(f)
Connect the forward end of the PT4.95 pressure tube to the adapter aft of the Flange N. 1) Tighten the tube nut with your hand.
(g)
Connect the aft end of the PT4.95 pressure tube to the tube nut at the turbine exhaust case. 1) Tighten the tube nut with your hand.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(h)
Lubricate the threads of the attaching bolts for the tube clamps with engine oil.
(i)
Install the two bolts that attach the clamps for the oil vent tube for the No. 3 bearing and the PT4.95 pressure tube (View AV).
(j)
Install the three bolts and nuts that attach the clamps for the oil vent tube for the No. 3 bearing and the PT4.95 pressure tube (Views AW, AX, AY).
(k)
Tighten the tube nuts of the vent tube for the No. 3 bearing to 200-225 pound-inches (22.5-25.4 newton-meters). 1) Safety the tube nuts with lockwire or safety cable and
safety cable ferrule.
(l)
Tighten the tube nuts of PT4.95 pressure tube to 200-225 pound-inches (22.5-25.4 newton-meters). 1) Safety the tube nuts with lockwire or safety cable and
safety cable ferrule.
(m)
Tighten all bolts which attach the tube clamps to 36-40 pound-inches (4.1-4.5 newton-meters).
S 414-030-N00
(6)
For the two lower aft cooling air tubes, install the lower support bracket on the Flange P with the steps that follow:
(a)
Put the lower support bracket in position on the aft face of the Flange P.
(b)
Install the support bracket with the bolts and nuts.
1) Tighten the bolts to 180-200 pound-inches (20.3-22.6 newton-meters).
S 414-077-N00
(7)
ENGINES POST-PW-SB 79-76; For the lower cooling air tubes, install the pressure tubes for the No.4 bearing with the steps that follow:
(a)
Remove the protection caps from the open ends of the pressure tubes for the No.4 bearing.
(b)
Lubricate the packing for the strainer element with engine oil (View AA).
(c)
Install the packing to the groove in the strainer element.
(d)
Lubricate the threads of the strainer element with engine oil.
(e)
Install the strainer element in the strainer housing.
1) Tighten the strainer element with your hand.
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(f)
Lubricate the threads of the strainer housing with engine oil.
(g)
Install the strainer housing to the internal tube-nut on the turbine exhaust case at the approximately 7 o'clock position. 1) Tighten the tube nut with your hand.
(h)
Put the forward pressure tube for the No. 4 bearing in position on the engine.
(i)
Connect the forward tube nut of the pressure tubes for the No. 4 bearing (View AL). 1) Tighten the tube nut with your hand.
(j)
Put the rear pressure tube for the No. 4 bearing in position on the engine.
(k)
Connect the rear pressure tube for the No. 4 bearing to the middle tube nut and to the strainer housing (Views AA and AK). 1) Tighten the tube nuts with your hand.
(l)
Install the three bolts and nuts that attach the clamps for the pressure tubes for the No. 4 bearing (Views AB, AG and AH). 1) Tighten the bolts by hand.
(m)
Install the six bolts that attach the clamps for the pressure tubes for the No. 4 bearing (Views AC, AD, AF, AJ and AI). 1) Tighten the bolts with your hand.
(n)
Hold the strainer housing and tighten the strainer element to 150-170 pound-inches (16.9-19.2 newton-meters). 1) Safety the strainer element with lockwire or safety cable
and safety cable ferrule. 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 大气 AIR 1(106)
