(n)  
Tighten the tube nuts.

 S 414-030-N00
 (6)  For the left TVBCA valve (5), install the components that follow:
 (a)  The pressure regulating valve (AMM 36-11-19/401)
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(b)  
The intermediate to high pressure tee (AMM 36-11-01/401)

 (c)  
The intermediate pressure check valve (AMM 36-11-02/401).

 G.
Put the Aircraft Back to Its Usual Condition.

 S 414-052-N00
 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 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 thrust reversers (AMM 78-31-00/201).

 S 414-053-N00

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

 S 414-054-N00

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

 S 444-055-N00

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

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TURBINE VANE COOLING AIR DUCT - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  This procedure removes and installs the turbine vane cooling (TVC) air ducts.
 B.  There are four TVC air ducts which go between the high pressure compressor (HPC) case and the high pressure turbine (HPT) case. The TVC air ducts are identified as follows:
 No. 1 - Upper right TVC duct
 No. 2 - Lower right TVC duct
 No. 3 - Lower left TVC duct
 No. 4 - Upper left TVC duct

 C.  There are different removal and installation procedures for each TVC air duct.
 D.  You can get access to the TVC air ducts when you open the right thrust reverser for the No. 1 or No. 2 duct, and the left thrust reverser for the No. 3 or No. 4 duct.
 TASK 75-24-02-004-001-N00
 2.  Remove the No. 1 Turbine Vane Cooling Air Duct (Fig. 401)______________________________________________
 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, Thrust Reverser System

 (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
 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.1 Turbine-Vane Cooling Air-Duct

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
COOLING AIR 
INLET DUCT  NO. 1 TVC 
AIR DUCT 
SEE  B 
CLAMP 
SEE  D 
SEE  C 

ACCESSORY
COOLING
TUBE
RIGHT TURBINE VANE AND BLADE COOLING AIR (TVBCA) VALVE
　
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