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ASN Wikibase Occurrence # 27137
Last updated: 21 March 2019
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Time:c. 08:20
Type:Silhouette image of generic TRMA model; specific model in this crash may look slightly different
Stinson Model A
Owner/operator:Australian National Airways (ANA)
Registration: VH-UYY
C/n / msn: 9130
Fatalities:Fatalities: 10 / Occupants: 10
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Spring Plains, VIC -   Australia
Phase: En route
Nature:Domestic Scheduled Passenger
Departure airport:Melbourne-Essendon Airport, VIC (MEB/YMEN)
Destination airport:Kerang Airport, VIC (KRA/YKER)
The Stinson Model A, named "Tokana", crashed following an in-flight break-up 2 miles east of Redesdale, Australia. Pilot Capt Alan Murn, co-pilot 1st Off Orville Openshaw and eight passengers died.

The aircraft was converted in 1943 to twin-engine configuration by removing the three Lycoming engines and installing a 550 hp 9-cylinder Pratt & Whitney R-1340-AN1 Wasp engine on each wing. The aircraft as subsequently used by Australian National Airways on the Melbourne-Kerang-Mildura-Broken Hill route.

Examinations determined that separation of the left wing was initiated by metal fatigue of the lower main spar boom attachment socket. The primary structure of the Stinson was of welded steel tube construction. A fatigue crack had initiated in weld metal on the inner surface of the socket. After propagating through the weld metal during a large number of flights, the fatigue crack entered the socket's parent metal. This crack eventually affected 45% of the cross-section of the socket before the lower boom failed on the fatal flight. Investigators noted the amount of metal in the socket that was unaffected by the fatigue crack at the time of the accident and calculated that the wing was capable of supporting loads up to about 2.5 times the weight of the aircraft on its fatal flight. This suggested the gusting winds prevailing at the time, and the turbulence associated with the low altitude at which the aircraft was flying, were partly responsible for the failure.

As a result of the accident, the Department of Civil Aviation began a practice of calculating the safe retirement life of metal aircraft registered in Australia.
The Structures and Materials Division of the Division of Aeronautics laboratory began a long-term program aimed at advancing the knowledge of metal fatigue in aircraft structures. Some 200 surplus wings of P-51 Mustang were tested by repeated loading to examine the characteristics of fatigue in aircraft structures.


Air Crash Vol.2/Mcartur Job

Revision history:

27-Sep-2008 01:00 ASN archive Added
22-Aug-2010 14:36 TB Updated [Time, Cn, Operator, Other fatalities, Location, Phase, Nature, Departure airport, Destination airport, Source, Narrative]
23-Feb-2011 04:21 harro Updated [Departure airport]
27-Jan-2018 13:06 harro Updated [Departure airport, Destination airport, Source, Narrative]
27-Jan-2018 13:13 harro Updated [Narrative]

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