(e)
Connect the pressure hose and the case drain hose to the EDP.
S 212-121
(10)
Examine the differential pressure indicator that monitors the case drain filter for the EDP.
(a)
If the indicator is extended, replace the element for the case drain filter (AMM 29-11-18/201).
S 612-122
(11)
Do this task: "Hydraulic Reservoir Servicing" (AMM 12-12-01/301).
S 862-123
(12)
Pressurize the hydraulic system with the EDP (Ref par. 4).
S 792-124
(13)
Examine all the connections for the pressure hose and the case drain hose for leakage.
(a)
If you find leakage, repair the cause of it.
S 862-125
(14) Release the pressure in the hydraulic system (Ref par. 5).
S 412-128
CAUTION: MAKE SURE YOU LATCH THE FAIRING DOORS ON THE TRAILING EDGE
_______ CORRECTLY. DAMAGE CAN OCCUR IF THE DOORS OPEN DURING A FLIGHT.
(15)
Close the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
(16)
Close the right thrust reverser half (AMM 78-31-00/201).
S 412-129
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-11-00
ALL ú ú 13 Page 235 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
TASK 29-11-00-102-131
10. Flush a Demand Pump Pressure Line and Case Drain Line_____________________________________________________
A. Standard Tools and Equipment
(1)
Container - 1 U.S. Gallon (4 Liter) capacity, for hydraulic fluid
(2)
Hydraulic Service Cart - This cart must provide a flow of BMS 3-11 fire-resistant hydraulic fluid at 30-40 gpm at 500-700 psig.
B.
References
(1)
AMM 12-12-01/301, Hydraulic Systems
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-06/401, Pump-Mounted Check Valves
(4)
AMM 29-11-18/201, Case Drain Module
(5)
AMM 29-11-23/201, Pressure Module
(6)
AMM 54-62-00/201, Nacelle Strut Access Panels
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
(1)
Supply electrical power (AMM 24-22-00/201).
(2)
Release the pressure in the hydraulic system (Ref par. 5).
S 012-134
(3)
Open the fairing doors on the trailing edge of the strut (AMM 54-62-00/201).
S 862-132
S 862-133
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
29-11-00
ALL ú ú 12 Page 236 ú Oct 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 032-135
(4)
Disconnect the pressure hose and the case drain hose from the demand pump.
S 962-136
(5)
Disassemble the check valves:
(a)
Do the steps which follow for the check valves, for the pressure and case drain, at the demand pump (AMM 29-11-06/401): 1) Remove the check valve. 2) Remove the poppet valve from the check valve. 3) Remove all contamination from the check valve. 4) Assemble the check valve without the poppet valve. 5) Install the check valve.
(b)
Do the steps which follow for the check valve, for the demand pump, in the pressure module (AMM 29-11-23/201): 1) Remove the check valve. 2) Disassemble the check valve. 3) Remove all contamination from the check valve. 4) Assemble the check valve. 5) Install the check valve.
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