Diamond Aircraft DV 20 E 2022, Airplane Maintenance Manual

Page: 501 / 903

AIRCRAFT
DV 20 E AMM
Landing Gear
Doc # 4.02.25
Rev. 2
32-10-00
Page 1
15 Mar 2022
Section 32-10
Main Landing Gear
1. General
This chapter describes the data for the main landing gear. It gives you the trouble-shooting and
maintenance practices. Refer to Chapter 32-40 for data for the main wheels and the brakes.
2. Description and Operation
Each main gear strut is an aluminum alloy leaf spring. Two strong mounts attach each spring to the
spar bridge in the fuselage. Small panels with flexible centers seal the gap where each strut goes
through the fuselage shell.
The inner mount is a large vertical bolt. The bolt goes through a metal block which attaches to a
U-shaped bracket. The bracket goes under and around the spar bridge. Spring washers separate the
top face of the spring from the block. A castle-nut pre-loads the spring washers.
The outer mount is an H-shaped bracket. The top arms of the H go fore and aft of the spar bridge. The
leaf spring goes between the bottom arms of the H. A retaining bar holds the leaf spring in position.
UHMW - polyethylene inserts go above and below the leaf spring to prevent chafing damage. Brass
strips go each side of the leaf spring.
Four bolts at the outer end of each strut attach the following components:
)
An aluminum axle.
)
A brake torque-plate.
)
A mount for the GFRP wheel fairing (optional).
When the airplane is on the ground, the inner end of the leaf spring pulls down on the inner mounting.
The outer end pushes up against the outer mounting. When the airplane is flying, the inner end of the
leaf spring pushes up on the inner mounting. And the outer end pulls down against the retaining bar
of the outer mounting.