE MAXIMUM CONTINUE-IN-SERVICE LIMITS.
(2)
The limits in this section will help you find if the engine can continue to operate or if you must remove and repair it.
B.
Special Tools and Equipment
(1)
Puller - PWA 86081 (For removal of the AP-10 Plug Assembly)
C.
Consumable Materials
(1)
B00776 Petroleum Solvent P-D-680, Type I
(2)
D00244 Antiseize compound, Silver Goop
D.
Access
(1)
Location Zone
412 Engine 1 - Engine
422 Engine 2 - Engine
432 Engine 3 - Engine
442 Engine 4 - Engine
(2)
Access Panel 415 and 416 Thrust Reverser Halves - Engine 1 425 and 426 Thrust Reverser Halves - Engine 2 435 and 436 Thrust Reverser Halves - Engine 3 445 and 446 Thrust Reverser Halves - Engine 4
E.
Do the LPT Blade Inspection.
(1)
Do this task: Prepare for the Borescope Inspection.
S 016-173-N00
(2)
Remove the plug from the LPT HPT access port AP-10 (Refer to Fig. 608 and Fig. 623 for the access port location and the borescope data).
(a)
Remove the two bolts that attach the plug stop to the case (Fig. 623).
S 846-172-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
No. 19 - LPT Blades (3rd-Stage) Inspection
__________________________________________
(b) Use a PWA 86081 Puller to remove, as an assembly, the plug, the plug stop, the spring washer, and the cotter pin; discard the gasket.
NOTE: Do not remove the cotter pin.
____
S 296-174-N00
WARNING: DO NOT USE THE POWER CABLE OF THE BORESCOPE IF YOU FIND
_______ CIRCUMFERENTIAL CUT HOLES, FRAYING, OR BROKEN HOLES IN THE EXTERNAL RUBBER COVERING ON THE CABLE. POWER CABLES WITH THOSE CONDITIONS CAN CAUSE INJURY TO PERSONS.
CAUTION: MAKE SURE THE TEMPERATURE OF THE INSPECTION AREAS ARE BELOW
_______ 150°F (65.6°C) BEFORE YOU USE THE BORESCOPE. IF THE CASES ADJACENT TO THE INSPECTION AREAS ARE TOO HOT TO KEEP YOUR HAND ON, YOU CAN CAUSE DAMAGE TO THE BORESCOPE.
(3)
Put the borescope through the access port to examine the 3rd-stage LPT blades for nicks, dents, cracks, and other FOD.
S 226-328-N00
(4)
If there has been a sudden increase in EGT, check for a possible missing or liberated LPT 3rd-stage outer transition duct segment.
(a)
No missing or liberated outer transition duct segments are permitted.
S 226-204-N00
CAUTION: IF YOU FIND DAMAGE THAT IS MORE THAN THE CONTINUE-IN-SERVICE
_______ LIMITS, OR PIECES OF THE VANE WILL FALL OFF, REMOVE THE ENGINE IMMEDIATELY. THIS TYPE OF DAMAGE CAN CAUSE MORE DAMAGE TO THE ENGINE IF IT IS NOT REPAIRED.
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本文链接地址：747-400 AMM 飞机维护手册 发动机 ENGINE 1(94)
