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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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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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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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
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