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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A SEE B TORQUE WRENCH
SOCKET ADAPTER
(2 LOCATIONS) TENSION BOLT 1. FORWARD VERTICAL (2 LOCATIONS) TENSION BOLT 2. FORWARD VERTICAL
(4 LOCATIONS) WASHER 3. COUNTERSUNK
SHEAR PIN 4. FORWARD MOUNT
FWD
5. BARREL NUT (4 LOCATIONS)
6. RETAINER
(4 LOCATIONS)
A
Forward and Aft Engine Mount Installation Figure 411 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
8. WASHER (2 LOCATIONS)
9. NUT (4 LOCATIONS)
(2 LOCATIONS) 13. RETAINER (2 LOCATIONS) 7. BOLT (2 LOCATIONS) AFT LOWER ENGINE MOUNT 10. RETAINER
AFT UPPER ENGINE MOUNT
SHEAR PIN (2 LOCATIONS)
11.
WASHER (4 LOCATIONS)
12.
AFT VERTICAL TENSION BOLT (4 LOCATIONS)
FWD
B
Forward and Aft Engine Mount Installation
Figure 411 (Sheet 2)
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71-00-02
ALL ú ú N02 Page 443 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
2) If there is clearance between the engine mounts and the strut, slowly add the force on the forward or aft hoists to remove the clearance.
(c) Loosen the forward and aft vertical tension bolts (1, 2,
and 12) another one-half turn.
NOTE:____The load cell indications must not change. Make sure there is a distance between the engine mounts and the strut.
1) If the load cell indications increase, make sure the indications are less than the maximum permitted value.
2) If there is clearance between the engine mounts and the strut, slowly add the force on the forward or aft hoists to remove the clearance.
(d) Remove the vertical tension bolts (1, 2, and 12) and washers (3 and 11). 1) The engine must be held by the hoists. 2) Make sure there is no gap between the engine mounts and the
strut.
S 024-045-N00
(10) Lower the power plant and attach it to the transportation stand with the steps that follow:
WARNING:_______KEEP THE WORK STANDS AND PERSONS AWAY FROM THE STRUT. THE POWER PLANT CAN MOVE WITH RELATION TO THE STRUT WHEN THE SHEAR PINS ARE AWAY FROM THE STRUT. IF THE PERSONS AND WORK STANDS ARE NOT AWAY FROM THE STRUT, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(a)
Slowly and equally lower the forward 6-ton hoists until the
forward shear pins is away from the strut.
(b)
Slowly and equally lower the aft 3-ton hoists until the aft
shear pins are away from the strut.
(c)
Lower the engine with the hoists, approximately 6 to 8 inches before the rotation level, to put together with the transportation stand. 1) The clearance at the forward and aft engine mount must
increase at the same rate.
(d)
Align the cradle and the transportation stand.
(e)
Lower and attach the cradle to the transportation stand with
the steps that follow (Fig. 410):
1) Align the clamps (3).
2) Tighten the bolts (2).
3) Install the pins (4).
(f)
Disconnect the hoists (2 and 11) from the cradle and the
bootstrap equipment (Fig. 409).
(g)
Pull the transportation stand, with the cradle and the power
plant attached, forward until it is away from the strut.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú 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 1(126)
