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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
TURBINE COOLING SYSTEM - INSPECTION/CHECK
_________________________________________
 1.  General
_______
 A.  The procedure that follows gives a task for the inspection of the turbine components of the cooling system for damage. The procedure also includes steps to examine the system to see if it is attached correctly.
 B.  Open each half of the thrust reverser to get to the turbine components of the cooling system.
 TASK 75-24-00-206-001-N00
 2.  Examine the Turbine Cooling System (Fig. 601)
__________________________________
 A.  Equipment
 (1)
Air pressure source - adjustable from 100 to 500 psi.

 B.  
References

 (1)
FIM 71-CMCS Message Index

 (2)
AMM 71-00-02/401, Power Plant

 (3)
AMM 71-11-04/201, Fan Cowl Panels

 (4)
AMM 71-11-06/201, Core Cowl Panels

 (5)
AMM 72-34-03/401, Fan Exit Liner Segment

 (6)
AMM 75-24-01/401, Turbine Vane and Blade Cooling Air Valve

 (7)
AMM 75-24-02/401, Turbine Vane Cooling Air Ducts

 (8)  
AMM 75-24-03/401, High Pressure Turbine Case Cooling Air Shutoff Valve

 (9)  
AMM 75-24-04/401, Low Pressure Turbine Case Cooling Air Shutoff Valve

 (10)
 AMM 75-24-05/401, Turbine Case Cooling Air Valve Actuator

 (11)
 AMM 75-24-06/401, High Pressure Turbine Case Cooling Collector

 (12)
 AMM 75-24-07/401, High Pressure Turbine Case Cooling Manifolds

 (13)
 AMM 75-24-08/401, Low Pressure Turbine Case Cooling Collector

 (14)
 AMM 75-24-09/401, Low Pressure Turbine Case Cooling Manifolds

 (15)
 AMM 75-24-11/401, Turbine Case Cooling Air Valve Control Cable

 (16)
 AMM 75-33-02/401, PS3 Air Filter Assembly

 (17)
 AMM 75-33-03/401, HPC Secondary Flow Control Valve and Turbine Vane and Blade Cooling Air Valve Solenoid

 (18)
 AMM 78-31-00/201, Thrust Reverser System

 C.  
Access

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

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
TVBCA VALVE SEE D
SEE C
SEE ASEE B
FWD  TVC AIR DUCTS A INTERMEDIATE CASE  SEE  E  (12 LOCATIONS) SUPPORT BRACKET 
FWD 
TVBCA VALVE SOLENOID B 
Turbine Cooling System (Left Side) Figure 601 (Sheet 1) 

F01111
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
NO. 2
NO. 1
PWA 85986
COVERS FOR A
REMOVED TVCA DUCT

PS3 AIR
FILTER

LEFT 2.9 BLEED VALVE (REF)
FWD
C
NO. 3 TVC AIR DUCT
VISUAL POSITION NO. 3 TVC
INDICATOR AIR DUCT
L-A4239 0688
ENGINES WITH ENGINES WITHOUTLEFT TVBCA VALVE
BORESCOPE PLUG BORESCOPE PLUG DE
Turbine Cooling System (Left Side)
Figure 601 (Sheet 2)

F01114
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
　
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