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 (a) Examine the valve solenoid for correct installation.
 (b) If there is a loose valve solenoid, replace or tighten the
 mounting bolt(s).
 (c) Examine the valve solenoid for cracks.
 (d) Replace the valve solenoid if a crack is found
 (AMM 75-33-03/401).
 S 016-007-N00
 (5)  Remove the No. 1 segment of the fan exit liner (AMM 72-34-03/401) to
 get access to the control valve and the override solenoid for the
 air/oil heat exchanger valve of the IDG.
 S 216-008-N00
 (6)  Visually examine the control valve and the override solenoid.
 (a) Examine the override solenoid for correct installation.
 (b) If there is a loose override solenoid, replace or tighten the
 mounting bolt(s).
 (c) Examine the override solenoid for cracks.
 (d) Replace the override solenoid if a crack is found
 (AMM 75-33-04/401).
 S 216-009-N00
 (7)  Visually examine the air tubes and brackets for cracks and the
 correct installation.
 (a) If there are cracks or bends in the air tube(s) or cracks in
 the bracket(s) are found, replace the air tube(s) and
 bracket(s) as it is necessary.
 (b) The small damage on the surface of the air tube(s) is permitted
 if the operation of the system is not changed.
 (c) If there is a loose clamp(s) or bracket(s), replace or tighten
 the mounting bolt(s).
 S 416-010-N00
 (8)  Install the No. 1 and No. 7 segments of the fan exit liner
 (AMM 72-34-03/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 75-33-00
 ALL  ú ú N01 Page 607 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
E. Put the Airplane Back to Its Usual Condition.
 S 416-020-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 416-015-N00

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

 S 416-016-N00

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

 S 446-017-N00

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

 TASK 75-33-00-216-031-N00
 3. Do the Inspection of the HPC Secondary Flow Control Valves
__________________________________________________________
 A. General
 (1)  
This inspection examines the position indicators in the TCA (Turbine Cooling Air) valves, and in the TRC (Thermatic Rotor Control) valves. The valves are installed on the HPC case.

 B.
References

 (1)  
AMM 71-11-04/201, Fan Cowl Panels

 (2)  
AMM 71-11-06/201, Core Cowl Panels

 (3)  
AMM 75-33-01/401, HPC Secondary Flow Control Valve

 (4)  
AMM 78-31-00/201, Thrust Reverser System

 C.
Access

 (1)  
Location Zone 412 Engine 1 - Intermediate and HPC Forward Case 422 Engine 2 - Intermediate and HPC Forward Case 432 Engine 3 - Intermediate and HPC Forward Case 442 Engine 4 - Intermediate and HPC Forward Case

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 75-33-00
 ALL  ú ú N01 Page 608 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(2)  
Access Panel
 415 and 416 Thrust Reverser Halves - Engine 1
 425 and 426 Thrust Reverser Halves - Engine 2
 435 and 436 Thrust Reverser Halves - Engine 3
 445 and 446 Thrust Reverser Halves - Engine 4

 D.  
Prepare to Do the Inspection

 S 046-022-N00 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
　
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