Avtron Manufacturing Co.,
 10409 Meech Ave., Cleveland, Ohio USA 44105

 (2)  
Megohmmeter

 (a)  
QuadTech 1864, (or equivalent): A special megohmmeter is necessary to do the electrical check with the fuel pump installed on the airplane. The megohmmeter must have 10 VDC and 500 VDC voltage supply options with a maximum short circuit currrent of 5 milliamperes. The QuadTech model 1864 megohmmeter is recommended.

 QuadTech (OPK96) 100 Nickerson Road Marlborough, Massachusetts USA 01752-4696 Phone: (800) 253-1230
 NOTE: Test equipment for the low voltage on-wing safety check
____ (initial check) must be limited to a maximum short circuit power dissipation of 0.05 Watts. Test equipment for the high voltage on-wing check (final check) must be limited to a maximum short circuit power dissipation of
 2.5 Watts.
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747-400
MAINTENANCE MANUAL

OVERRIDE/
JETTISON PUMP BOOST PUMP

SEEA  SEEA

BONDING JUMPER
WIRE BUNDLE CAP
ELECTRICAL CONNECTOR
WIRE BUNDLE
A
SEEB  1
42
A 3
HANDLE
A-A
BONDING JUMPER
FUEL PUMP (EXAMPLE)
A
Fuel Pump Insulation Resistance CheckFigure 601 (Sheet 1)
F57728
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A

747-400
MAINTENANCE MANUAL

ELECTRICAL WIRE BUNDLE CAP CONNECTOR

SUBASSEMBLY MOTOR AND IMPELLER STATOR  4 3 2 1 

1
BLACK
RED
2
3
GREEN
BLUE 4
WIRE BUNDLE
MEGOHMMETER

OHMMETER

BRAIDED BONDING JUMPER R

Fuel Pump Insulation Resistance Check
Figure 601 (Sheet 2)

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F57772
A
747-400
MAINTENANCE MANUAL

 (3)
Plywood sheet, approximately 48 x 24 x 1/2 inch

 C.
References

 (1)
AMM 24-22-00/201, Manual Control

 (2)
AMM 27-81-00/201, Leading Edge Flap System

 (3)
AMM 28-22-03/401, Main Tank Boost Pump Motor/Impeller Unit

 (4)
AMM 28-31-01/401, Fuel Override/Jettison Pump Motor/Impeller Unit

 (5)
AMM 32-00-30/201, Landing Gear Door Locks

 (6)
CPM 20-40-00, Part 1, Corrosion Removal Techniques

 (7)
SWPM 20-20-00, Paragraph 1

 D.
Access

 (1)  
Location Zones 135 Wing Landing Gear Well, Left 136 Wing Landing Gear Well, Right 221 Control Cabin, Left 222 Control Cabin, Right 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 571 Rear Spar to Landing Gear Support Beam, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 671 Rear Spar to Landing Gear Support Beam, Right

 Access Panels
 545CB Boost Pump Access Door
 545DB Boost Pump Access Door
 645CB Boost Pump Access Door
 645DB Boost Pump Access Door

 E. Prepare for the Check
 S 866-004
 (1) Supply the electrical power if necessary (AMM 24-22-00/201).
 S 866-005
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE AND TRAILING EDGE FLAPS AND 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.
　
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