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The forward lower engine mount provides suspension of the engine at three points; a bearing shear fitting and two thrust links. The bearing shear fitting is inserted into a mating hole in the intermediate case rear flange and retained by four bolts. The two thrust links are attached to the intermediate case rear flange on either side of the bearing shear fitting and to the aft end of the mount assembly. The forward lower engine mount attaches to the forward upper engine mount with four vertical tension bolts. Refer to 71-21-00 for additional forward lower engine mount description.

 (2)  
The aft lower engine mount provides suspension of the engine at three points on the turbine exhaust case double flange. The mount consists of two tangential links and a center link which attaches to a common mount fitting. The fitting attaches to the strut with four vertical bolts. Refer to 71-21-00 for additional aft lower engine mount description.

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 ALL  ú ú 02 Page 1 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

FORWARD UPPER 
BEARING  ENGINE MOUNT 
SHEAR  SEE  B 
FITTING 
ENGINE 
CASE  SEE  A 
FLANGE 

FWD
FORWARD LOWER ENGINE MOUNT
THRUST LINK (2 PLACES)
FORWARD LOWER ENGINE MOUNT
A
AFT LOWER ENGINE MOUNT
FWD
AFT LOWER ENGINE MOUNT B
Forward and Aft Engine Mounts Figure 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 NACELLE STRUT SPRING BEAM SUPPORT FITTING - REMOVAL/INSTALLATION
________________________________________________________________
 1.  General
_______
 A.  This procedure contains two tasks. The first task is to remove the spring beam support fitting. The second task is to install the spring beam support fitting.
 B.  It is necessary to remove the spring beam support fitting to repair the front end journal (spherical) bearing. To remove the spring beam support fitting, it is first necessary to remove the spring beam.
 TASK 54-51-06-004-001-001
 2.  Remove the Spring Beam Support Fitting (Fig. 401)
______________________________________
 A.  References
 (1)  AMM 54-51-03/401, Spring Beam
 B.  Procedure
 S 014-002-001
 (1)  
Remove the spring beam (1) (AMM 54-51-03/401).

 S 024-003-001

 (2)  
Remove the spring beam support fitting (2).

 (a)  
Remove the fasteners that attach the four radius fillers (3), and remove the radius fillers.

 (b)  
Remove the fasteners that attach the five radius fillers (4), and remove the radius fillers.

 (c)  
Remove the fasteners that attach the three radius fillers (5), and remove the radius fillers.

 (d)  
Remove the remaining four fasteners.

 

 NOTE: It is not necessary to remove the three fasteners
____ that attach the bearing retainer to the spring beam support fitting.
 (e)  Remove the spring beam support fitting (2).
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 54-51-06
 ALL  ú CONFIG 1 ú 01 Page 401 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE A
SPRING BEAM
A
A
SPRING BEAM
OUTBOARD NACELLE STRUT (NO. 1 STRUT IS SHOWN, NO. 4 STRUT IS OPPOSITE)
A
BEAM MOUNT
BULKHEAD
SPLICE CHORD
(REF)
(REF)
SPRING BEAM FITTING (REF)SPHERICAL BEARING (REF)
1. SPRING BEAM
2. SPRING BEAM
BEAM
SUPPORT FITTING
　
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