(2)  
Access Panels
 5737/5837 Fan Cowl Assy
 5738/5838 Thrust Reverser Cowl Assy
 5739/5839 Thrust Reverser Cowl Assy
 5746/5846 Fan Cowl Assy

 C.  Prepare to Remove the Precooler Control Valve
 S 864-002
 WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC DUCT BEFORE YOU
_______ REMOVE A PNEUMATIC SYSTEM COMPONENT. THE HOT HIGH PRESSURE AIR CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)
Release the pressure in the pneumatic system (AMM 36-05-00/201).

 S 864-003

 (2)  
Open the BLEED AIR circuit breaker on the P6 Main Power Distribution Panel and attach a DO-NOT-CLOSE tag.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL
PRECOOLER CONTROL VALVEPRECOOLER (REF) SEE A THRUST LINK
FWD
A
MANUAL
WRENCHING

CONTACT SEAL
DRIVE

ASSEMBLY
1
POSITION
INDICATOR

PRECOOLER
CONTROL VALVE

COUPLING
E-SEAL

BOLT
ENGINE FAN

WASHER BLEED AIRNUTAIR INLET PRECOOLER
DUCT
A

FWD
A
NOT INSTALLED ON ALL AIRPLANES1
Precooler Control Valve Installation Figure 401 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

T/R (REF)
Precooler Control Valve Installation
Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 014-004
 (3)  Open the left and right fan cowl panels (AMM 71-11-04/201).
 S 014-005
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  Open the thrust reversers (AMM 78-31-00/201).
 D. Remove the Precooler Control Valve
 S 034-006
 (1)  
Remove the connector for the braided flex sense line from the right side of the precooler control valve.

 S 034-007

 (2)  
Remove the connector for the rigid sense line from the left side of the precooler control valve.

 S 034-008

 (3)  
Loosen the B-Nut at the lower end of the rigid sense line.

 (a)  Move the rigid sense line out of the work area.
 S 034-009
 (4)  Remove the clamp from the PRSOV sense line which is on the left side of the precooler.
 (a)  Move the PRSOV sense line out of the work area.
 S 034-010
 (5)  Remove the forward attach bolt for the thrust link.
 NOTE: The attach bolt is on the left side of the engine.
____
 (a)  Lower the thrust link.
 NOTE: The thrust link will lower approximately one inch.
____
 S 034-011
 (6)  
Remove the forward and aft clamps on the PRSOV.

 (a)  Lower the PRSOV.

 (7)
Remove the clamp on the forward end of the precooler control valve.

 S 034-012
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