title: Why are helicopters so expensive? Part 3.
authors.affiliation: Sikorsky Aircraft Corp. in Stratford, Conn, USA.
authors.forename: Vaughan
authors.initials: V
authors.lastname: Askue
mesh_terms: D000068:Accreditation; D017732:Air Ambulances / Q000191:economics*; D001359:Aviation / Q000295:instrumentation*; D002201:Capital Expenditures; D004869:Equipment Safety; D017408:Guidelines as Topic; D008283:Maintenance / Q000191:economics; D017751:Safety Management / Q000191:economics; D014481:United States