(a)  
Make sure six minutes have gone by since the last APU start.

 (b)  
Disconnect the electrical connector D95006 (P6) (7) from the ignition exciter (6).

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747-400 MAINTENANCE MANUAL
 CAUTION: DO NOT LET THE BRAIDS OR FERRULES OF THE TWO IGNITION
_______ CABLES MOVE WHEN YOU LOOSEN THE TWO COUPLING NUTS. DAMAGE TO THE TWO IGNITION CABLES CAN OCCUR.
 (c)  Loosen the two coupling nuts on the two ignition cables (5) until you can disconnect the ignition cables.
 S 482-368
 (5)  
Install the oil flush cart:

 (a)  
Put the container below the fuel pump and flow divider and dump valve (4).

 (b)  
Disconnect the fuel supply tube from the fuel pump.

 (c)  
Do these steps to disconnect the fuel pressure tube (2) from the flow divider and dump valve (4): 1) Disconnect the fuel pressure tube (2) from the flow divider

 and dump valve (4). 2) Remove the transfer tube (3) and two packings (1). a) Discard the two packings (1). 3) Drain the fuel from the fuel pressure tube (2) into the container.
 CAUTION: BE VERY CAREFUL NOT TO LET UNWANTED MATERIAL INTO THE APU
_______ FUEL SYSTEM. THE EQUIPMENT MUST BE SUPPLIED WITH THE CORRECT FILTERS NO ROUGHER THAN 10-MICRONS.
 (d)  Connect the oil flush cart to the fuel pump inlet.
 S 172-111
 (6)  
Apply the preservation oil at 5-25 psig (34-172 kPa) and a minimum temperature of 60°F (16°C).

 S 862-112

 (7)  
Do these steps to dry motor the APU:

 (a)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers: 1) P6-2 Main Power Distribution Panel a) 6K18, APU ALTN CONT

 2)  P83 Aft APU Equipment Control and Circuit Breaker Panel a) APU PRIME CONT

 (b)  
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.

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 (c)  
Set the APU control switch to the START position and then release to the ON position.

 (d)  
Dry motor the APU until the preservation oil comes out the end of the fuel pressure tube (2) for the flow divider and dump valve and then set the APU control switch to the OFF position.

 NOTE: Make sure you obey the duty cycles for the starter motor
____
 in table 201.

 (e)  
Make sure the APU control switch on the P5 overhead panel is OFF and attach a DO-NOT-OPERATE tag.

 (f)  
Open these circuit breakers and attach DO-NOT-CLOSE tags: 1) P6-2 Main Power Distribution Panel a) 6K18, APU ALTN CONT

 2)  P83 Aft APU Equipment Control and Circuit Breaker Panel a) APU PRIME CONT
 S 082-372
 (8)  
Remove the oil flush cart:

 (a)  
Disconnect the oil flush cart from the fuel pump inlet.

 (b)  
Do these steps to connect the fuel pressure tube (2) to the flow divider and dump valve (4): 1) Lubricate the two new packings (1) with a light coat of

 fuel. 2) Install the two packings (1) on the transfer tube (3). 3) Install the transfer tube (3) on the flow divider and dump
 valve (4).
 4)  Connect the fuel pressure tube (2) to the flow divider and dump valve (4). a) Tighten the coupling nut on the fuel pressure tube (2)
 to 320-350 inch-pounds (36.2-39.6 newton-meters).
 (c)  Do these steps to connect the fuel supply tube to the nipple on the fuel pump: 1) Apply a thin layer of anti-seize compound on the threads of
 the nipple on the fuel pump and fuel supply tube. 2) Make sure there is no anti-seize compound in the nipple and fuel supply tube. 3) Connect the fuel supply tube to the nipple on the fuel pump. 4) Tighten the fuel supply tube to 675-750 inch-pounds (76.3-84.8 newton-meters). 5) Loosen the fuel supply tube and then tighten to 675-750 inch-pounds (76.3-84.8 newton-meters).
　
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