S 424-023
 (1)  
Install the hydraulic pump ELCU:

 (a)  
Install the ELCU in the power panel and align the screw holes.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-20
 ALL  ú ú 02 Page 404 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (b) (c)  Install the four mounting screws. 1) Tighten the screws.Remove the six terminal nuts and washers from the terminal studs on the ELCU.
 CAUTION:_______ MAKE SURE EACH TERMINAL WIRE IS CONNECTED TO THE CORRECT TERMINAL STUD ON THE ELCU. AN INCORRECT INSTALLATION CAN CAUSE A CIRCUIT MALFUNCTION AND DAMAGE TO THE EQUIPMENT.
 MAKE SURE THE WASHERS ARE INSTALLED BETWEEN THE TERMINAL NUT AND THE WIRE. DO NOT INSTALL THE WASHERS BELOW THE WIRES. THIS WILL CAUSE A HIGH RESISTANCE WHICH CAN CAUSE HEAT DAMAGE TO THE ELCU TERMINALS.
 (d) (e) (f)  Connect the six terminal wires to their correct terminal studs on the ELCU.Install the six terminal nuts and the washers. 1) Tighten the nuts to between 115 and 125 Pound-Inches.Connect the applicable electrical connector (DM3370 or DM3371) to the ELCU.
 (2)  S 414-016Close the applicable panel (P515 or P614) door.
 (3)  S 864-017Remove the DO-NOT-OPERATE tag from the BATTERY switch on the P5 panel.
 (4)  S 864-018Supply electrical power (AMM 24-22-00/201).
 (5)  S 714-024Do a test of the ACMP operation: (a) Pressurize the applicable hydraulic system with the applicable ACMP (AMM 29-11-00/201). (b) Push the HYD button on the EICAS display select panel.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-20
 ALL  ú ú 01 Page 405 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (c)  
Make sure the pressure for the applicable hydraulic system is between 2850-3200 psi.

 (d)  
Release the pressure in the hydraulic system
 (AMM 29-11-00/201).

 S 864-021
 (6)  Remove the electrical power if it is not necessary for other operations (AMM 24-22-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-20
 ALL  ú ú 01 Page 406 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HEAT EXCHANGER - REMOVAL/INSTALLATION
_____________________________________
 1.  General_______
 A.  This procedure contains the tasks to remove and install the heat
 exchanger for the hydraulic system.

 B.  The heat exchanger is in the inboard aft corner of each of the four primary fuel tanks. It is necessary to go into the fuel tank to remove and install the heat exchanger. The hydraulic tube connections go through the rear wing spar.
 C.  On systems 1 and 4, get access to the tube connections through the access panel forward of the inboard aileron. On systems 2 and 3, get access to the tube connections through the applicable wheel well for the wing landing gear.
 TASK 29-11-22-004-001
 2.  Heat Exchanger Removal (Fig. 401)______________________
 A.  References
 (1)
AMM 06-09-08/201, Wing Access Doors and Panels

 (2)
AMM 24-22-00/201, Manual Control

 (3)
AMM 28-11-00/201, Fuel Tanks

 (4)
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (5)
AMM 28-26-00/201, Defueling

 (6)
AMM 29-11-00/201, Main Hydraulic Supply System

 (7)
AMM 36-00-00/201, Pneumatic System

 (8)
AIPC 29-11-22, Fig. 2 (Outboard)

 (9)
AIPC 29-11-22, Fig. 4 (Inboard)

 B.  
Access

 (1)  
Location Zone 546 System 1-Outboard Main Tank, Mid Spar to Rear Spar 544 System 2-Inboard Main Tank, Mid Spar to Rear Spar 644 System 3-Inboard Main Tank, Mid Spar to Rear Spar 646 System 4-Outboard Main Tank, Mid Spar to Rear Spar
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 液壓 HYDRAULIC 2(36)