S 014-017
(2)
For the check valves on the demand pump, open the fairing doors on the trailing edge of the applicable strut (AMM 54-62-00/201).
S 864-003
(3)
Release the pressure in the hydraulic system (AMM 29-11-00/201).
S 024-022
(4)
Remove the check valve:
(a)
Put the container below the check valve.
(b)
Disconnect the supply hose from the hydraulic pump.
(c)
Disconnect the applicable pressure or case drain hose.
(d)
Remove the elbow.
(e)
Remove the check valve.
TASK 29-11-06-404-006
3. Check Valve Installation (Fig. 401)________________________
A. Consumable Materials
(1)
D00153 Fluid - Hydraulic, Fire-resistant, BMS 3-11
B.
References
(1)
AMM 12-12-01/301, Hydraulic Systems
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 54-62-00/201, Nacelle Strut Access Panels
(4)
AMM 78-31-00/201, Thrust Reverser System
C.
Access
(1)
Location Zone 412 Engine 1 - Gearbox Forward Face 5:00 o'clock 454 System 1 - Strut Trailing Edge Fairing 422 Engine 2 - Gearbox Forward Face 5:00 o'clock 464 System 2 - Strut Trailing Edge Fairing 432 Engine 3 - Gearbox Forward Face 5:00 o'clock 474 System 3 - Strut Trailing Edge Fairing 442 Engine 4 - Gearbox Forward Face 5:00 o'clock 484 System 4 - Strut Trailing Edge Fairing
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A
747-400
MAINTENANCE MANUAL
(2)
Access Panel
416 Right Thrust Reverser Half - Engine 1
454A Trailing Edge Fairing Doors - System 1
426 Right Thrust Reverser Half - Engine 2
464A Trailing Edge Fairing Doors - System 2
436 Right Thrust Reverser Half - Engine 3
474A Trailing Edge Fairing Doors - System 3
446 Right Thrust Reverser Half - Engine 4
484A Trailing Edge Fairing Doors - System 4
D.
Procedure
S 424-023
(1)
Install the check valve:
(a)
Lubricate the threads of the elbow, the check valve, and the hose with hydraulic fluid.
(b)
Install the elbow on the check valve.
1) Install a lockwire on the elbow.
(c)
Connect the check valve assembly to the hose.
NOTE: Hold the fitting to make sure it does not turn.
____
(d)
Connect the hose to the pump.
(e)
Tighten the hose connection to the applicable torque value: 1) EDP pressure hose: 1140-1260 pound-inches (126-138 N.m) 2) ADP pressure hose: 1140-1260 pound-inches (126-138 N.m) 3) ACMP pressure hose: 855-945 pound-inches (94-103 N.m) 4) EDP case drain hose: 475-525 pound-inches (53-57 N.m) 5) ADP case drain hose: 475-525 pound-inches (53-57 N.m) 6) ACMP case drain hose: 475-525 pound-inches (53-57 N.m).
S 864-010
(2)
Pressurize the hydraulic system with the EDP, the ADP, or the ACMP, whichever is applicable (AMM 29-11-00/201).
S 794-011
(3)
Examine the hose and connections for leakage.
(a)
If you find leakage, repair the cause of it.
S 864-012
(4)
Remove the hydraulic power if it is not necessary for other operations (AMM 29-11-00/201).
S 414-013
(5)
For the EDP check valves, close the thrust reverser half
(AMM 78-31-00/201).
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