B.
Equipment
(1)
Ohmmeter
(a)
Avtron T477W, (or equivalent):
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 current 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
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747-400
MAINTENANCE MANUAL
D. Access
(1)
Location Zones 135 Wing Landing Gear Well, Left 136 Wing Landing Gear Well, Right 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 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
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 824-188
(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.
(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.
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747-400 MAINTENANCE MANUAL
F. Fuel Pump Wire Terminal Assembly Inspection
NOTE: It is necessary to do these four procedures if you install a
____
replacement override/jettison pump:
-
Fuel Pump Wire Terminal Assembly Inspection
-
Fuel Pump Continuity Check
-Initial Insulation Resistance Check
-Final Insulation Resistance Check
S 864-189
(1) Go to the location where you replaced the override/jettison pump.
NOTE: Refer to Table 401 for pump location.
____
~................................................................. | | Ovrd/Jett. | | Override/Jettison Pump Access | Pump | | | Number | ................................................................... | Wing Landing Gear Wheel Well, Left | Left Center | | Wing Landing Gear Wheel Well, Right | Right Center| | Wing Landing Gear Wheel Well, Left | MAIN 2 FWD | | Wing Landing Gear Wheel Well, Left | MAIN 2 AFT | | Wing Landing Gear Wheel Well, Right | MAIN 3 FWD | | Wing Landing Gear Wheel Well, Right | MAIN 3 AFT | 2...................................................….............1
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