ASN Wikibase Occurrence # 70281
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| Date: | Friday 4 December 2009 |
| Time: | 18:45 |
| Type: |  Piper PA-31T Cheyenne II-XL |
| Owner/operator: | Tiffin Aire |
| Registration: | N85EM |
| MSN: | 31T-8166055 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 9436 hours |
| Engine model: | P&W Canada PT6A-60A |
| Fatalities: | Fatalities: 1 / Occupants: 1 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Harrison, MI -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Charlevoix Municipal Airport, MI (CVX/KCVX) |
| Seneca County Airport, OH (16G) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Shortly after takeoff in the pressurized twin-engine airplane, the pilot was cleared to climb and maintain 16,000 feet. The pilot reported passing through instrument conditions with heavy snow and that he cleared the tops of the clouds at 7,000 feet. The pilot was then cleared to climb and maintain flight level (FL) 230. Radar data showed the airplane's altitude and course varied throughout the flight after having reached FL 230. Several times during the flight the air traffic controller questioned the pilot regarding his altitude and/or course. Each time the pilot responded that he was at the correct altitude and/or course. The radar data showed that after each of these conversations, the airplane would return to the assigned altitude and/or course. The controller then informed the pilot that, because radar showed the airplane’s altitude fluctuating between FL 224 and FL 237, he was going to have to descend out of positive controller airspace. The pilot acknowledged this transmission. The controller instructed the pilot to descend to 17,000 feet. The last transmission from the pilot was when he acknowledged the descent. Radar data showed that one minute later the airplane was at FL 234. During the last minute and 12 seconds of radar data, the airplane reversed its course and descended from FL 233 to FL 214, at which time radar data was lost. Witnesses reported hearing loud engine sounds and seeing the airplane in a spiraling descent until ground impact. Postaccident inspection of the engines did not identify any anomalies that would have precluded normal operation. Most of the fuselage was consumed by fire; however, flight control continuity was established. Given the pilot’s experience and the flight’s altitude and course variations the investigation considered that the pilot may have suffered from hypoxia; however, due to the postimpact fire the functionality of the airplane’s pressurization system could not be observed and no conclusive determination could be made that the pilot was impaired.
Probable Cause: A loss of aircraft control for undetermined reasons.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: 2. FAA: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?omni=Home-N-Number&nNumberTxt=85EM
Location
Images:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Dec-2009 08:24 | Alpine Flight | Added |
| 05-Dec-2009 09:25 | RobertMB | Updated |
| 07-Dec-2009 00:45 | slowkid | Updated |
| 05-Oct-2010 15:32 | Anon. | Updated |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 06-Aug-2017 16:03 | TB | Updated [Aircraft type, Location, Source, Narrative] |
| 17-Sep-2017 21:15 | Dr. John Smith | Updated [Time, Location, Nature, Departure airport, Destination airport, Source, Narrative] |
| 17-Sep-2017 21:20 | Dr. John Smith | Updated [Location, Source] |
| 02-Dec-2017 17:59 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
| 07-Feb-2021 20:58 | Captain Adam | Updated [Other fatalities, Location, Departure airport, Destination airport, Source, Narrative] |
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