(a)  Using a small diameter grinder or file, carefully remove unwanted material from the transition duct heatshield.
 NOTE: Remove only that unwanted material that is necessary
____ to make sure that the heatshield is flush or almost flush with the 0.548 inch (13.919 mm) diameter outer transition duct borescope hole. Do not increase the diameter of the borescope hole greater than 0.060 inch (1.524 mm) maximum.
 S 418-008-N00
 (7)  Install the AP-10 borescope plug (AMM 72-00-00/601).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
TURBINE EXHAUST CASE - MAINTENANCE PRACTICES
____________________________________________
 1.  General
_______
 A.  This procedure gives the steps to examine the No. 4 bearing compartment and to replace the No. 4 bearing oil nozzle, oil pressure, and scavenge tubes.
 B.  The No. 4 bearing compartment is in the rear inner flange of the turbine exhaust case. The turbine exhaust case is attached to the external rear flange of the low pressure turbine (LPT) case.
 C.  You must open the core cowl panels and remove the turbine sleeve and plug, and the No. 4 bearing compartment cover to get access to the No. 4 bearing compartment.
 TASK 72-54-01-102-001-N00
 2.  No. 4 Bearing Compartment and Tube Inspection and Cleaning
__________________________________________________________
 A.  Equipment
 (1)  
Jackscrews - 0.190-32 (8 to 10 each), for the removal of the No. 4 bearing compartment cover (Engines with PWA SB 72-385)

 (2)  
M303, M305 or M307 Bergen Mechanical Crimper
 Bergen Cable Technologies Inc
 170 Gregg St

 P.
 O. Box 1300
 Lodi, NJ 07644-9982

 B.  
Consumable Materials

 (1)  
D00137 Oil - Engine (PWA 521B)

 (2)  
G01869 Brush - Tube (Nylon Bristle)

 (3)  
G02334 Lockwire, (P05-289) 0.032 inch (0.813 mm) - As3214-02

 (4)  
G02332 Ferrule, Safety Cable (P05-292)

 (5)  
G02335 Cable, Safety (P05-291)

 (6)  
G00964 Compound - Antigalling (PWA 586)

 (7)  
D00406 Compound - Antigalling (PWA 550)

 C.  
References

 (1)  
AMM 71-11-06/201, Core Cowl Panels

 (2)  
AMM 72-00-00/601, Engine Gaspath

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(3)  
AMM 72-54-05/401, No. 4 Bearing Compartment Cover

 (4)  
AMM 78-11-02/401, Turbine Exhaust Plug

 (5)  
AMM 78-31-00/201, Thrust Reverser System

 (6)  
AMM 79-21-10/601, Magnetic Chip Detector

 D.
Access

 (1)  
Location Zones
 412 Engine 1 - Engine
 422 Engine 2 - Engine
 432 Engine 3 - Engine
 442 Engine 4 - Engine

 E.
Procedure

 S 042-002-N00
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______
 PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL
 OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS
 OR DAMAGE TO EQUIPMENT.

 (1)  
Do the deactivation procedure for the thrust reverser for ground
 maintenance (AMM 78-31-00/201).

 S 012-003-N00

 (2)  
Open the core cowl panels (AMM 71-11-06/201).

 S 012-006-N00

 (3)  
Remove the turbine exhaust plug (AMM 78-11-02/401).

 S 012-005-N00

 (4)  
Remove the No. 4 bearing shield and cover (AMM 72-54-05/401).
　
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