ASN Wikibase Occurrence # 286958
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| Date: | Monday 25 May 2009 |
| Time: | 11:00 LT |
| Type: |  Enstrom 280C |
| Owner/operator: | Private |
| Registration: | N5699N |
| MSN: | 1220 |
| Total airframe hrs: | 1140 hours |
| Engine model: | Lycoming HIO-360 SER |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Ogden, Utah -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Ogden, UT |
| Ogden Municipal Airport, UT (OGD/KOGD) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that just after passing through takeoff translational lift, he noticed that the reciprocating engine was being over-boosted and that the main rotor blade RPM was drooping. He therefore lowered the collective in an attempt to lower the boost and to regain main rotor rpm, but the helicopter began to sink at a rate that made it necessary for him to immediately transition to a landing. After touching down on the ground, the skids partially collapsed, the helicopter pitched forward, and the main rotor blades flexed downward far enough to sever the tail boom. According to the pilot, the engine seemed to be running strong and smooth, and there did not appear to be any problems with the flight control system. No anomalies were found during a post-accident inspection of the airframe, nor during the engine test run.
Probable Cause: The pilot's improper use of the helicopter's collective both during the takeoff sequence and while attempting remedial action in response to an engine over-boost condition, which resulted in a hard precautionary landing.
Accident investigation:
 |
|
Sources:
NTSB WPR09LA261
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Oct-2022 18:40 | ASN Update Bot | Added |
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