FAA Approves DuganAir Modification For Stage 3 727s
DuganAir, Bellevue, Wash., received an FAA supplemental type certificate for its Quiet Wing System for all gross weights of the Boeing 727. The company said that "in addition to meeting Stage 3 requirements without hushkitting or re-engining, Quiet Wing System provides operators of 727s up to 210...
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