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ASN Wikibase Occurrence # 45055
Last updated: 21 December 2019
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Type:Silhouette image of generic C177 model; specific model in this crash may look slightly different
Cessna 177B
Registration: N30921
C/n / msn: 17701546
Fatalities:Fatalities: 2 / Occupants: 3
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Chinook, MT -   United States of America
Phase: En route
Departure airport:Great Falls, MT (GTF)
Destination airport:Poplar, MT (42S)
Investigating agency: NTSB
While in cruise flight the aircraft suddenly lost all engine power, and after unsuccessfully attempting to get the engine restarted, the pilot attempted a forced landing on a nearby gravel road. During that attempt, the pilot failed to adequately compensate for strong crosswinds, and therefore inadvertently clipped the top of a tree that was located immediately adjacent to the approach end of the section of road he was trying to land upon. A post-accident inspection of the engine determined that the carburetor had separated from the engine in cruise flight, due to the fact that there were no longer any nuts on any of the four carburetor mount retaining lug bolts. The carburetor mounting flange holes all remained intact, and none of the four mounting bolts showed any signs of damaged or distorted threads. Recent use of Marihuana was determined to have impaired the pilot's judgment at the time he was attempting the forced landing.
Probable Cause: The total loss of engine power in cruise flight due to the separation of the carburetor from its mounting bolts, and the pilot's failure to adequately compensate for strong crosswinds while attempting the subsequent forced landing. Additional factors include strong crosswinds, a tree immediately adjacent to the gravel road that the pilot chose to land on, and the pilot's impairment due to recent use of Marihuana.



Revision history:

28-Oct-2008 00:45 ASN archive Added
21-Dec-2016 19:24 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
08-Dec-2017 19:59 ASN Update Bot Updated [Operator, Source, Narrative]

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