ASN Wikibase Occurrence # 178853
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| Date: | Wednesday 19 August 2015 |
| Time: | 22:30 |
| Type: |  Cessna 172P Skyhawk |
| Owner/operator: | Private |
| Registration: | N62731 |
| MSN: | 17275330 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 9056 hours |
| Engine model: | Lycoming Engines O-320-D2J |
| Fatalities: | Fatalities: 2 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | NE of Avalanche Gulch and Helena, MT -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Helena, MT (HLN) |
| WHT SPHR SPGS, MT (7S6) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The non-instrument-rated pilot notified his wife at 2211 that he would be departing the airport momentarily. The direct route to the destination of the dark night cross-country flight crossed a mountain range with elevations over 7,200 ft. The following morning, an emergency locator transmitter signal was detected, and the wreckage was subsequently located in the mountains at an elevation of about 5,000 ft along the direct route of flight. The wreckage pattern and ground scars indicated that the airplane impacted a rock formation on the face of a mountain during a steep right turn. An examination of the airframe and engine did not reveal any preimpact mechanical malfunctions or anomalies that would have precluded normal operation.
Although the pilot had accumulated some experience crossing the mountain range, he had never completed this flight in nighttime conditions, and he had only 3.8 hours of night flight experience. The pilot\'s wife reported that she had made the flight several times with the pilot, and he would typically fly over the mountain range unless the clouds were low, in which case he would take a longer route to avoid the mountains. The departure airport was reporting an overcast cloud layer that was about 8,000 ft mean sea level. Further, a witness at the destination airport reported that the sky condition was \"pitch black,\" which was likely the result of a partially illuminated moon blocked by the overcast layer. In addition, mountain obscuration due to smoke and haze was present at the time of the accident, which would have further decreased the pilot\'s ability to recognize obstructions. As stated in a January 2008 National Transportation Safety Board safety alert, Controlled Flight Into Terrain in Visual Conditions, \"darkness may render visual avoidance of high terrain nearly impossible,\" and \"the absence of ground lights may result in loss of horizon reference.\"
It is likely that the airplane collided with terrain because the pilot could not see and avoid the surrounding terrain given the dark night conditions and mountain obscuration. Pilot spatial disorientation may also have occurred due to multiple risk factors including the pilot\'s lack of night flight proficiency and his absence of mountain flying experience in dark night conditions. Because the airplane was in a steep turn, it could not be determined whether the pilot was trying to avoid terrain that he saw at the last minute or if he was disoriented and inadvertently banked the airplane.
Probable Cause: The non-instrument-rated pilot's decision to conduct a cross-country flight over a mountain range in dark night conditions with limited night flight experience, which resulted in a collision with mountainous terrain.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Aug-2015 02:26 | Geno | Added |
| 21-Aug-2015 19:25 | Geno | Updated [Aircraft type, Registration, Cn, Operator, Nature, Source, Damage, Narrative] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 27-Feb-2017 17:42 | PiperOnslaught | Updated [Source, Narrative] |
| 18-Aug-2017 19:33 | ASN Update Bot | Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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