(7)
AMM 71-11-04/201, Core Cowl Panels

 (8)
AMM 73-11-01/401, Fuel Pump

 D.
Access

 (1)  
Location Zones
 131 Center Section Wing Box, Left
 132 Center Section Wing Box, Right
 500 Left Wing
 600 Right Wing

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MAINTENANCE MANUAL

 (2)  Access Panels 545AB Fuel Tank Access Door 545CB Fuel Tank Access Door 545DB Fuel Tank Access Door 546BB Fuel Tank Access Door 552AB Fuel Tank Access Door 552BB Fuel Tank Access Door 552CB Fuel Tank Access Door 552DB Fuel Tank Access Door 552EB Fuel Tank Access Door 552FB Fuel Tank Access Door 553BB Fuel Tank Access Door 553CB Fuel Tank Access Door 553DB Fuel Tank Access Door 553EB Fuel Tank Access Door 553FB Fuel Tank Access Door 553GB Fuel Tank Access Door 553HB Fuel Tank Access Door 553JB Fuel Tank Access Door 645AB Fuel Tank Access Door 645CB Fuel Tank Access Door 645DB Fuel Tank Access Door 646BB Fuel Tank Access Door 652AB Fuel Tank Access Door 652BB Fuel Tank Access Door 652CB Fuel Tank Access Door 652DB Fuel Tank Access Door 652EB Fuel Tank Access Door 652FB Fuel Tank Access Door 653BB Fuel Tank Access Door 653CB Fuel Tank Access Door 653DB Fuel Tank Access Door 653EB Fuel Tank Access Door 653FB Fuel Tank Access Door 653GB Fuel Tank Access Door 653HB Fuel Tank Access Door 653JB Fuel Tank Access Door
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747-400 MAINTENANCE MANUAL
 E. Prepare for Inspection
 S 656-002
 (1)  
Defuel the fuel tanks (AMM 28-26-00/201).

 S 866-061

 (2)  
Remove the left and right scavenge system fuel strainers from the rear spar (AMM 28-15-00/201).

 NOTE: Air can leak out of the fuel-feed manifold through the
____ scavenge system if the fuel strainers are not removed.
 S 016-039
 (3)  
Open the core cowls to get to the fuel pumps on engines No. 1 thru 4 (AMM 71-11-06/201).

 S 656-043

 (4)  
Do these steps to drain the fuel from the main fuel supply line for engines No. 1 thru 4 (AMM 73-11-01/401).

 (a)  
Remove the drain plug from the engine fuel pump.

 (b)  
Drain the fuel into the container.

 (c)  
Remove and discard the O-ring from the drain plug.

 (d)  
Install the drain plug after you have drained the fuel.

 (e)  
Use a new O-ring lubricated with the petrolatum.

 (f)  
Tighten the drain plug to 45-55 pound-inches
 (5.1-6.2 Newton-meters).

 (g)  
Install the lockwire on the drain plug.

 S 656-045
 (5)  Install the air pressure leak check equipment:
 NOTE: Use one of these equipment set-ups:
____ -G28018 air pressure equipment or,
 -Air pressure check equipment set-up at the engine fuel pump (Fig. 602).
 (a)  If available install the G28018 equipment at the fuel quick-disconnect (service disconnect panel). 1) Connect the G28018 pressure check equipment to the air
 pressure source at engine No. 1.
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747-400 MAINTENANCE MANUAL
 2)  Install the G28018 test equipment at engines No. 2, 3 and
 4.

 (b)  
To install the air pressure check equipment set-up at the applicable engine fuel pump, do these steps (AMM 73-11-01/401). 1) Disconnect the main fuel supply line from the engine fuel

 pump.
　
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