(e)  
Lubricate the threads of the bolts, which attach the TVC air duct, with engine oil.

 (f)  
Attach the TVC air duct to the pads on the TVBCA valve port and on the HPT case with the bolts. 1) Use the larger bolts at the aft flange. 2) Tighten the bolts with your hand.

 (g)  
Lubricate the threads of the bolts, which attach the clamp on the TVC air duct, with engine oil.

 (h)  
Put the clamp on the TVC air duct.

 (i)  
Attach the clamp to the bracket on the diffuser case with the bolts and nuts. 1) Tighten the bolts to 85-95 pound-inches (9.6-10.7

 newton-meters).

 (j)  
Tighten the bolts, from one corner to the opposite corner, at the forward flange to 85-95 pound-inches (9.6-10.7 newton-meters). 1) Without loosening, tighten the bolts again until the

 necessary torque is kept.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 75-24-02
 ALL  ú ú N05 Page 426 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(k)  Tighten the bolts, from one corner to the opposite corner, at the aft flange to 180-200 pound-inches (20.3-22.6 newton-meters). 1) Without loosening, tighten the bolts again until the
 necessary torque is kept. 2) Safety the bolts with lockwire or safety cable and safety cable ferrule.
 F. Return the Aircraft to its Usual Condition
 S 414-132-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00 WHEN YOU CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Close the left thrust reverser (AMM 78-31-00/201).

 S 414-133-N00

 (2)  
Close the left core cowl panel (AMM 71-11-06/201).

 S 414-134-N00

 (3)  
Close the left fan cowl panel (AMM 71-11-04/201).

 S 444-135-N00

 (4)  
Do the activation procedure for the thrust reverser
 (AMM 78-31-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 75-24-02
 ALL  ú ú N01 Page 427 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
HIGH PRESSURE TURBINE CASE COOLING AIR SHUTOFF VALVE -
______________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General_______
 A.  The procedure that follows gives tasks for the removal and installation of the shutoff valve for the turbine case cooling of the high pressure turbine (HPT).
 B.  The shutoff valve is found on the case of the low pressure turbine (LPT) at the 2 o'clock position. It is between the inlet duct for cooling air and the cooling collector of the HPT case.
 C.  You must remove the shutoff valve for LPT case cooling before you remove the shutoff valve for HPT case cooling.
 TASK 75-24-03-004-001-N00
 2.  High Pressure Turbine Case Cooling Air Shutoff Valve Removal (Fig. 401)____________________________________________________________
 A.  References
 (1)  
AMM 75-24-04/401, Low Pressure Turbine Case Cooling Air Shutoff Valve

 (2)  
IPC 75-24-00 Fig. 15

 (3)  
IPC 75-24-03 Fig. 10

 (4)  
IPC 75-24-11 Fig. 1

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - LPT Case 2 o'clock
 422 Engine 2 - LPT Case 2 o'clock
 432 Engine 3 - LPT Case 2 o'clock
 442 Engine 4 - LPT Case 2 o'clock

 (2)  
Access Panel
 418 Right Core Cowl Panel - Engine 1
 428 Right Core Cowl Panel - Engine 2
 438 Right Core Cowl Panel - Engine 3
 448 Right Core Cowl Panel - Engine 4

 C.  
Procedure

 S 014-002-N00
 (1)  Do this task for the applicable engine: "Remove the LPT Case Cooling Air Shutoff Valve" (AMM 75-24-04/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 大氣 AIR 1(64)