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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 496-006
 WARNING:_______DO THE PROCEDURE IN AMM 27-81-00/201 TO INSTALL THE LOCKS. THE FLAPS CAN MOVE QUICKLY AND CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Install the safety locks on the leading edge flaps (AMM 27-81-00/201).

 S 866-007

 (4)  
Make sure the landing gear ground locks are installed.

 S 496-031
 WARNING: USE THE PROCEDURE IN AMM 32-00-30/201 TO INSTALL THE DOOR
_______ LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  Install the wing and body gear door locks (AMM 32-00-30/201).
 S 496-030
 CAUTION: PUT A PLYWOOD SHEET OR EQUIVALENT ABOVE THE PRESSURE RELIEF
_______ PANEL ON THE WING INBOARD LEADING EDGE. DO THIS STEP BEFORE YOU DO A CHECK OF THE FORWARD BOOST PUMPS FOR THE NO. 2 AND 3 MAIN TANKS. DAMAGE TO THE PRESSURE RELIEF PANEL COULD OCCUR IF THERE IS NO PROTECTION.
 (6)  
Put a plywood sheet above the pressure relief panel on the inboard leading edge.

 S 866-002

 (7)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  
P414 Power Distribution Center - Left
 1) 414A8 FUEL BOOST PUMP MAIN FWD 4
 2) 414B5 FUEL BOOST PUMP MAIN AFT 1
 3) 414C2 FUEL OVRD/JTSN PUMP FWD 2
 4) 414C5 FUEL OVRD/JTSN PUMP FWD 3
 5) 414D2 FUEL OVRD/JTSN PUMP CTR LEFT
 6) 414J5 FUEL BOOST PMP MAIN FWD 3
 7) 414R18 FUEL BOOST PUMP MAIN AFT 2

 (b)  
P415 Power Distribution Center - Right
 1) 415B35 FUEL BOOST PUMP MAIN FWD 1
 2) 415A35 FUEL BOOST PUMP MAIN AFT 4
 3) 415M32 FUEL OVRD/JTSN PUMP CTR RIGHT
 4) 415A38 FUEL OVRD/JTSN PUMP AFT 2
 5) 415B38 FUEL OVRD/JTSN PUMP AFT 3
 6) 415M29 FUEL BOOST PUMP MAIN AFT 3
 7) 415G29 FUEL BOOST PUMP MAIN FWD 2

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747-400 MAINTENANCE MANUAL
 F. 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 826-057
 (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)  
Set the function switch to MEASURE.

 (j)  
Adjust the SET "infinity symbol" HIGHEST RANGE dial until the meter shows the infinity symbol.

 (k)  
Connect the test probes to the megohmmeter.

 G.
Fuel Pump Wire Terminal Assembly Inspection

 NOTE: It is necessary to do these four procedures at each pump:
____
 -
Fuel Pump Wire Terminal Assembly Inspection

 -
Fuel Pump Continuity Check

 -Initial Insulation Resistance Check
 -Final Insulation Resistance Check
 S 016-011
 (1)  Go out to each fuel pump location.
　
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