(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 172-121
(6)
Apply the preservation oil at 5-25 psig (34-172 kPa) and a minimum temperature of 60°F (16°C).
S 862-122
(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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
49-11-00
ALL ú ú 02 Page 256 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b)
Remove the DO-NOT-OPERATE tag from the APU control switch on the P5 overhead panel.
(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 082-374
(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). 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.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
49-11-00
ALL ú ú 02 Page 257 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
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).
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：747-400 AMM 飞机维护手册 机载辅助动力 1(36)
