S 724-173
(18)
Do this task: Fuel Boost Pumps - Insulation Resistance Check
S 724-206
(19)
Do this task: Fuel Boost Pumps - Insulation Resistance Check.
NOTE: If the boost pump is removed for inspection and that
____ boost pump is re-installed at the same location from which it was removed, then the insulation resistance (IR) inspection is not necessary.
TASK 28-22-03-204-156
4. Fuel Boost Pumps - Insulation Resistance Check
______________________________________________
A. General
(1)
This task does an on-wing insulation resistance check of the boost pumps.
(a)
Do this task each time you install a boost pump (new or serviceable).
(b)
If the boost pump is removed for inspection and that boost pump is re-installed at the same location from which it was removed, then the insulation resistance (IR) inspection is not necessary.
(2)
When you use the QuadTech Type 1864 megohmmeter, it is recommended that the megohmmeter be insulated from any metal work stands. It is also recommended that protective clothing (rubber gloves, insulated shoes, etc.) be worn when you make these measurements. The megohmmeter should be plugged into a grounded receptacle to reduce the possibility of electrical shock.
(3)
An insulation resistance data sheet is provided (Fig. 403). Use the provided data sheet or an equivalent. It is not necessary to send the data sheets to Boeing.
B.
Equipment
(1)
Ohmmeter:
(a)
Avtron T477W, (or equivalent)
Avtron Manufacturing Co.,
10409 Meech Ave., Cleveland, Ohio USA 44105
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FUEL BOOST PUMP
SEE A
BONDING JUMPER
WIRE BUNDLE CAP
ELECTRICAL CONNECTOR
WIRE BUNDLE A
SEE B 1
4 2
A 3
HANDLE A-A
BONDING JUMPER
FUEL BOOST PUMP (EXAMPLE)
A
Fuel Boost Pump Insulation Resistance Check Figure 402 (Sheet 1)
G54830
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
ELECTRICAL WIRE BUNDLE CAP CONNECTOR
STATOR MOTOR AND IMPELLER SUBASSEMBLY 1 2 3 4
1
BLACK
RED
2
MEGOHMMETER
3
GREEN
OHMMETERBLUE 4
BRAIDED BONDING JUMPER
WIRE BUNDLE
Fuel Boost Pump Insulation Resistance Check
Figure 402 (Sheet 2)
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ú 01 Page 413
ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G54831
A
747-400
MAINTENANCE MANUAL
747 FUEL PUMP INSPECTION DATA SHEET
AIRPLANE TAIL NBR: HRS/CYCLES: DATE:
PUMP NAME INSTALLED PUMP RESIS-OHMSINTANCEGRND RESISTANCE IN MEGOHMS(INSULATION CHECK)
PARTNBR SERIALNBR OVHL/NEWTSO/TSN 10V DC 500V DC
PIN 4 PIN 1 PIN 2 PIN 3 PIN 1 PIN 2 PIN 3
NBR 1 MAIN FWDBOOST PUMP
BOOST PUMPNBR 1 MAIN AFT
NBR 2 MAIN FWDBOOST PUMP
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