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No. 17 - HPT (1st- and 2nd-Stage) Blade and Duct Segments, and (1st-Stage)
__________________________________________________________________________
 Vane Inspection_______________
 (d)  Fully clean the bolt threads and the plug threads with
 petroleum solvent.
 NOTE:____ This removes unwanted carbon and all the used
 antigalling compound.
 (e)  Apply a layer of Silver Goop to the threads of the bolts and
 remove the unwanted compound.
 (f)  With the bolts, attach the plug stop to the access port boss
 (Fig. 623).
 (g)  Tighten the bolts to 54-60 pound-inches (6.1-6.8
 newton-meters).
 (h)  Install lockwire on the AP-10 plug.

 S 416-200-N00
 (12)
 ENGINES WITH BORESCOPE PLUG AP-11; Install the AP-11 plug in the No. 3 TVBCA duct:

 (a)  
Install the gasket in the borescope plug groove.

 (b)  
Install the AP-11 plug at the aft elbow of the No. 3 TVBCA duct and engage the plug end in the inner hole of the HPT to seat it.

 (c)  
Install the bolts, threads lubricated with engine oil.

 (d)  
Tighten the bolts, in a sequence that is not circular, to 75-85 pound-inches (8.5-9.6 newton-meters) 1) Install lockwire on the plug.

 S 096-165-N00
 (13)
 If you installed the high pressure rotor rotator, remove it (AMM 72-00-00/201).

 S 416-201-N00

 (14)
 Do this task: Put the Airplane Back to its Usual Condition.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 18 - LPT Vanes (3rd-Stage) Inspection
_________________________________________
 TASK 72-00-00-206-202-N00
 18. LPT Vanes (3rd-Stage) Inspection________________________________
 A. General
 (1)  This inspection is the visual check of the 3rd-stage vanes 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, high temperature -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 Vane Inspection.

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

 S 016-167-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 846-166-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.

3RD-STAGE LPT VANE

L-A0598
3rd-Stage LPT Vane Continue-In-Service Limits
Figure 625

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