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ASN Wikibase Occurrence # 191804
Last updated: 23 March 2021
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Date:01-DEC-2016
Time:16:29
Type:Silhouette image of generic C340 model; specific model in this crash may look slightly different
Cessna 340
Owner/operator:Private
Registration: N123KK
C/n / msn: 340-0251
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Wild Rice area, Cass County, south of Fargo, ND -   United States of America
Phase: Approach
Nature:Unknown
Departure airport:Fargo, ND (KFAR)
Destination airport:Fargo, ND (KFAR)
Investigating agency: NTSB
Narrative:
The airplane was equipped with an air sampling system used to collect air samples at various altitudes. The accident occurred when the pilot was returning to the airport after taking air samples at various altitudes over oil fields. As he was being vectored for an instrument approach, the airplane overshot the runway's extended centerline. The pilot then reported that he had a fire on board. The airplane lost altitude rapidly, and radar contact was lost. Examination of the accident site indicated that the airplane struck the ground at high velocity and a low impact angle.

One piece of the airplane's shattered Plexiglas windshield exhibited soot streaking on its exterior surface. This soot streaking did not extend onto the piece's fracture surface, indicative of the smoke source being upstream of the windshield and the smoke exposure occurring before windshield breakup at impact.

Both nose baggage compartment doors were found about 2 miles south of the main wreckage, which indicative that they came off at nearly the same time and most likely before the pilot's distress call. Although there was no soot deposits, thermal damage, or deformation to the doors consistent with a "high energy explosion," the separation of the luggage compartment doors could have occurred due to an overpressure caused by the ignition of a fuel air mixture within the nose portion of the airplane. The ignition of fuel air mixtures can create overpressure events when they occur in confinement. An overpressure in the nose baggage compartment may have stretched the airframe enough to allow the doors to push open without deforming the latches. If it was a lean fuel air mixture, it would likely leave no soot residue.

Post-accident examination revealed no evidence that the air sampling system, which was strapped to the seat tracks behind the copilot's seat, was the cause of the fire. The combustion heater, which was mounted in the right front section of the nose baggage compartment, bore no evidence of fuel leakage, but a fuel fitting was found loose.

Probable Cause: The loose fuel fitting on the combustion heater that leaked a lean fuel-air mixture into the nose baggage compartment. The mixture was most likely ignited by the combustion heater, blowing off the nose baggage compartment doors and starting an in-flight fire.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20161201X92343&key=1

https://flightaware.com/live/flight/N123KK/history/20161201/2020Z/KFAR/KFAR

FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=123KK

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 2 months
Download report: Final report
Location


Images:

Photo of N123KK courtesy AirHistory.net


Red Deer - Regional (CYQF / YQF)
1 June 2010; (c) John Olafson

Revision history:

Date/timeContributorUpdates
02-Dec-2016 01:54 Geno Added
02-Dec-2016 02:09 Geno Updated [Aircraft type, Registration, Cn, Operator, Phase, Destination airport, Source, Narrative]
05-Dec-2016 08:52 Anon. Updated [Damage]
19-Feb-2018 07:47 ASN Update Bot Updated [Time, Operator, Nature, Departure airport, Destination airport, Source, Narrative]

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