29-11-00
 ALL  ú ú 17 Page 230 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (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 29-11-07/401, Firewall-Mounted Check Valve

 (5)  
AMM 29-11-18/201, Case Drain Module

 (6)  
AMM 29-11-23/201, Pressure Module

 (7)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (8)  
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 Aft Fairing
 422 Engine 2 - Gearbox Forward Face 5:00 o'clock
 464 System 2 - Strut Aft Fairing
 432 Engine 3 - Gearbox Forward Face 5:00 o'clock
 474 System 3 - Strut Aft Fairing
 442 Engine 4 - Gearbox Forward Face 5:00 o'clock
 484 System 4 - Strut Aft Fairing

 (2)  
Access Panel
 416 Right Thrust Reverser Half - Engine 1
 454AL Trailing Edge Fairing Doors - System 1
 426 Right Thrust Reverser Half - Engine 2
 464AL Trailing Edge Fairing Doors - System 2
 436 Right Thrust Reverser Half - Engine 3
 474AL Trailing Edge Fairing Doors - System 3
 446 Right Thrust Reverser Half - Engine 4
 484AL Trailing Edge Fairing Doors - System 4

 D.
Procedure

 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 862-100
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-00
 ALL  ú ú 21 Page 231 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 862-101
 (2)  Release the pressure in the hydraulic system (Ref par. 5).
 S 012-102
 (3)  Open the fairing doors on the trailing edge of the strut
 (AMM 54-62-00/201).
 S 012-103
 (4)  Open the right thrust reverser half (AMM 78-31-00/201).
 S 022-555
 (5)  Remove and inspect the check valves:
 (a) Do the steps which follow for the check valves, for the
 pressure and case drain, at the EDP (AMM 29-11-06/401):
 1) Remove the check valve.
 2) Visually inspect the check valve. If you find
 contamination, remove it.
 3) Make sure check valve operates correctly. Use a nylon
 probe.
 a) Make sure the poppet moves freely.
 4) Install the check valve.
 (b) Do the above steps for the check valves, for the pressure and
 case drain of the EDP, on the engine firewall
 (AMM 29-11-07/401).
 (c) Do the steps which follow for the check valve, for the EDP, in
 the pressure module (AMM 29-11-23/201):
 1) Remove the check valve.
 2) Visually inspect the check valve. If you find
 contamination, remove it.
 3) Make sure check valve operates correctly. Use a nylon
 probe.
 a) Make sure the poppet moves freely.
 4) Install the check valve.
 (d) Do the above steps for the check valve, for the EDP, in the
 case drain module (AMM 29-11-18/201).
 S 172-243

 CAUTION: MAKE SURE YOU USE BMS 3-11 HYDRAULIC FLUID TO FLUSH THE
_______ HYDRAULIC SYSTEM. HYDRAULIC FLUID WHICH DOES NOT AGREE WITH THE BMS 3-11 SPECIFICATION CAN CAUSE CONTAMINATION OF THE HYDRAULIC SYSTEM.
 (6)  
Flush the pressure line:

 (a)  
Connect the pressure line of the hydraulic service cart to the EDP pressure hose.
　
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