Accident Cessna 210A Centurion N68640, Monday 2 April 2018
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Date:Monday 2 April 2018
Time::
Type:Silhouette image of generic C210 model; specific model in this crash may look slightly different    
Cessna 210A Centurion
Owner/operator:Private
Registration: N68640
MSN: 21057627
Year of manufacture:1960
Engine model:Continental IO-470-DcE
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Alma, Park County, CO -   United States of America
Phase: En route
Nature:Private
Departure airport:Erie Municipal Airport, CO (KEIK)
Destination airport:Richfield Municipal Airport, UT (KRIF)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The noncertificated private pilot departed on a cross-country flight to relocate his airplane for maintenance. When the airplane did not arrive at its intended destination, it was reported missing, and was found by hikers over 3 months later. Detailed radar data was not available, and the airplane's route of flight count not be determined. The wreckage was located in mountainous terrain at an elevation of 12,700 ft mean sea level. The damage to the airplane, the ground scars, and debris field were consistent with a right-wing low impact and subsequent cartwheel.

Surface analysis charts, wind profiles, and satellite images depicted conditions consistent with and conducive for moderate-to-severe turbulence and mountain wave along the route of flight. In addition, there were multiple pilot reports along the route of flight for moderate to severe turbulence and mountain wave. There was no record that the pilot obtained a weather briefing for the intended route of flight.

The examination of the airframe, engine, and related systems was limited due to terrain and elevation of the accident site. Impact damage precluded functional testing of the engine and related components.

With the exception of one flight the evening before the accident, during which the pilot experienced a brake problem, and after which a nose landing gear collapse when the pilot inadvertently retracted the landing gear on the ground, it is likely that the airplane had not flown for the previous 4 years and it did not have a current annual inspection.

The pilot had diabetes treated with insulin and respiratory issues resulting in a requirement for supplemental oxygen. Complications from these medical issues could impair his ability to safely operate an airplane. However, there was no evidence of overt symptoms on the day of the accident. Furthermore, based upon the pilot's history of failure to follow regulations it is more likely that the pilot's decisions on the day of the accident were consistent with his past disregard for rules rather than the effects of his medical condition.

Toxicological testing detected both ethanol and delta-9-tetrahydrocannibinol (THC), the primary psychoactive compound of marijuana. Due to the length of time that the remains were exposed to the environment, it is possible that the ethanol was from a source other than ingestion. The THC detected in the muscle indicates that the pilot had ingested marijuana at some point before to the accident. However, determination of impairment at or around the time of the flight from THC identified in tissues exposed to the elements for many months is not possible.

Given the pilot's history of failure to follow regulations, his decisions on the day of the accident are consistent with a demonstrated disregard for rules. Whether the airplane's lack of maintenance contributed to its performance in mountainous terrain could not be determined. In addition, the extent to which the pilot's lack of recent experience contributed to his ability to properly respond to a mountain wave turbulence encounter could not be determined. It is likely that this mountain wave encounter resulted in a loss of control and impact with terrain.

Probable Cause: The noncertificated pilot's poor decision to depart on a flight over mountainous terrain in an improperly maintained airplane, and the subsequent encounter with mountain wave turbulence, which resulted in the loss of airplane control and impact with terrain. Contributing to the accident was the pilot's inadequate preflight weather planning.

Accident investigation:
cover
  
Investigating agency: NTSB
Report number: CEN18FA266
Status: Investigation completed
Duration: 1 year and 7 months
Download report: Final report

Sources:

NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=68640

Location

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Revision history:

Date/timeContributorUpdates
04-Apr-2018 05:24 Geno Added
14-Apr-2018 09:15 gerard57 Updated [Total fatalities, Other fatalities, Source, Narrative]
15-Apr-2018 00:21 Geno Updated [Aircraft type, Registration, Cn, Operator, Source, Narrative]
16-Jul-2018 16:15 Anon. Updated [Narrative]
16-Jul-2018 18:47 Captain Adam Updated [Registration, Narrative]
17-Jul-2018 14:05 Iceman 29 Updated [Time, Location, Nature, Source, Embed code, Damage, Narrative, Photo, ]
11-Nov-2019 17:42 ASN Update Bot Updated [Time, Operator, Departure airport, Destination airport, Source, Embed code, Damage, Narrative, Accident report, ]
29-Jul-2020 08:19 Captain Adam Updated [Location, Source, Embed code, Narrative, Accident report, ]

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