29-11-17
 ALL  ú ú 03 Page 509 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 215-171
 (12)
 Increase the EDP pressure.

 S 215-107

 (13)
 Make sure the pressure indication, for the applicable hydraulic system, on the EICAS status display, is approximately 3000 psig.

 S 215-096

 (14)
 Make sure the MASTER CAUTION lights, for the captain and the first officer, on the glare shield panel, P10, are on.

 S 215-097

 (15)
 Make sure you can see these messages on the EICAS display: HYD PRESS SYS - (1,2,3,4 as applicable) HYD PRESS DEM - (1,2,3,4 as applicable) HYD PRESS ENG - (1,2,3,4 as applicable)

 S 865-108

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

 S 865-109

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

 S 215-110

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

 S 215-168

 (19)
 Set the EDP switch to OFF.

 S 215-169

 (20)
 Slowly decrease the EDP pressure to 1350 psig (AMM 29-11-00/201).

 S 215-112
 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.
 (21)
 Make sure the ADP operates.

 S 215-113

 (22)
 Make sure the PRESS light, for the demand pump in the applicable system, is off.

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 29-11-17
 ALL  ú ú 01 Page 510 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 215-114
 (23)
 Make sure the hydraulic pressure indication, on the EICAS status display, becomes stable between 2900-3150 psig.

 S 215-115

 (24)
 Make sure the ADP operates continuously for not less than 30 seconds.

 S 215-170

 (25)
 Set the EDP switch to ON.

 S 865-116

 (26)
 Slowly increase the EDP pressure.

 S 215-117

 (27)
 Monitor the PRESS light, for the engine-driven pump, until this light goes off.

 S 215-118

 (28)
 Make sure the ADP stops approximately 15 seconds after the PRESS light, for the engine-driven pump, goes off.

 S 865-119

 (29)
 Put the flap control lever, on the first officer's side of the aisle stand, to 5 units.

 S 215-120

 (30)
 Make sure the ADP, in the applicable hydraulic system, operates while the trailing edge flaps move.

 S 215-121

 (31)
 Make sure the ADP, in the applicable hydraulic system, stops immediately after the trailing edge flaps stop.

 S 865-122

 (32)
 Put the applicable HYD PUMPS DEMAND switch in the OFF position.

 S 865-123

 (33)
 Open these circuit breakers:

 (a)  
P7 Overhead Circuit Breaker Panel 1) 7F22 LANDING GEAR DSP & CONT PRI 2) 7F23 LANDING GEAR DSP & CONT ALTN

 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.

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