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Additional resources for Aircraft Landing Gear Design: Principles and Practices (AIAA Education Series)

Sample text

After the low-rate retraction tests have been completed with doors operable, the tests are repeated at full power to verify that dynamic effects do not impair the correct functioning of the gears. Proof loading tests are often conducted before first flight, with simulated air loads applied to the gears and doors; with these loads applied, the gear is again cycled. Apart from checking the ability to operate properly under load, the gapping of doors is examined. Aerodynamic suction forces tend to pull the doors outward and, if this is severe enough, the air forces penetrate the inside surfaces of the doors and blow them off the aircraftmhence, the need to check gapping.

75 times the piston diameter, with the strut fully extended, and bearing stresses shall not exceed 6000 psi based on the limit load and uniform distribution. 25 times the piston diameter (USAF/USN). At the threads for the wheel bearing retainer nut, there shall be two cotter pin holes at 90 deg spacing. Use steel retaining nuts (USAF/USN). Provide adequate rebound snubbing as indicated in MIL-T-6053 and MIL-A-8629 (USAF/USN). Static inflation pressure shall not exceed 2500 psi and the gear shall be capable of satisfactory operation at all temperatures between - 6 5 and + 160°F and under all applicable load conditions (USAF/USN).

2) Integration of the kinetic energy added to the aircraft by the thrust of the aircraft's propulsion system during the stop. 3) Integration of the kinetic energy absorbed by the aircraft's aerodynamic drag, including propeller drag (if applicable) during stopping. 4) Integration of the kinetic energy absorbed by any auxiliary deceleration devices (such as reverse thrust or drag chute) during the stop. 5) Integration of the kinetic energy to be absorbed by the wheel brakes during the stop. 6) Effect of wing lift in reducing wheel load, thereby reducing brake torque capability.

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