B.  
References

 (1)
71-11-04/201, Fan Cowl Panels

 (2)
71-11-06/201, Core Cowl Panels

 (3)
78-31-00/201, Thrust Reverser System

 (4)
IPC 79-21-06 Fig. 1

 C.  
Access

 (1)  
Location Zone 412 Engine 1 - Main Gearbox Fwd Face 8 o'clock 422 Engine 2 - Main Gearbox Fwd Face 8 o'clock 432 Engine 3 - Main Gearbox Fwd Face 8 o'clock 442 Engine 4 - Main Gearbox Fwd Face 8 o'clock

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 D.  
Prepare to Remove the Pressure Relief Valve

 (1)
Open the left fan cowl panel (Ref 71-11-04/201).

 S 014-014-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
FUEL/OIL COOLER (REF) 
SEE  A 
FILTER HOUSING MAIN OIL BSEE 
GEARBOX MAIN (REF) 

FWD
A
PRESSURE RELIEF VALVE PACKINGS
HOUSING
PRESSURE
RELIEF

PACKING
VALVE SPRING PACKING PLUG
MAIN OIL FILTER
BOLT
B
Oil System Pressure (Regulator) Relief Valve Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 044-016-N00
 WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT THE
_______
 OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF
 THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO
 EQUIPMENT.

 (2)  
Do this procedure: Thrust Reverser Deactivation for Ground
 Maintenance (Ref 78-31-00/201).

 S 014-015-N00

 (3)  
Open the left core cowl panel (Ref 71-11-06/201).

 S 014-017-N00
 WARNING: OBEY THE INSTRUCTIONS IN 78-31-00 WHEN YOU OPEN THE THRUST
_______
 REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO
 PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

 (4)  
Open the left thrust reverser (Ref 78-31-00/201).

 E.
Remove the Pressure Relief Valve

 S 034-018-N00
 WARNING: BE VERY CAREFUL WHEN YOU REMOVE THE PLUG IN THE PRESSURE RELIEF
_______ VALVE. THE PLUG HAS A SPRING IN IT AND INJURY CAN OCCUR DURING THE REMOVAL.
 (1)  Remove the plug from the pressure relief valve.
 NOTE: Catch the oil in a container with a minimum capacity of 5
____
 U.S. gallons (19 liters).
 (a)  Discard the packing from the plug.
 S 024-019-N00
 (2)  Remove the spring and the pressure relief valve from the housing of
 the pressure relief valve.

 (a)  Discard the packing from the pressure relief valve.
 S 214-020-N00
 (3)  Examine the housing of the pressure relief valve for one of the
 coniditons that follow:

 (a)  
You see damage in the housing

 (b)  
You see leakage from the mating flange of the housing

 (c)  
You must replace the internal packings.

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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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