757 AMM 飞机维护手册 起落架 CHAPTER 32 - LANDING GEAR 1(75)

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 B.  Each gear is installed on the wing between the rear wing spar and the main landing gear beam.
 C.  Each gear includes a shock strut, drag strut, side strut and downlock assembly, trunnion link, reaction link, torsion links, and truck assembly.
 2.  Component Details_________________
 A.  Trunnion Link (Fig. 1)
_____________
 (1)  
The trunnion link is installed between the shock strut and the rear wing spar. Loads from the drag strut are transmitted through the trunnion link to airplane structure. The forward end of the link mounts in a spherical bearing on the rear wing spar. Under severe impact, the pin connection at the bearing will fail, and allow the gear to break away from airplane structure with minimal damage. Attachment for the drag strut and strut door are located on the trunnion link.

 B.  
Shock Strut (Fig. 1)

___________
 (1)  
The shock strut is the primary supporting member of the main gear. The strut consists of inner and outer cylinders which are charged with an air-oil mixture to absorb loads during landing, taxiing, and take-off. The shock strut mounts into a spherical bearing on the main landing gear beam and attaches to the trunnion link.

 (2)  
Upper and lower bearings inside the outer cylinder provide sliding surfaces between the two cylinders. Two active seals, one static and one dynamic, seal the air-oil mixture between the two cylinders. Two sets of spare seals are stored in annular grooves in the lower bearing.

 (3)  
Shocks are absorbed by the flow of hydraulic fluid through the annular space between a metering pin and an orifice plate. The metering pin is tapered to progressively adjust the flow of hydraulic fluid. This provides uniform control of the loads on airplane structure. A rebound snubber, located just below the upper bearing, acts as a one-way restrictor. During compression, the snubber allows free flow of hydraulic fluid. During extension, the snubber restricts flow of hydraulic fluid and thus controls rebound of the shock strut.

 

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A

757
MAINTENANCE MANUAL

SEE  A B 
LOWER DOWNLOCK LINK  UPPER DOWNLOCK LINK  LINK TRUNNION 
UPPER SIDE STRUT  DOWNLOCK SPRINGS FUSE PIN 
DRAG STRUT 
LOWER SIDE STRUT 
TORSIONAL FUSE SECTION  STRUT DOOR 
SHOCK STRUT  SEE  C 

FWD
A
Main Gear Figure 1 (Sheet 1)

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A

757 MAINTENANCE MANUAL
MAIN LANDING
REACTION GEAR BEAM (REF)
LINK
AFT
SIDE STRUT TRUNNION
SUPPORT LINK BEARING FUSE PIN
REAR WING SPAR (REF) FUSE PIN (LOCATED AT MLG BEAM OUTBD
FORWARD
ATTACHMENT)

TRUNNIONFUSE PINS BEARING
(4 PLACES)  FUSE PIN
FUSE PIN
B
UPPER TORSION LINK
BEAM TRUCK  BRAKE ROD  LINK LOWER TORSION 
C 
Main Gear Figure 1 (Sheet 2)

 

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A

757
MAINTENANCE MANUAL

 (4)  
The outer cylinder provides attachments for the drag strut, lower side strut, and upper torsion link. Also attached to the outer cylinder is an uplock roller which engages in the uplock hook during gear retraction to lock the gear up. The inner cylinder provides attachments for the truck assembly and lower torsion link.

 C.
Torsion Links (Fig. 1)

_____________
 (1)  
The torsion links prevent the shock strut inner cylinder from rotating as it moves in and out of the outer cylinder during normal operation. This maintains truck directional headings at all times.
　
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