FLIGHT EVALUATION OF REDESIGNED EXTERNAL CARGO SWING FOR H-21 HELICOPTER Open PDF Document Details Document Type Technical Report Publication Date Jan 01, 1961 Accession Number AD0258086 Entities Organizations Boeing Rotorcraft Systems Tags Communities of Interest Advanced Electronics Air Platforms Weapons Technologies DTIC Thesaurus Topics Aircrafts Airplanes Cargo Handling Contracts Couplings Fittings Fuselages Government Procurement Governments Helicopters Hydraulic Cylinders Joints Marine Corps New York Test And Evaluation Transportation United States