(4)  
IPC 75-24-07 Fig. 1

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - Aft HPC Case to Fwd HPT Case
 422 Engine 2 - Aft HPC Case to Fwd HPT Case
 432 Engine 3 - Aft HPC Case to Fwd HPT Case
 442 Engine 4 - Aft HPC Case to Fwd HPT Case

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 C.  
Prepare to Remove the No.4 Turbine-Vane Cooling Air-Duct

 S 044-117-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______ OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).

 (2)  
Open the left fan cowl panel (AMM 71-11-04/201).

 (3)  
Open the left core cowl panel (AMM 71-11-06/201).

 S 014-116-N00
 S 014-118-N00
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 75-24-02
 ALL  ú ú N05 Page 414 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 014-119-N00
 WARNING: OBEY THE INSTRUCTIONS IN 78-31-00 WHEN YOU OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the left thrust reverser (AMM 78-31-00/201).

 D.
Procedure

 S 024-168-N00
 (1)  Remove the No.4 turbine-vane cooling air-duct:
 (a)  
Remove the bolts which attach the forward flange of the TVC air duct to the flange of the turbine vane and blade cooling air (TVBCA) valve on the HPC case.

 (b)  
Remove the bolts which attach the aft flange of the TVC air duct to the boss on the HPT case.

 (c)  
Remove the bolts, nuts, and clamp which attach the TVC air duct to the bracket on the diffuser case.

 (d)  
Remove the TVC air duct from the engine.
 1) Discard the gaskets.

 (e)  
Install the protection caps to the TVC air duct, the opening on the HPT case, and the TVBCA valve port.

 TASK 75-24-02-404-040-N00
 6. Install the No. 1 Turbine Vane Cooling Air Duct (Fig. 401)
_______________________________________________
 A. Equipment
 (1)  
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)  
D00390 Oil - Engine

 (2)  
G00767 Wax - Paraffin, PMC 9552

 (3)  
G02334 Lockwire - AS3214-02

 (4)  
G02332 Ferrule - P05-292 (Optional)

 (5)  
G02335 Cable - Safety - P05-291 (Optional)

 C.
References

 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 (4)  
IPC 75-24-07 Fig. 1

 D.
Access

 (1)  
Location Zone
 412 Engine 1 - Aft HPC Case to Fwd HPT Case
 422 Engine 2 - Aft HPC Case to Fwd HPT Case
 432 Engine 3 - Aft HPC Case to Fwd HPT Case
 442 Engine 4 - Aft HPC Case to Fwd HPT Case

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 75-24-02
 ALL  ú ú N06 Page 415 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(2)  
Access Panel
 416 Right Thrust Reverser Half - Engine 1
 426 Right Thrust Reverser Half - Engine 2
 436 Right Thrust Reverser Half - Engine 3
　
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