About: Shock Cord Fabrication and Replacement   Sponge Permalink

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Main gear shock cords (bungees) are made of natural rubber encased in woven cotton. The cotton casing provides some friction between wraps and adds to the shock absorbing capability. Inferior, non-aviation cord does not stretch properly and if used, may result in bent gear and fuselage tubing. After 1993, Avid changed the cords to accommodate the increased gross weight of the Mark IV. These cords are 90" long and require 7 wraps.

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  • Shock Cord Fabrication and Replacement
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  • Main gear shock cords (bungees) are made of natural rubber encased in woven cotton. The cotton casing provides some friction between wraps and adds to the shock absorbing capability. Inferior, non-aviation cord does not stretch properly and if used, may result in bent gear and fuselage tubing. After 1993, Avid changed the cords to accommodate the increased gross weight of the Mark IV. These cords are 90" long and require 7 wraps.
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abstract
  • Main gear shock cords (bungees) are made of natural rubber encased in woven cotton. The cotton casing provides some friction between wraps and adds to the shock absorbing capability. Inferior, non-aviation cord does not stretch properly and if used, may result in bent gear and fuselage tubing. Cords are affected by time, landing cycles, UV and oxidation. Shock cords need to be replaced when they allow the main gear ends at the center of the fuselage to sag under load, or when defects are found such as frayed cotton casing, narrowed cord ("necking") or wear at contact points. Useful life is estimated at five years. For best results, both cords should be replaced at the same time. After 1993, Avid changed the cords to accommodate the increased gross weight of the Mark IV. These cords are 90" long and require 7 wraps.
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