-
No. 2 engine fuel shutoff

 -
No. 2 fuel crossfeed

 -
No. 1 engine fuel shutoff

 -
No. 1 fuel crossfeed

 S 866-059
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (5)  
Purge and prepare to go into the main fuel tank (AMM 28-11-00/201).

 S 366-016

 (6)  
Go into the tank(s) and do a check for air leaks on the fuel-feed lines and couplings.

 S 366-031
 CAUTION: YOU CANNOT TIGHTEN THE FUEL LINE COUPLING AFTER THE INITIAL
_______ INSTALLATION. YOU MUST INSTALL NEW O-RINGS WHEN YOU TIGHTEN THE FUEL LINE COUPLING AGAIN OR A FUEL LEAK CAN OCCUR.
 (7)
If a coupling has a leak, disconnect the coupling, replace the O-rings, and then connect the coupling (AMM 28-22-07/401).

 S 366-018

 (8)  
If a fuel line has a leak, or has damage, remove and install a new fuel line (AMM 28-22-07/401).

 G.
Put the Airplane Back to Its Usual Condition

 S 876-019
 (1)  
Open the bleed valve slowly and let the pressure in the lines bleed to zero.

 S 416-020

 (2)  
Install the access doors on the fuel tank(s)
 (AMM 28-11-01/401, AMM 28-11-02/401).

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747-400 MAINTENANCE MANUAL
 S 086-021
 (3)  
Remove the pressure check equipment from the air pressure source and the inlet line to the fuel pump.

 S 436-050

 (4)
Connect the main fuel supply line to the engine fuel pump.

 (a)  
Remove the cap from the main fuel supply line.

 (b)  
Attach the main fuel supply line, the gasket and the bracket to the fuel pump.

 (c)  
Lubricate the threads of the bolts with engine oil.

 (d)  
Attach the parts with four bolts and four washers.

 (e)  
Tighten the bolts to 198 - 242 pound-inches

 (22.4 - 27.32 Newton-meters).
 S 436-026
 (5)  
Repeat these steps to install the other fuel lines.

 S 866-055

 (6)  
Install the left and right scavenge system fuel strainers (AMM 28-15-00/201).

 S 796-029

 (7)  
Do a dry engine motoring test to check for fuel line leaks in the strut area.

 (a)  
Refuel the fuel tanks with the necessary fuel quantity to do the engine motoring procedure (AMM 71-00-00/201).

 S 656-301
 (8)
Do this task: Remove the Air from the Fuel System Manifold.

 (a)  
Do this task: No. 2 - Engine Motoring (AMM 71-00-00/501).

 NOTE: The dry engine motoring test puts the fuel condition
____ lever in the run position (with the applicable FUEL CONT VALVE ENG circuit breaker in the open position). This will pressurize the fuel line to the engine fuel pump.
 TASK 28-22-07-706-200
 4. Fuel System Manifold Air Pressure Leak Check - Alternate Procedure
___________________________________________________________________
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747-400
MAINTENANCE MANUAL

APU BOOST PUMP CONTROL PRESSURE SWITCH, S548
SEE A
WING REAR SPAR
JETTISON PUMP
PUMP INLET LINE
PRESSURE SWITCH SENSE LINE
PRESSURE SWITCH FOR THE FUEL BOOST PUMP
FUEL FEED MANIFOLD
MAIN TANK NO. 2 AFT BOOST PUMP
PRESSURE SWITCH 
TEST EQUIPMENT  FOR THE APU 
FWD  INBD  SET-UP  BOOST PUMP 
SEE  B  CONTROL 

APU BOOST PUMP CONTROL
PRESSURE SWITCH, S548

A

Test Equipment Set-up
　
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