Accident Rockwell S-2R Thrush Commander N5686X, 31 May 2004
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ASN Wikibase Occurrence # 177918
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Type:Silhouette image of generic SS2P model; specific model in this crash may look slightly different    
Rockwell S-2R Thrush Commander
Registration: N5686X
MSN: 2359R
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Beaver, UT -   United States of America
Phase: Landing
Departure airport:Beaver, UT (U52)
Destination airport:Beaver, UT (U52)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
According to the pilot, he had finished spraying a field and was returning to the airport for another load. He said that he had half a tank of fuel remaining and the engine was producing "excellent power." A few moments later, the engine ran rough for about a second and then stopped. He did not notice anything coming out of the exhaust. The pilot tried twice to restart the engine but was unsuccessful and he attempted a forced landing to an open field. During the landing, the airplane impacted terrain and struck a fence. Both wings were displaced aft and the right main landing gear was collapsed. A visual examination of the engine revealed a 360 degree crack around the P3 air pressure tube, causing a separation of the tube between the engine plenum and fuel control unit. The crack was approximately one-quarter inch aft of the "B" nut, which connects the P3 air pressure tube to the fuel control unit. There was a "notable" amount of carbon build-up in the area around the crack. According to a maintenance representative, failure of the tube in flight would have resulted in a "significant reduction in fuel scheduling which could result in an engine flameout." An attempt to restart the engine in flight would "likely have failed," however; an attempt would have accounted for the "notable" amount of carbon build-up around the break in the tube. No other aircraft anomalies were noted.

Probable Cause: the in-flight failure of the engine's P3 tube which resulted in the loss of engine power and the subsequent impact with terrain during a forced landing. Contributing factors include the lack of suitable terrain for a forced landing and the fence.



Revision history:

18-Jul-2015 16:31 Noro Added
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
07-Dec-2017 17:58 ASN Update Bot Updated [Cn, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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