S 014-004

 (4)  
Open the right thrust reverser half on the applicable engine (AMM 78-31-00/201).

 S 034-005

 (5)  
Disconnect the hydraulic hose below the check valve.

 S 684-006

 (6)  
Drain the hydraulic fluid from the hose above the check valve:

 (a)  
Put the container below the check valve.

 (b)  
Lightly put a thin object into the end of the check valve.

 (c)  
Push against the poppet in the check valve to drain the hydraulic fluid.

 S 014-007
 (7)  
Remove the cover plate:

 (a)  
Remove the sealant from the edges of the cover plate.

 (b)  
Remove the mounting screws.

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747-400 MAINTENANCE MANUAL
 (c)  Remove the cover plate.
 S 034-008
 (8)  
Disconnect the hydraulic tube above the check valve.

 S 024-009

 (9)  
Remove the check valve:

 (a)  
Remove the sealant from the mounting bolts and the edges of the valve mounting flange.

 (b)  
Remove the bolts from the check valve.

 (c)  
Remove the check valve from the firewall.

 TASK 29-11-07-404-010
 3.  Firewall-Mounted Check Valve Installation (Fig. 401)_________________________________________
 A. Consumable Materials
 (1)  
A00429 Sealant - Hydraulic, Fire Resistant, BMS 5-63

 B.
References

 (1)  
AMM 12-12-01/301, Hydraulic Systems

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 51-31-01/201, Seals and Sealing

 (4)  
AMM 54-53-00/201, Strut Drains and Sealant

 (5)  
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

 S 394-011
 (1)  
Apply the sealant on the faying surfaces of the valve mounting flange (AMM 51-31-01/201).

 S 424-012

 (2)  
Install the check valve:

 (a)  
Put the check valve on the firewall.

 (b)  
Align the attach holes in the mounting flange with the holes in the firewall.

 (c)  
Attach the check valve with the four mounting bolts.

 S 394-013
 (3)  Apply the sealant around the attach holes on the valve mounting flange (AMM 51-31-01/201).
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747-400 MAINTENANCE MANUAL
 (4)  S 434-014Connect the hydraulic hose and the tube to the check valve.
 (5)  S 614-015Do this task:  "Hydraulic Reservoir Servicing" (AMM 12-12-01/301).
 (6)  S 864-016Pressurize the applicable hydraulic system with the EDP (AMM 29-11-00/201).
 (7)  S 214-017Examine the check valve connections for leaks. (a) If you find leakage, repair the cause of it.
 (8)  S 394-018Apply the sealant on the faying surfaces of the cover plate (AMM 51-31-01/201).
 (9)  S 414-019Attach the cover plate with the mounting screws.
 S 794-022

 CAUTION:_______MAKE SURE THE STRUT RACEWAY STRUCTURE HAS A FULL SEAL. A SEAL THAT IS NOT FULL CAN CAUSE FUEL AND HYDRAULIC FLUID LEAKAGE ON THE HOT ENGINE SURFACES.
　
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