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29-11-19
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A
747-400 MAINTENANCE MANUAL
S 865-083
(14)
Slowly decrease the EDP pressure to 1350 psig.
S 215-084
(15)
Make sure the ACMP operates continuously for 30 seconds.
S 865-085
(16)
Slowly increase the EDP pressure to 1650 psig, while the ACMP is in operation.
S 215-086
(17)
Monitor the PRESS light for the engine-driven pump (EDP) until this light goes off.
S 215-087
(18)
Make sure the ACMP stops approximately 15 seconds after the PRESS light for the EDP goes off.
S 985-125
(19)
Stop dry-motoring of the engine (AMM 71-00-00/201).
S 985-126
(20)
Dry-motor the applicable engine (AMM 71-00-00/201).
S 215-093
(21)
Make sure the ACMP, in the applicable system, starts immediately.
S 985-127
(22)
Stop dry-motoring of the engine (AMM 71-00-00/201).
S 085-094
(23)
Remove the jumper from connector DM3108 or DM7202 (as applicabe) on the applicable engine.
(24)
Make sure the ACMP, in the applicable system, stops immediately.
S 215-099
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747-400 MAINTENANCE MANUAL
S 485-100
(25)
Install a jumper between pins 13 and 14 of connector DM3108 or DM7202 (as applicable) on the applicable engine.
S 865-105
(26)
Put the applicable HYD DEMAND PUMPS switch, on the overhead panel, P5, in the ON position.
S 215-106
(27)
Make sure the ACMP, in the applicable system, starts immediately.
S 865-107
(28)
Put the applicable HYD DEMAND PUMPS switch, on the overhead panel, P5, in the OFF position.
S 215-108
(29)
Make sure the ACMP, in the applicable system, stops immediately.
S 865-109
(30)
Release the pressure in the hydraulic system (AMM 29-11-00/201).
S 865-110
(31)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 085-111
(32)
Remove the jumper from connector DM3108 or DM7202 (as applicabe) on the applicable engine.
S 415-121
CAUTION: MAKE SURE YOU LATCH THE DOORS ON THE TRAILING EDGE FAIRING
_______ CORRECTLY. IF THE DOORS OPEN DURING A FLIGHT, THIS CAN CAUSE DAMAGE TO THE DOORS.
(33) Close the doors on the trailing edge fairing (AMM 54-62-00/201).
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747-400 MAINTENANCE MANUAL
HYDRAULIC PUMP ELECTRICAL LOAD CONTROL UNIT (ELCU) - REMOVAL/INSTALLATION
_________________________________________________________________________
1. General_______
A. This procedure contains the tasks to remove and install the electrical load control unit (ELCU) M3370 and M3371 for the hydraulic pumps.
B. The M3370 hydraulic pump ELCU is in the P614 center-left power panel for generator No. 2. The M3371 hydraulic pump ELCU is in the P515 center-right power panel for generator No. 3.
C. The two power panels are in the electrical and the electronics
compartments.
TASK 29-11-20-004-001
2. Hydraulic Pump Electrical Load Control Unit (ELCU) Removal (Fig. 401)__________________________________________________________
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