ASN Wikibase Occurrence # 385463
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| Date: | Tuesday 7 August 2001 |
| Time: | 18:30 LT |
| Type: |  Enstrom 280FX |
| Owner/operator: | |
| Registration: | N724BF |
| MSN: | 2049 |
| Total airframe hrs: | 648 hours |
| Engine model: | Lycoming HIO-360-F1AD |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Ouray, CO -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | Montrose Regional Airport, CO (MTJ/KMTJ) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Prior to landing the helicopter at an altitude of about 12,000 feet mean sea level, the pilot completed a "power check," and at that time, the engine was able to develop 39 inches of manifold pressure. While on short final, the pilot added power, however, the engine could only achieve 31 inches of manifold pressure. The pilot then executed a forced landing to a grassy area at the top of a slope. Approximately 10 feet agl, the low rotor rpm horn sounded, and the pilot "cushioned the landing with little power." Subsequently, the helicopter slid off the slope, rolled over, and came to rest on its right side. The helicopter was recovered and examined by a helicopter mechanic and the pilot. During the examination, the mechanic found that "the wastegate linkage sheath was in its detent." However, "the sheath took two fingers with very light pressure to pull it out of its detent." The mechanic attributed the ease with which he was able to pull the sheath out of the detent to "the ball plunger on the wastegate linkage not being torqued." In the mechanic's opinion, "between the light torque on the ball plunger and the heat in the engine compartment, the sheath for the wastegate linkage would at times slide on the inside shaft. Without collective, throttle, and wastegate rigging working together, this would greatly affect power or lack of power."
Probable Cause: the partial loss of engine power due to the slippage of the wastegate linkage as a result of the plunger on the linkage being undertorqued by an unknown person. A contributing factor was the lack of suitable terrain for the forced landing.
Accident investigation:
 |
|
Sources:
NTSB DEN01LA141
History of this aircraft
Other occurrences involving this aircraft
| 15 February 2024 | N899JS | One PFT LLC | 0 | Lewistown Municipal Airport (LWT/KLWT), Lewistown, MT | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 04-Apr-2024 18:54 | ASN Update Bot | Added |
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