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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 042-002-N00
 (1)  If a cooling air duct for the turbine vane and blade is found to have a crack while the aircraft is away from a maintenance base, isolate the turbine cooling system with the steps that follow:
 NOTE: Operate the engine for a maximum of 50 hours or 5 cycles,
____ whichever is less, with the turbine cooling system isolated.
 (a)  
Remove the cooling air duct that has a crack in it
 (AMM 75-24-02/401).

 (b)  
Do the steps that follow to install the No. 1 blank-off cover to the cooling air valve for the turbine vane and blade or to the compressor case: 1) Lubricate the threads of the bolts with engine oil. 2) Attach the No. 1 blank-off cover to the cooling air valve

 for the turbine vane and blade or to the compressor case with the bolts. a) Tighten the bolts to 85-95 pound-inches (9.6-10.7
 newton-meters).
 (c)  Do the steps that follow to install the No. 2 blank-off cover to the turbine case: 1) Lubricate the threads of the bolts with engine oil. 2) Attach the No. 2 blank-off cover to the turbine case with
 the bolts. a) Tighten the bolts to 180-200 pound-inches (20.3-22.6 newton-meters).
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TURBINE COOLING SYSTEM - ADJUSTMENT/TEST
________________________________________
 1.  General
_______
 A.  This procedure gives the instructions for the adjustment of the control cable for the Turbine Case Cooling (TCC) and the adjuster linkage.
 B.  The instructions include the steps for the partial rig and the complete rig of the system.
 C.  Do the partial rig after you replaced or removed one or more of the components that follow:
 NOTE: You can also do the partial rig to do a check of the TCC control
____
 system.

 (1)  
The HPT air shutoff valve

 (2)  
The LPT air shutoff valve

 (3)  
The TCC air-valve actuator.

 D.
Do the complete rig of the TCC system for the conditions that follow:

 (1)  
After the replacement or the removal of the TCC air valve control-cable.

 (2)  
When you cannot adjust the TCC system with the partial rig.

 E.  
The actuator, idler arm, and lever arms are kept in rigging position during this procedure. For the partial rig this is done with undersized rigging pins and for the complete rig with standard rigging pins.

 TASK 75-24-00-835-001-N00
 2.  Turbine Case Cooling System Adjustment (Partial Rig Procedure) (Fig. 501)
______________________________________________________________
 A.  Special Tools and Equipment
 (1)  
PWA 86069 - Rig pin, Undersized (2 required), Pratt & Whitney, Commercial Products Division, 400 Main Street, East Hartford, CT 06108

 (2)  
PWA 85465 - Rig Pin, Pratt & Whitney

 NOTE: The rigging pin is contained in the PWA 85675 Rigging
____
 Pin Kit.

 (3)  PWA 101418 - Positioning Bolt/Machine Screw Pusher, Pratt & Whitney
 NOTE: This is the same part as shown below under Standard Tools and
____ Equipment. It is a standard hex head bolt No. 8-32, 1.5 inch (38 mm) minimum thread length. Either the PWA 101418 or the standard hex head bolt can be used for this procedure.
 B.  Standard Tools and Equipment
 (1)  
Bolt - Positioning, Standard Hex Head Bolt No. 8-32, 1.5 inch (38 mm) minimum thread length.

 C.  
Consumable Materials

 (1)  
D00390 Oil - Engine

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
　
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