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747-400 MAINTENANCE MANUAL
 6) Loosen the fuel supply tube again and then tighten to 675-750 inch-pounds (76.3-84.8 newton-meters). 7) Disconnect the fuel supply tube from the nipple on the fuel pump. 8) Remove the anti-seize compound from the threads of the nipple and fuel supply tube with a cloth. 9) Lubricate the threads of the nipple and fuel supply tube with a light coat of engine oil. 10) Connect the fuel supply tube to the nipple on the fuel pump. 11) Tighten the fuel supply tube to 900-1000 inch-pounds (101.7-113.0 newton-meters).
 S 642-375
 CAUTION:_______ DO NOT LET THE LUBRICANT TOUCH THE CONDUCTORS IN THE TWO
 IGNITION CABLES.  A HIGH RESISTANCE BETWEEN THE TWO IGNITER
 PLUGS AND IGNITION EXCITER WILL RESULT IN DAMAGE TO THE TWO

 IGNITION CABLES.
 (9)  
Lightly apply the spray lubricant to the seal seat area at the ends of the two ignition cables (5).

 S 422-376

 (10)
 Connect the two ignition cables (5) to the ignition exciter (6).

 CAUTION: DO NOT LET THE BRAIDS OR FERRULES OF THE TWO IGNITION
_______ CABLES MOVE WHEN YOU TIGHTEN THE TWO COUPLING NUTS. DAMAGE TO THE TWO IGNITION CABLES CAN OCCUR.
 (a)  Tighten the two coupling nuts with your fingers plus 1/8 of a turn.
 S 422-377
 (11)
 Connect the electrical connector D95006 (P6) (7) to the ignition exciter (6).

 (a)  
Tighten the coupling ring on the electrical connector D95006 (P6) (7) until the electrical connector is at the bottom of the receptacle and the connection is tight.

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 (b)  Make sure the electrical connection is not loose when you move the APU harness.
 S 862-115
 (12)
 Remove the DO-NOT-CLOSE tags and install collars on these circuit breakers:

 (a)  
P6-2 Main Power Distribution Panel
 1) 6K18, APU ALTN CONT

 (b)  
P83 Aft APU Equipment Control and Circuit Breaker Panel 1) APU PRIME CONT

 S 862-280
 (13)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6 Main Power Distribution Panel
 1) 6H18, APU DC FUEL PUMP

 (b)  
P180 DC Power Distribution Panel
 1) 180H4, FUEL BOOST PUMP CONT AFT 2 & FWD 3

 (c)  
P414 Power Distribution Center - Left Panel
 1) 414R18, FUEL BOOST PUMP MAIN AFT 2

 

 S 862-116
 (14)
 Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.

 S 932-134

 (15)
 Attach a preservation tag, that has the date of preservation on it, to the APU control switch.

 S 622-096

 (16)
 Make sure the humidity in the APU does not go higher than 40 percent:

 (a)  
Put the dessicant bags and the humidity indicators in the inlet duct and the exhaust duct of the APU.

 (b)  
Install plugs, caps, and covers on all the APU ports and the openings.

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 (c) (d) (e)  Supply windows such that you can see the humidity indicators.Examine the humidity indicators each fourteen days if the airplane is in an open area.Examine the humidity indicators each 30 days if the airplane is in a closed area.
　
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