EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-17
 ALL  ú ú 01 Page 502 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 865-059
 (10)
 Disconnect connector DM3108 or DM7202 (as applicable) from the fuel metering unit on the applicable engine (AMM 73-21-01/401).

 S 865-016

 (11)
 Make sure that the trailing edge flaps and the flap control lever are in the UP position.

 S 865-017

 (12)
 Put the applicable HYD DEMAND PUMPS switch, on the overhead panel, P5, in the OFF position.

 S 215-018

 (13)
 Make sure the PRESS light, for the applicable demand pump, is on.

 WARNING:_______ MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
 FLAPS AND THE FLAP DRIVE MECHANISMS, BEFORE YOU MOVE THE FLAP
 CONTROL LEVER.  WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL
 MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP
 CONTROL LEVER.  THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO
 EQUIPMENT.

 S 865-019
 CAUTION: OPERATE ONLY THE SYSTEMS WITH HYDRAULIC POWER WHICH THIS TEST
_______ PROCEDURE TELLS YOU TO OPERATE. KEEP THE TEST TIME TO A MINIMUM. MONITOR THE FLUID LEVEL IN THE HYDRAULIC RESERVOIR CONTINUOUSLY. BECAUSE THE HYDRAULIC FLUID CAN NOT GO BACK TO THE HYDRAULIC SERVICE CART, THE HYDRAULIC RESERVOIR CAN BECOME TOO FULL.
 (14)
 Set the hydraulic service cart to pressurize the applicable hydraulic system to 2950 to 3050 psig, with a flow rate of 5 gpm.

 S 215-020

 (15)
 Make sure the pressure indication, for the applicable hydraulic system, on the EICAS status display, is approximately 3000 psig.

 S 865-021

 (16)
 Pressurize the pneumatic system with a ground air source (AMM 36-00-00/201).

 S 865-022

 (17)
 Put the applicable HYD DEMAND PUMPS switch, on the overhead panel P5, in the AUTO position.

 (18)
 Make sure the air-driven pump (ADP) does not operate.

 S 215-023
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-17
 ALL  ú ú 02 Page 503 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 215-024
 (19) Slowly decrease the pressure from the hydraulic test bench to 1350 psig.
 S 215-025
 CAUTION: DO NOT OPERATE THE DEMAND PUMPS FOR MORE THAN FIFTEEN MINUTES
_______ WHEN THE FUEL TANKS ARE EMPTY. THE HEAT EXCHANGERS IN THE HYDRAULIC SYSTEM USE THE FUEL TO REMOVE THE HEAT FROM THE HYDRAULIC FLUID. THE HYDRAULIC FLUID TEMPERATURE, ON THE EICAS STATUS DISPLAY, MUST NOT BECOME MORE THAN 212° F (100° C). IF THE HYDRAULIC FLUID BECOMES TOO HOT, THIS CAN CAUSE DAMAGE TO THE DEMAND PUMP.
 (20)
 Make sure the ADP operates.

 S 215-026

 (21)
 Make sure the PRESS light, for the demand pump in the applicable system, is off.

 S 215-027

 (22)
 Make sure the hydraulic pressure indication, on the EICAS status display, becomes stable between 2900-3150 psig.

 S 215-028

 (23)
 Make sure the ADP operates continuously for not less than 30 seconds.

 S 865-029

 (24)
 Slowly increase the pressure from the hydraulic service cart to 1650 psig while the ADP is in operation.

 S 215-030

 (25)
 Monitor the PRESS light, for the engine-driven pump, until this light goes off.

 S 215-031

 (26)
 Make sure the ADP stops approximately 15 seconds after the PRESS light, for the engine-driven pump, goes off.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 29-11-17
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
　
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