29-11-06
ALL ú ú 01 Page 405 ú Oct 18/01
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A
747-400 MAINTENANCE MANUAL
PUMP CHECK VALVE (FIREWALL-MOUNTED) - REMOVAL/INSTALLATION
__________________________________________________________
1. General_______
A. This procedure contains the tasks to remove and install a check valve for a hydraulic hose that is installed on a firewall.
B. The EDP pressure hose and the case drain hose have a check valve that is installed on a firewall. The check valves are installed in the raceway for the engine nacelle firewall.
C. It is necessary to move the seals in the strut raceway to get access to the check valves. The raceway must have a full seal to prevent the leakage of fuel and hydraulic fluid on the engine. You must permit sufficient cure time for the raceway sealant when you install the check valves.
D. You can get access to the check valves through the right thrust reverser half.
TASK 29-11-07-004-001
2. Firewall-Mounted Check Valve Removal (Fig. 401)____________________________________
A. Standard Tools and Equipment
(1)
Container - 15 U.S. gallon (60 liter) capacity
B.
References
(1)
AMM 29-11-00/201, Main Hydraulic Supply System
(2)
AMM 36-00-00/201, Pneumatic System
(3)
AMM 78-31-00/201, Thrust Reverser System
C.
Access
(1)
Location Zone 412 Engine 1 - Engine Nacelle Firewall 2:00 o'clock 422 Engine 2 - Engine Nacelle Firewall 2:00 o'clock 432 Engine 3 - Engine Nacelle Firewall 2:00 o'clock 442 Engine 4 - Engine Nacelle Firewall 2:00 o'clock
(2)
Access Panel
416 Right Thrust Reverser Half - Engine 1
426 Right Thrust Reverser Half - Engine 2
436 Right Thrust Reverser Half - Engine 3
446 Right Thrust Reverser Half - Engine 4
D.
Procedure
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29-11-07
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747-400 MAINTENANCE MANUAL
SEE A
SELF-SEALING DISCONNECT FOR THE SUPPLY HOSE
CHECK VALVE FOR THE PRESSURE HOSE
HYDRAULIC
PRESSURE HOSE
HYDRAULIC SUPPLY HOSE COVER PLATE
CHECK VALVE FOR
THE CASE HOSE
FUEL HOSE
DRAIN HOSE FOR
THE HYDRAULIC
CASE
FWD A
Pump Check Valve (Firewall Mounted) Installation Figure 401
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29-11-07
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747-400 MAINTENANCE MANUAL
S 864-002
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.
(1)
Release the pneumatic system pressure (AMM 36-00-00/201).
S 864-021
(2)
Operate the bleed valve on the pressurization module to release the pressure in the reservoir (AMM 29-11-00/201).
S 864-003
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.
(3)
Release the pressure in the hydraulic system (AMM 29-11-00/201).
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