VERTICAL TENSION BOLT CAN OCCUR.
5) Get the lengths of the torque wrench and adapter and use the specified torque value for the vertical tension bolts (AMM 70-23-00/201).
6) Torque the bolts a small amount more than the run-on torque.
NOTE: Let the bootstrap hold and show the load while
____ the bolts keep the mount surfaces parallel to each other. The dynamometer indications should not change since the bootstrap holds the power plant/cradle load.
7) Lift the power plant a small amount while you monitor the dynamometer values. a) Initially, lift the power plant 0.25 inch (6 mm). b) Tighten the bolts the same amount.
NOTE: The vertical tension bolts are a guide for
____ the mounts, but they do not hold the power plant loads.
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8) Continue to lift the power plant until the mount surfaces are 0.000 to 0.060 inch (0.00 to 1.52 mm) apart.
9) With the torque wrench and adapter, tighten the vertical tension bolts (1 and 2) for the forward engine mounts to 4050-4950 pound-inches (458-559 newton-meters).
10) With the torque wrench and adapter, tighten the vertical tension bolts (12) for the aft engine mounts to 3060-3740 pound-inches (346-423 newton-meters). a) Make sure all of the threads in the nut are engaged. b) Make sure all of the chamfer on the end of the bolt
comes out of the nut.
S 094-068-N00
(8) Remove the cradle with the steps that follow (Fig. 409):
(a)
Remove the quick-release pins (18) from the forward engine supports.
(b)
Disengage the aft handling adapters (14).
(c)
Lower the cradle to the transportation stand.
(d)
Attach the cradle to the transportation stand with the pins (4), clamps (3), and bolts (2) (Fig. 410).
(e)
Disconnect the hoists (2 and 11) from the cradle and the bootstrap equipment.
(f)
Remove the hoist (2 and 11).
(g)
Move the transportation stand, with the cradle, away from the power plant.
S 094-081-N00
(9)
Remove the bootstrap equipment with the steps that follow (Fig. 409):
(a)
Remove the aft load cell (1).
(b)
Remove the aft horizontal braces, arm assemblies and brackets (Fig. 407).
(c)
Remove the forward load cells (10).
(d)
Remove the forward inboard and outboard arms (5 and 6).
(e)
Remove the coupling rod (9) and forward supports (7 and 8) from the aft upper engine mount.
(10)
Install the bolts (1) in the two sides of the strut (Fig. 408).
S 434-093-N00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
TASK 71-00-02-404-157-N00
7. Install the Power Plant With the PT90-E
_______________________________________
NOTE: The PT90-E installation procedure is an optional procedure to the
____
bootstrap installation procedure, which is recommended.
A. Equipment
(1)
PT90-E - Universal Engine Change System,
Dendro-Maskin Lift AB, Lovholmsgrand
12, S-117 43 Stockholm, Sweden, or
NORDEQUIP, INC., 7315 Courthouse
Boulevard, Hastings, MN 55033
(2)
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 动力装置 POWER PLANT 2(14)
