(c)  
Make sure the dual barrel nuts in the rear of the top engine mounts are free from damage.

 (d)  
Replace all the damaged barrel nuts.

 (e)  
Make sure the part of the forward mount brackets that you can see are solid and are in good condition.

 (f)  
Look for damage at the areas where the forward mount brackets attach (Fig. 602).

 S 426-006-N00
 (4)  Install the power plant (AMM 71-00-02/401).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-21-00
 ALL  ú ú N01 Page 608 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE A
PUCK
MOUNT BRACKETS
FWD
INTERMEDIATE CASE
A L-A0701
Front Mount BracketsFigure 602
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-21-00
 ALL  ú ú N01 Page 609 ú Apr 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FORWARD LOWER ENGINE MOUNT - REMOVAL/INSTALLATION
_________________________________________________
 1.  General
_______
 A.  This procedure gives the instruction for the removal and installation of the forward lower engine mount.
 B.  The engine mount is attached to the engine case flange by a bearing housing and two thrust links.
 C.  You can get an access to the engine mount after you remove the engine.
 TASK 71-21-01-004-001-N00
 2.  Remove the Forward Lower Engine Mount (Fig. 401)
_____________________________________
 A.  References
 (1)  
AMM 71-00-02/401, Power Plant

 (2)  
IPC 71-21-01 Fig. 1

 B.  
Access

 (1)  
Location Zone
 412 Engine 1
 422 Engine 2
 432 Engine 3
 442 Engine 4

 C.  
Procedure

 S 014-002-N00
 (1)  
Remove the power plant (AMM 71-00-02/401).

 S 034-003-N00

 (2)  
Remove bolts (7), washers (5 and 6), and nuts (4) from the thrust link and the engine case flange.

 S 034-004-N00

 (3)  
Remove the bolts (2) and washers (1) from the bearing housing and the engine case flange.

 (4)  
Remove the engine mount (3) from the engine.

 S 024-010-N00
 TASK 71-21-01-404-005-N00
 3.  Install the Forward Lower Engine Mount (Fig. 401)
______________________________________
 A.  Consumable Materials
 (1)  A00779 Sealant - BMS 5-26 Type II
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-21-01
 ALL  ú ú N01 Page 401 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  A
BEARING 
HOUSING 
SEE  B
1. WASHER
 (4 LOCATIONS) 
ENGINE CASE
FLANGE  2. BOLT 
(4 LOCATIONS) 
7. BOLT
 (2 LOCATIONS)  3. FORWARD LOWER
 ENGINE MOUNT

6. WASHER THRUST LINK 
(2 LOCATIONS)  (2 LOCATIONS) 
4. NUT 
(2 LOCATIONS) 
(2 LOCATIONS) 5. WASHER  PIN 8. COTTER  FWD 
A

Forward Lower Engine Mount Installation
Figure 401 (Sheet 1)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 71-21-01
 ALL  ú ú N01 Page 402 ú Oct 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
BEARING
HOUSING

BEARING HOUSING
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 動力裝置 POWER PLANT 2(96)