This rotation then allows the assembly to pull down a wedge that is used to hold the landing gear strut in place, thus returning the landing gear to its previous height before extension. One proposed actuator for this purpose was designed at Johnson Space Center and uses resistive heating to rotate the ribbon around a cylinder. Initial proof-of-concept design of the ENLG did not include the ability to retract the gear automatically. (Technical Monitor)Īs part of a project to encourage the use of shape memory alloy actuators for space actuators, this mechanism uses a nitinol ribbon to provide the necessary motion to help retract the proposed extended nose landing gear (ENLG) for the space shuttle. Retraction Assembly for Space Shuttle Extended Nose Landing Gearįiles, Bradley S. (a) General., occurring during retraction at any airspeed up to 1.6 V S 1 with flaps retracted, and for any load factor up. Design and Construction Landing Gear § 23.729 Landing gear extension and retraction system. 14 Aeronautics and Space 1 false Landing gear extension and retraction. 14 CFR 23.729 - Landing gear extension and retraction system.
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