747-400 AMM 飞机维护手册 机身 FUSELAGE(37)

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 A.  The upper side strut is the only wing main gear attachment to the fuselage. For attachment of the trunnion and actuator support link to the wing spar and the landing gear beam (Ref 57-43-00).
 B.  The upper side strut provides lateral, vertical, fore, and aft support for the shock strut and is attached to the support fitting immediately forward of the body station 1350 bulkhead. Attachment of the side strut to this fitting is with a high heat-treated, steel spindle.
Body Main Landing Gear Attach Fittings (Fig. 3)
______________________________________
 A.  There are five attach points to the fuselage from each of the two body main landing gears: the drag strut, jury strut, retraction actuator, and inboard and outboard trunnion attachments.
 B.  A high heat-treated, steel spindle attaches the drag strut to the fuselage drag strut fitting which is made of forged aluminum (Detail A, Sheet 1). The fuselage drag strut fitting is fastened to the keel beam and distributes the drag strut loads into the fuselage.
 C.  Attachment of the jury strut is by a spindle to the aft end of the fuselage drag strut fitting (Detail B, Sheet 1). The jury strut serves as a locking and stabilizing member for the drag strut.
 D.  The retraction actuator is attached to an aluminum forged fitting on the body station 1480 bulkhead at BL 84.6 and WL 159.5 (Detail C, Sheet 2). The gear actuation loads are distributed by this fitting into the bulkhead. The upper end of the fitting is at WL 186.2.
 E.  The inboard trunnion support fitting is attached to the keel beam by links at its lower inboard end and to the body station 1480 bulkhead (Detail D, Sheet 2). The combined inboard and outboard trunnions provide the hinge for body gear retraction.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
DRAG STRUT SUPPORT BEAM
STA 340
NOSE GEAR TRUNNION SUPPORT FITTING
SEE B
DOOR SEQUENCING 
ROD (REF)  FWD 
SEE  A 
NOSE GEAR 
ACTUATOR 

TRUNNION  NOSE GEAR WHEEL WELL TOP (REF) UPPER DRAG STRUT SUPPORT FITTING 
SUPPORT TRUNNION  FWD  ATTACH ROD 
A 
FWD  ACTUATOR SUPPORT FITTING 
UPPER DRAG STRUT  B  STATION 340 BULKHEAD 
Nose Gear Attachment Figure 1 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
SEE A
WING GEAR SHOCK STRUT
FWD
BATH TUB FITTING 
LANDING GEAR STRUT SUPPORT FITTING  SPINDLE 
FWD 
Wing Gear Attachment Figure 2 UPPER SIDE STRUT A  STATION 1350 BULKHEAD 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

SEE  B  SEE  D  SEE  C 
SEE  E 
SEE  A 
FWD  KEEL BEAM  SPINDLE 
ATTACH FITTING 
ATTACH FITTING SPINDLE  A  DRAG STRUT 
JURY STRUT  FWD 
B  BODY GEAR SHOCK STRUT DOOR (REF) 
Body Gear Attachments Figure 3 (Sheet 1) 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

Body Gear Attachments
　
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