S 862-032
WARNING: MAKE SURE YOU RELEASE THE PNEUMATIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. THE PNEUMATIC SYSTEM PRESSURIZES THE HYDRAULIC RESERVOIR. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
(3) Release the pressure in the pneumatic system (AMM 36-00-00/201).
S 862-033
WARNING: MAKE SURE YOU RELEASE THE HYDRAULIC SYSTEM PRESSURE BEFORE YOU
_______ OPEN THE HYDRAULIC SYSTEM. HYDRAULIC FLUID THAT HAS PRESSURE CAN CAUSE INJURY TO PERSONS.
(4)
Release the pressure in the hydraulic system (AMM 29-11-00/201).
S 022-034
(5)
Remove the pressure filter element:
(a)
Loosen the filter bowl to remove it from the pressure module. 1) Discard the packings and the backup rings.
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747-400
MAINTENANCE MANUAL
(b)
On the pressure module of the Sterer type, Remove the filter from the module fitting. 1) Discard the filter.
(c)
On the pressure module of the Ronson/Hydraulic type, Remove the retainer ring from the bowl. 1) Remove the filter. 2) Discard the filter.
TASK 29-11-23-402-117
5. Pressure Filter Element Installation (Fig. 201)
____________________________________
A. Consumable Materials
(1)
D00153 Fluid - Hydraulic, Fire Resistant, BMS 3-11
B.
References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 54-62-00/201, Nacelle Strut Access Panels
(4)
IPC 29-11-23 Fig. 1
C.
Access
(1)
Location Zone
454 System 1 - Strut Aft Fairing
464 System 2 - Strut Aft Fairing
474 System 3 - Strut Aft Fairing
484 System 4 - Strut Aft Fairing
(2)
Access Panel 454AL Trailing Edge Fairing Doors - System 1 464AL Trailing Edge Fairing Doors - System 2 474AL Trailing Edge Fairing Doors - System 3 484AL Trailing Edge Fairing Doors - System 4
D.
Procedure
S 642-038
(1)
Lubricate the packings, the backup rings, and the component threads with hydraulic fluid.
S 422-110
(2)
Install the pressure filter element:
(a)
Install the packings and the backup rings in the pressure module.
(b)
On the pressure module of the Sterer type, Install the filter bowl: 1) Put the open end of the filter element in the pressure
module. 2) Push the element tightly on the fitting. 3) Install the filter bowl on the pressure module. 4) Tighten the filter bowl to 430-530 pound-inches
(50-60 N.m).
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747-400 MAINTENANCE MANUAL
(c) On the pressure module of the Ronson/Hydraulic type, Install the filter bowl: 1) Install the filter element and the retainer ring in the
filter bowl. 2) Install the filter bowl on the pressure module. 3) Tighten the filter bowl to 800-900 pound-inches
(90-95 N.m).
(d) Install a lockwire on the filter bowl.
S 862-043
(3)
Pressurize the hydraulic system with the engine-driven pump and the demand pump (AMM 29-11-00/201).
S 792-111
(4)
Examine the pressure module for leakage.
(a)
If you find leakage, repair the cause of the leak.
S 862-044
(5) Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 412-046
CAUTION: MAKE SURE YOU LATCH THE DOORS ON THE TRAILING EDGE FAIRING
_______ CORRECTLY. IF THE DOORS OPEN DURING A FLIGHT, THIS CAN CAUSE DAMAGE TO THE DOORS.
(6)
Close the left door on the applicable trailing edge fairing (AMM 54-62-00/201).
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