Beschrijving: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.
|Datum:||maandag 19 oktober 1959|
|Motoren:|| 4 Pratt & Whitney JT4A-3|
|Bemanning:||slachtoffers: 4 / inzittenden: 8|
|Passagiers:||slachtoffers: 0 / inzittenden: 0|
|Totaal:||slachtoffers: 4 / inzittenden: 8 |
|Gevolgen:|| Written off (damaged beyond repair)|
|Plaats:||16 km (10 mijl) NE of Arlington, WA ( Verenigde Staten)
|Fase:|| Manoeuvreren (MNV)|
|Vliegveld van vertrek:||Seattle-Boeing Field International Airport, WA (BFI/KBFI), Verenigde Staten|
|Vliegveld van aankomst:||Seattle-Boeing Field International Airport, WA (BFI/KBFI), Verenigde Staten|
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."
» ICAO Accident Digest, Circular 62-AN/57 (190-194)
This information is not presented as the Flight Safety Foundation or the Aviation Safety Networkĺs opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.