(11)
Do this task: Override/Jettison Pump - Insulation Resistance Check.
S 724-205
NOTE: If the override/jettison pump is removed for inspection and
____ that override/jettison pump is re-installed at the same location from which it was removed, then the insulation resistance (IR) inspection is not necessary.
TASK 28-31-01-704-187
4. Override/Jettison Pump - Insulation Resistance Check (Fig. 402, 403)
____________________________________________________
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MAINTENANCE MANUAL
OVERRIDE/JETTISON PUMPS
SEE A
WIRE BUNDLE
SEE B WIRE BUNDLE CAP
A
ELECTRICAL CONNECTOR
PULL HERE FOR
PUMP REMOVAL
A
BONDING JUMPER
OVERRIDE JETTISON PUMP (EXAMPLE)
A
1
42
3
A-A
Fuel Override/Jettison Pump Insulation Resistance Check
Figure 402 (Sheet 1)
G85749
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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 Override/Jettison Pump Insulation Resistance Check
Figure 402 (Sheet 2)
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747 FUEL OVERRIDE/JETTISON 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
OVRD/JETTISON PUMPNBR 2 MAIN FWD
OVRD/JETTISON PUMPNBR 2 MAIN AFT
OVRD/JETTISON PUMPCTR WING TANK LEFT
OVRD/JETTISON PUMPCTR WING TANK RIGHT
OVRD/JETTISON PUMPNBR 3 MAIN FWD
NBR 3 MAIN AFTOVRD/JETTISON PUMP
Fuel Override/Jettison Pump Inspection Data Sheet
Figure 403
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MAINTENANCE MANUAL
A. General
(1)
This task does an on-wing insulation resistance check of the override/jettison pumps.
(a)
Do this task each time you install an override/jettison pump (new or servicable).
(b)
If the override/jettison pump is removed for inspection and that override/jettison 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) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 燃油 FUEL 4(31)
