(2)  
IPC 24-51-02 Fig. 2, IPC 24-51-02 Fig. 3

 (3)  
SSM 29-12-02, 29-12-03

 (4)  
WDM 29-11-22, 29-11-23

 B.  
Access

 (1)  
Location Zone 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel
 P515 Generator 3 Power Center - Right
 P614 Generator 2 Power Center - Left

 C.  
Procedure

 (1)  
Remove the electrical power from the airplane (AMM 24-22-00/201).

 S 864-003

 (2)  
Make sure the BATTERY switch on the P5 panel is OFF and attach a DO-NOT-OPERATE tag.

 (3)  
Open the applicable panel (P515 or P614) to get access to the ELCU.

 S 864-002
 S 014-004
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A

747-400
MAINTENANCE MANUAL

SEE A
SEE B
P515 GENERATOR 3 POWER 
CENTER-RIGHT PANEL 
M3371 HYDRUALIC 
PUMP ELCU 
SEE  C  ELCU UTILITY POWER  FWD 
GALLEY FEEDER 
ELCU 

P615 GENERATOR 4 POWER
CENTER-RIGHT PANEL

A
Hydraulic Pump Electrical Load Control Unit (ELCU) Installation Figure 401 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
GENERATOR 1 POWER CENTER-LEFT PANEL, P514
GALLEY FEEDER 
ELCU 
UTILITY POWER 
ELCU  HYDRAULIC 
FWD  PUMP ELCU, 
M3370  GENERATOR 2 POWER 
SEE  C  CENTER-LEFT PANEL, P614 
B 

TERMINAL NUT (6 LOCATIONS)
TERMINAL WASHER (6 LOCATIONS) 
ELCU (4 LOCATIONS) MOUNTING SCREW 
C 

Hydraulic Pump Electrical Load Control Unit (ELCU) Installation
Figure 401 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 024-022
 (4)  
Remove the hydraulic pump ELCU:

 (a)  
Disconnect the electrical connector (DM3370 or DM3371) from the applicable ELCU.

 (b)  
Remove the six terminal nuts and the washers that connect the six terminal wires to the ELCU. 1) Disconnect the terminal wires. 2) Identify each of the six wires that connect to the

 applicable ELCU for installation.

 (c)  
Install the terminal nuts and the washers. 1) Tighten the nuts with your fingers.

 (d)  
Remove the four mounting screws that attach the ELCU to the power panel.

 (e)  
Remove the ELCU from the power panel.

 TASK 29-11-20-404-010
 3.  Hydraulic Pump Electrical Load Control Unit (ELCU) Installation (Fig. 401)_______________________________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
IPC 24-51-02 Fig. 2, IPC 24-51-02 Fig. 3

 (3)  
SSM 29-12-02, 29-12-03

 (4)  
WDM 29-11-22, 29-11-23

 B.
Access

 (1)  
Location Zone 117 Electrical and Electronics Compartment, LH 118 Electrical and Electronics Compartment, RH

 (2)  
Access Panel
 P515 Generator 3 Power Center - Right
 P614 Generator 2 Power Center - Left

 C.
Procedure
　
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