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Accident description
Last updated: 25 June 2016
Status:Final
Date:Monday 19 October 1959
Time:16:20
Type:Boeing 707-227
Operator:Boeing
Registration: N7071
C/n / msn: 17691/45
First flight: 1959
Total airframe hrs:173
Engines: 4 Pratt & Whitney JT4A-3
Crew:Fatalities: 4 / Occupants: 8
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 4 / Occupants: 8
Airplane damage: Damaged beyond repair
Location:16 km (10 mls) NE of Arlington, WA (   United States of America)
Phase: Maneuvering (MNV)
Nature:Training
Departure airport:Seattle-Boeing Field International Airport, WA (BFI/KBFI), United States of America
Destination airport:Seattle-Boeing Field International Airport, WA (BFI/KBFI), United States of America
Narrative:
The Boeing 707 N7071 was operating on a customer guarantee and acceptance training flight prior to delivery of the plane to Braniff. The plane was being flown by a Braniff captain and a Boeing testpilot as instructor. Other Braniff and Boeing personnel were on board as crew members and observers. A series of Dutch Rolls were performed; one of the rolls was executed beyond the maximum bank restrictions. Control was lost, but the aircraft recovered. During the recovery however, the no. 1, 2 and 4 engines were torn off. An intense fire burned away portions of the jet control near the no. 2 engine attachment area. An emergency descent was carried out and the plane crash-landed along river.

PROBABLE CAUSE: "The structural failure induced during an improper recovery attempt from a Dutch Roll which exceeded the angle-of-bank limits prescribed by the company."

Classification:
Engine separation
Loss of control

Sources:
» ICAO Accident Digest, Circular 62-AN/57 (190-194)


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