Date: March 18, 1939
Time: 1317
Location: Near Adler, Washington
Operator: Boeing Aircraft Company
Flight #: ?
Route: Test flight
AC Type: Boeing 307 Stratoliner
Registration: NX19901
cn / ln: 1994
Aboard: 10   (passengers:8  crew:2)
Fatalities: 10   (passengers:8  crew:2)
Ground: 0
Summary: The aircraft crashed after the tail broke off. Dutch engineer A.G. von Baumhauer among those killed. He was a famous helicopter pioneer who first came up with the tail rotor/main rotor configuration which is in use today. Strructural failure of the wings and horizontal tail surfaces due t o the imposition of loads thereon in excess of those for which they were designed, the failure occurring in an abrupt pull-out from a dive following recovery from an inadvertent spin.

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