3.

 (f)  
Put the power switch to the OFF position and remove the test probes.

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A
747-400
MAINTENANCE MANUAL

 S 764-171
 (3)  
Do an analysis of the test results:

 (a)  
If each resistance measured between pin 4 and pins 1, 2 and 3 is equal to or more than 5 megohms, then the fuel pump resistance check is satisfactory. 1) If the insulation check is satisfactory, do these steps:

 a)  Connect the electrical connector for the motor/impeller unit.

 (b)  
If any resistance measured between pin 4 and pins 1, 2, and 3 is below 1 megohm, do these steps: 1) Replace the boost pump motor/impeller unit. 2) Do the continuity/resistance checks again for the

 replacement fuel pump.
 a) Start with this procedure: Fuel Pump Continuity Check.

 (c)  
If any resistance measured between pin 4 and pins 1, 2, and 3 is between 1 and 5 megohm, do these steps: 1) It is recommended that the boost pump motor/impeller unit

 be replaced. 2) If the boost pump motor/impeller unit is not replaced, continue to do the insulation resistance checks.
 NOTE: Do the checks of the fuel pumps at the maintenance
____ interval in SB 747-28A2194, Revision 1 (every A-check).
 S 974-176
 (4)  Keep the 747 Fuel Pump Inspection Data Sheet for your records (Fig. 403).
 NOTE: It is not necessary to send the data sheets to Boeing.
____
 S 764-146
 (5)  Do this task: Main Tank Boost Pump Operational Test
 TASK 28-22-03-704-175
 5.  Motor/Impeller Unit Operational Test
____________________________________
 A.  References
 (1)  
AMM 12-11-01/301, Fuel Servicing

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 27-81-00/201, Leading Edge Flap System

 (4)  
AMM 32-00-30/201, Landing Gear Door Locks

 (5)  
SSM 28-22-03, 28-22-04

 (6)  
WDM 28-22-31, WDM 28-22-32, WDM 28-22-33, WDM 28-22-34

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747-400
MAINTENANCE MANUAL

 (7)  
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

 (8)  
Access Panels
 545CB Boost Pump Access Door
 545DB Boost Pump Access Door
 645CB Boost Pump Access Door
 645DB Boost Pump Access Door

 B.
Operational Test

 S 864-029
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 654-030

 (2)  
Refuel the applicable main fuel tank (AMM 12-11-01/301).

 S 864-031

 (3)  
Remove the DO-NOT-CLOSE tags and close the applicable circuit breakers:

 (a)  
P180, DC Power Distribution Panel 1) 180E4, FUEL BOOST PMP CONT AFT 1 & FWD 4 2) 180E19, FUEL BOOST PMP CONT FWD 1 & AFT 4 3) 180H4, FUEL BOOST PMP CONT AFT 2 & FWD 3 4) 180H19, FUEL BOOST PMP CONT FWD 2 & AFT 3

 (b)  
P414, Power Distribution Center - Left
 1) 414B5, FUEL BOOST PUMP MAIN AFT 1
 2) 414R18, FUEL BOOST PUMP MAIN AFT 2
 3) 414J5, FUEL BOOST PUMP MAIN FWD 3
 4) 414A8, FUEL BOOST PUMP MAIN FWD 4

 (c)  
P415, Power Distribution Center - Right
 1) 415B35, FUEL BOOST PUMP MAIN FWD 1
 2) 415G29, FUEL BOOST PUMP MAIN FWD 2
 3) 415M29, FUEL BOOST PUMP MAIN AFT 3
 4) 415A35, FUEL BOOST PUMP MAIN AFT 4

 
　
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