ASN Wikibase Occurrence # 38032
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| Date: | Saturday 25 November 1995 |
| Time: | 16:54 LT |
| Type: |  Beechcraft C24R Sierra |
| Owner/operator: | First National Insurance |
| Registration: | N3729T |
| MSN: | MC-737 |
| Total airframe hrs: | 3311 hours |
| Engine model: | Lycoming IO-360-A1B6 |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Bozeman, MT -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Lewiston, ID (KLWS) |
| (KBZN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight was on an instrument flight rules (IFR) flight plan and had been cleared by air traffic control (ATC) for an instrument landing system (ILS) approach. The aircraft owner, along with the flight instructor, who completed the pilot's instrument training as well as his checkout in the accident aircraft, stated that they had instructed the pilot not to fly the accident aircraft in IFR conditions. The airplane was flown at an altitude of 13,000 feet for 32 minutes before commencing the approach, and it was not equipped with supplemental oxygen or cabin pressurization. The pilot failed to follow the specified ground track for the approach, and the airplane impacted mountainous terrain about 13-1/2 nautical miles north-northeast of the airport in heavy snow conditions. The accident site was approximately 15-1/2 nautical miles beyond the point where a turn onto the localizer was specified on the approach procedure. The airport did not have a control tower or approach control radar, and the airplane was not in radar contact with ATC at the time of the accident. A hunter near the accident site saw an airplane fly over his position at low altitude in heavy snowfall. He heard a loud metallic 'clank' about 20 to 30 seconds after the airplane disappeared from his view. Also, he noted the time on his watch, which corresponded to the estimated time of the accident.
Probable Cause: failure of the pilot to follow the specified approach track (proper IFR procedure), and his associated failure to maintain altitude or clearance from mountainous terrain. Factors relating to the accident were: the pilot's failure to abide by the aircraft owner's (dispatch) procedures, heavy snowfall, mountainous terrain, and possible pilot impairment from altitude hypoxia.
Accident investigation:
 |
|
Sources:
NTSB SEA96FA024
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 24-Oct-2008 10:30 | ASN archive | Added |
| 21-Dec-2016 19:23 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 09-Apr-2024 10:52 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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