C.  
For external thermal relief valves, you must remove the relief valve assembly first before you can replace the valve cartridge.

 TASK 32-44-09-004-001
 2.  Thermal Pressure Relief Valve Removal (Fig. 401)
_____________________________________
 A.  References
 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 32-00-30/201, Landing Gear Door Locks

 (5)  
IPC 32-44-04 Fig. 1

 B.  
Access

 (1)  
Location Zone
 138 Body Landing Gear Well - Right

 C.  
Prepare for the Removal

 S 494-030
 WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1) Install the ground locks in all landing gear (AMM 09-11-00/201).
 S 494-031
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Do this task: "Installation of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-44-09
 ALL  ú ú 02 Page 401 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

INBOARD BULKHEAD  SEE  A 
RIGHT BODY GEAR 
WHEEL WELL 
MOTOR 
OPERATED 
SHUTOFF 
VALVE 

CONNECTOR ELECTRICAL 
FWD THERMAL VALVE RELIEF  MODULE BRAKE PARKING  VALVE CHECK  HYDRAULIC LINE HYDRAULIC LINE THERMAL PRESSURE RELIEF VALVE  THERMAL PRESSURE RELIEF VALVE CARTRIDGE (2 LOCATIONS) BOLT, WASHER 
A  1

PARKING 
BRAKE 
1  PARKING BRAKE MODULES WITH  MODULE 
INTERNAL THERMAL RELIEF VALVE, 
RELIEF VALVE NOT INSTALLED 
ON ALL AIRPLANES 
2  PARKING BRAKE MODULES WITH  A  2 

EXTERNAL THERMAL RELIEF VALVE
Thermal Pressure Relief Valve Installation
Figure 401

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-44-09
 ALL  ú ú 01 Page 402 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 494-032
 (3)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 S 864-004

 (4)  
Supply electrical power (AMM 24-22-00/201).

 S 864-005

 (5)  
Make sure this circuit breaker is closed:

 (a)  
P6 Main Power Distribution Panel
 1) 6L18 PARK BRAKE

 S 864-006
 (6)  
Install chocks at all wheels.

 S 864-007

 (7)  
Release the parking brake.

 S 214-008

 (8)  
Make sure that the PARKING BRAKE ON indication does not show on the EICAS.

 S 864-009

 (9)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  
P6 Main Power Distribution Panel
 1) 6L18 PARK BRAKE

 S 864-011
 (10)
 Remove pressure from hydraulic system 4 (AMM 29-11-00/201).

 S 864-012

 (11)
 Do these steps to release hydraulic fluid from the brake
 accumulator:

 (a)  
Look at the HYD BRAKE PRESS gage on the captain's instrument panel.

 (b)  
Push on the brake pedals fully 10 times.

 (c)  
Make sure the pressure does not decrease the last time you operate the brake pedals.

 D.
Procedure

 S 024-040
 (1)  
　
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