Fuel Boost Pump Inspection Data Sheet
Figure 403
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G54843
A
747-400
MAINTENANCE MANUAL
(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.
C. References
(1)
CPM 20-40-00, Part 1, Corrosion Removal Techniques
(2)
SWPM 20-20-00, Paragraph 1
D.
Access
(1)
Location Zones 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 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
(2)
Access Panels
545CB Boost Pump Access Door
545DB Boost Pump Access Door
645CB Boost Pump Access Door
645DB Boost Pump Access Door
E.
Calibrate the QuadTech Model 1864 Megohmmeter Procedure
NOTE: Do this procedure before you do the resistance checks and each
____ time the megohmmeter is moved. This is necessary to make sure the megohmmeter is calibrated correctly and the adjustment knobs have not accidentally been moved.
S 824-157
(1)
Do these steps to calibrate the megohmmeter:
(a)
Disconnect all of the leads from the megohmmeter (if necessary).
(b)
Make sure the megohmmeter is insulated from any metal work stands.
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747-400 MAINTENANCE MANUAL
(c)
Make sure that you wear protective clothes (rubber gloves, insulated shoes, etc.)
(d)
Put the power switch to the POWER position.
(e)
Put the function switch to the DISCHARGE position.
(f)
Put the multiplier dial to any range setting.
(g)
Adjust the SET "infinity symbol" dial until the meter shows the infinity symbol.
(h)
Set the multipler dial to the 10-1T range.
(i)
Put the function switch to the MEASURE position.
(j)
Adjust the SET "infinity symbol" HIGHEST RANGE dial until the meter shows the infinity symbol.
(k)
Connect the test probes to the megohmmeter.
F.
Fuel Pump Wire Terminal Assembly Inspection
NOTE: It is necessary to do these four procedures if you install a
____
replacement boost pump:
-
Fuel Pump Wire Terminal Assembly Inspection
-
Fuel Pump Continuity Check
-Initial Insulation Resistance Check
-Final Insulation Resistance Check
S 864-158
(1) Go to the location where you replaced the boost pump.
NOTE: Refer to Table 401 for pump location.
____
~................................................................. | | | | Boost Pump Access | Boost Pump | | | Number | ................................................................... | Boost Pump Access Door, 545CB | MAIN 1 FWD | | Boost Pump Access Door, 545DB | MAIN 1 AFT | | Left Wing Fuselage Fairing, Access Door, 511FB | MAIN 2 FWD | | Wing Landing Gear Wheel Well, Left | MAIN 2 AFT | | Right Wing Fuselage Fairing, Access Door, 611FB | MAIN 3 FWD | | Wing Landing Gear Wheel Well, Right | MAIN 3 AFT | | Boost Pump Access Door, 645CB | MAIN 4 FWD | | Boost Pump Access Door, 645DB | MAIN 4 AFT | 2...................................................….............1
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