Both nose and main gear have single wheels with low pressure tires. Each main gear strut has a disk brake. Toe-brake pedals on the rudder pedals operate the disk brakes. A parking brake valve allows the brakes to be set ON for parking.
The landing gear absorbs vertical loads (for example, landing loads). Each main gear strut is a leaf-spring which deflects upwards as the load increases. The elastomer pack in the nose gear compresses as the load increases. In each case, the spring returns to the original position when the load is removed.
Push on both toe-brake pedals at the same time to apply both disk brakes. The airplane will stop in a straight line.
Push on one toe-brake pedal to apply the disk brake on that side only. The airplane will steer to that side.
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Move the parking brake lever fully up. Then push on both toe-brake pedals a few times to apply the parking brake. Move the parking brake lever fully down to release the parking brake.
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Section 32-10
Main Landing Gear
1. General
This section gives you the data for the main landing gear. It gives you the trouble-shooting and maintenance practices. Refer to Section 32-40 for data for the main wheels and the brakes.
2. Description and Operation
Figure 1 shows the main gear strut mounting. Each main gear strut is a steel alloy leaf spring. Two strong mounts attach each spring to the center section of the fuselage. Small panels with flexible centers seal the gaps 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 the center closing rib of the fuselage center section. Spring washers separate the top face of the spring from the block. A convex and a concave washer separate the bottom face of the spring from a castle nut. The castle-nut pre-loads the spring washers.
The outer mount has 2 parts. The upper part locates on top of the main strut and the lower retaining bar locates below the main strut. Two bolts attach the assembly to the main landing gear rib. The main landing gear rib is bonded into the fuselage center section. Reinforced synthetic rubber inserts go between the leaf spring and the retaining bar to prevent chafing damage and allow angular movement of the leaf spring in the mount.
Figure 2 shows the main landing gear axle installation. Six bolts at the outer end of each strut attach these components:
%) An axle, made from steel or aluminum (refer to M.M 40-083)
) A brake torque-plate.
) A mounting plate for the GFRP wheel fairing.
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.
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AIRCRAFT
B B A
A Bolt
Plain Washer
Inner Bolt
Nut Washer Web
Mounting Block Polyamide Insert
Retaining Bolt
Spring Washers
Convex Washer
Flexible Insert Concave Washer
Retaining Bar
Castle Nut
Cotter Pin
Washer Nut
Figure 1: Main Landing Gear Strut Mounting
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Trouble-Shooting
1. General
Use the data below to trouble-shoot the main landing gear.
WARNING: YOU MUST DO A HARD LANDING CHECK AFTER A HARD LANDING. HARD LANDING CAN CAUSE DAMAGE TO THE STRUCTURE AS WELL AS THE LANDING GEAR.
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本文链接地址：钻石40飞机维护手册 DA 40 SERIES AMM 3(75)
