B.
Special Tools and Equipment

 (1)
Puller - PWA 86081 (For removal of the AP-10 Plug Assembly)

 (2)
Guide Tube - PWA 86411, AP-8 Port (for the flexible borescope)

 C.
Consumable Materials

 (1)  
G00964 Antigalling compound - Fel Pro C-200

 (2)  
B00299 Petroleum Solvent P-D-680, Type I

 (3)  
D00244 Antiseize compound, high temperature -Silver Goop

 D.
References

 (1)  
AMM 72-00-00/201, Engine

 E.
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

 F.
Do the HPT Blade and Vane Inspection.

 (1)  
Do this task: Prepare for the Borescope Inspection.

 S 846-155-N00
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 72-00-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
No. 17 - HPT (1st- and 2nd-Stage) Blade and Duct Segments, and (1st-Stage)
__________________________________________________________________________ Vane Inspection
_______________
 S 016-156-N00
 (2)  Remove the plugs from the access ports AP-8 and AP-9 of the combustion chamber (Refer to Fig. 608 and 614 for the access port locations and borescope data).
 NOTE: The six AP-8 plugs are found on the diffuser case at 45, 128,
____ 172, 225, 277, and 338 degrees clockwise from the top center of the engine from the rear view.
 (a)  
Measure the AP-9 plug shaft diameter.

 (b)  
If the shaft diameter minimum dimension is less than 0.100 inch

 (2.54 mm), the plug must be replaced.
 S 416-199-N00
 (3)  
Do the steps that follow to install the PWA Guide Tube:

 (a)  
Put the PWA 86411 Guide Tube through the diffuser case access port at the AP-8 location with the tip pointed forward (in the direction of the front of the engine).

 (b)  
Turn and adjust the tube until the flexible borescope, when it is installed, will point in the direction of the 1st-stage NGV (nozzle guide vanes).

 (c)  
Lock the Guide Tube in the correct position with the compression nut.

 S 016-157-N00
 (4)  
Remove the plugs from the access ports AP-10 of the HPT LPT transition duct, and AP-11 of the HPT (Refer to Fig. 608 and 623 for the access port locations and borescope data).

 (a)  
Remove the two bolts which attach the AP-10 plug assembly to the case (Fig. 623).

 (b)  
Use a PWA 86081 Puller to remove, as an assembly, the AP-10 plug, the plug stop, the spring washer, and the cotter pin.

 NOTE: Do not remove the cotter pin.
____
 (c)  
Discard the gasket.

 (d)  
ENGINES WITH BORESCOPE PLUG AP-11; Remove the borescope plug and gasket from the No. 3 TVBCA (turbine vane cooling air) duct AP-11 as follows: 1) Remove the bolts that attach the borescope plug to the aft

 elbow of the No. 3 TVBCA duct. 2) Remove the plug with two jackscrews if it is necessary, discard the gasket.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
COMBUSTION CHAMBER (REF)
SEE A
1ST-STAGE
HPT VANE
ACCESS PORT AP-9
FWD
BORESCOPE
BURNER LINING (REF)
CONCAVE AIRFOIL
(PRESSURE SIDE)

INNER DIAMETER PLATFORM (BUTTRESS)
TRAILING EDGECOOLING AIR HOLES 1ST-STAGE HPT
　
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