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Last updated: 16 September 2019
Status:Schlussbericht
Datum:Montag 19 Oktober 1959
Zeit:16:20
Flugzeugtyp:Boeing 707-227
Fluggesellschaft:Boeing
Kennzeichen: N7071
Werknummer: 17691/45
Baujahr: 1959
Betriebsstunden:173
Triebwerk: 4 Pratt & Whitney JT4A-3
Besatzung:Todesopfer: 4 / Insassen: 8
Fluggäste:Todesopfer: 0 / Insassen: 0
Gesamt:Todesopfer: 4 / Insassen: 8
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:16 km (10 Meilen) NE of Arlington, WA (   USA)
Flugphase: Manövrieren (MNV)
Betriebsart:Ausbildungsflug
Flug von:Seattle-Boeing Field International Airport, WA (BFI/KBFI), USA
Flug nach:Seattle-Boeing Field International Airport, WA (BFI/KBFI), USA
Unfallbericht:
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:

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."

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


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This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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