75-24-02
 ALL  ú ú N03 Page 404 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
2)  ENGINES WITH PHASE 3 CHANGES; Remove and discard the gasket from the front flange of the duct. a) ENGINES WITHOUT PHASE 3 CHANGES AND PRE-PW-SB 72-315 OR
 POST-PW-SB 75-57;
 Remove and discard the gasket on the boss on the HPT
 case.

 b)  ENGINES POST-PW-SB 72-315 OR WITH PHASE 3 CHANGES; Remove and discard the metering orifice seal plate from the boss on the HPT case.
 (f)  Install the protection caps to the TVC air duct, and the openings on the HPC and HPT cases.
 TASK 75-24-02-004-008-N00
 3.  Remove the No. 2 Turbine Vane Cooling Air Duct
______________________________________________
 A.  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, Thurst Reverser System

 (4)  
IPC 71-00-50 Fig. 1

 (5)  
IPC 75-20-01 Fig. 1

 (6)  
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
 416 Right Thrust Reverser Half - Engine 1
 426 Right Thrust Reverser Half - Engine 2
 436 Right Thrust Reverser Half - Engine 3
 446 Right Thrust Reverser Half - Engine 4

 C.  
Prepare to Remove the No.2 Turbine-Vane Cooling Air-Duct

 S 044-109-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 right fan cowl panel (AMM 71-11-04/201).

 S 014-108-N00
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 75-24-02
 ALL  ú ú N01 Page 405 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 014-110-N00
 (3)  Open the right core cowl panel (AMM 71-11-06/201).
 S 014-111-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 right thrust reverser (AMM 78-31-00/201).

 D.  
Procedure

 S 024-166-N00
 (1)  
Remove the No.2 turbine-vane cooling air-duct:

 (a)  
Remove the accessory cooling air tube and the tube support bracket with the steps that follow: 1) Remove the screws, nuts, and washers which attach the tube

 clamps for the support of the engine fire detector element to the tube support bracket on the flange M and flange N support brackets.
 2)  Loosen the tube nut which attaches the accessory cooling air tube to the inlet duct for the turbine case cooling air.
 3)  Loosen the tube nut at the forward end of the tee for the accessory cooling air tube.
 4)  Remove the bolts, nuts, and washers, and clamp which attach the lower end of the accessory cooling air tube to the bracket.
 5)  Remove the screw and washer which attaches the tube clamp for the accessory cooling air tube to the support bracket on the flange M and flange N support brackets.
 6)  Remove the accessory cooling air tube from the engine.
 7)  Remove the bolts, washers, and nuts which attach the tube support bracket to the flange M and flange N support brackets.
 8)  Remove the tube support bracket.
 (b)  Remove the bolts which attach the forward flange of the TVC air duct and bracket to the flange of the turbine vane and blade cooling air (TVBCA) valve on the HPC case.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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