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 28-22-00
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757 
MAINTENANCE MANUAL
 ENGINE FUEL FEED SYSTEM - INSPECTION/CHECK__________________________________________
 ú
 ú  TASK 28-22-00-206-001
 ú1.  FUEL BOOST PUMP 60B92404-5, -6 0R -7;
 ú  FUEL OVERRIDE PUMP 60B89004-8, -10 0R -12;
 Fuel Pumps - Insulation Resistance Check_________________________________________
 A.  General
 ú  (1)  The Insulation Resistance Check is not required for all fuel pumps.
 ú  Fuel boost pumps 60B92404-5, -6 or -7, and fuel override pumps
 ú  60B89004-8, -10 or -12 require the Insulation Resistance Check.
 ú  Fuel boost pumps 60B92404-8 and subsequent, or fuel override pumps
 ú  60B89004-14 and subsequent do not require the Insulation Resistance
 ú  Check.
 (2)  This task does a insulation resistance check of these fuel system
 pumps:
 (a)  Boost pumps for the main tanks
 (b)  Override/jettison pumps for the center tanks
 (3)  The insulation resistance checks can be done with the fuel pumps
 installed on the airplane or removed from the airplane.  If the fuel
 pump is removed from the airplane, you must do the insulation
 resistance check within 2 hours.
 (4)  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.
 B. Equipment
 (1)  Ohm Meter:
 (a)  Ohm Meter, Avtron T477W, (or equivalent):
 Avtron Manufacturing Co.,
 10409 Meech Ave., Cleveland, Ohio USA 44105

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757
MAINTENANCE MANUAL

Boost Pump and Override Pump Inspection
　
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