NTSB-AAR-72-18 TECHNICAL REPORT STANDARD Title PAGE
SA-424 FILE NO. 1-0002 AIRCRAFT ACCIDENT REPORT WESTERN AIR LINES, INC. BOEING 720-047B,N3166 ONTARIO INTERNATIONAL AIRPORT ONTARIO, CALIFORNIA MARCH 31, 1971 ADOPTED: JUNE 7, 1972 NATIONAL TRANSPORTATION SAFETY BOARD Washington, 0. C. 20591 REPORT NUMBER: NTSB-AAR-72-18 TECHNICAL REPORT STANDARD TiTLE PAGE . Report No. 2.Government Accession No. 3.Recipient's Catalog No. NTSB-AAR-72-18 I. Title and Subtitle 5.Report Date Aircraft Accident Report - Western Air Lines, InC., Sune 7, 1972 Roeing 720-047B, N3166, Ontario International Airport, 6.Performing Organization Ontario. California, March 31, 1971 Code '. Author(s) 8.Performing Organization Report No. I. Performing Organization Name and Address IO.Work Unit No. Bureau of Aviation Safety 11 .Contract or Grant No. National Transportation Safety Board Washington, D. C. 20591 13.Type of Report and Period Covered 12.Sponsoring Agency Name and Address Aircraft Accident Report March 31, 1971 NATIONAL TRANSPORTATION SAFETY BOARD Washington, 0. C. 20591 14.Sponsoring Agency Code 15.Supplementary Notes I6.Abstract Flight 366, a Boeing 720B, on a proficiency check flight, yawed and rolled out of control, and crashed while in the process of executing a 3-engine missed- approach from a simulated engine-out ILS instrument approach. The five crew- members and only occupants died in the crash. The weather conditions at Ontario were 600 feet overcast, with 3/4-mile visibility in fog, haze, and smoke. The National Transportation Safety Board determines that the probable cause of this accident was the failure of the aircraft rudder hydraulic actuator support fitting. The failure of the fitting resulted in the inapparent loss Of left rudder control which, under the conditions of this flight, precluded the pilotk ability to maintain directional control during a simlated engine-out missed- approach.
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