ASN Wikibase Occurrence # 31147
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| Date: | Tuesday 10 September 1996 |
| Time: | 08:50 LT |
| Type: |  Bell UH-1H |
| Owner/operator: | Idaho Helicopters, Inc. |
| Registration: | N23Y |
| MSN: | 4243 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 7403 hours |
| Engine model: | Lycoming T53-L-703 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Leadville, Colorado -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | (KLXV) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The helicopter crew was conducting high altitude flight tests pursuant to obtaining two Supplemental Type Certificates. From an altitude of 200 feet, and at 8,000 pounds gross weight, the pilot initiated an intentional autorotation at 42 knots with a one second delay before lowering the collective control. The pilot said he was unable to arrest the descent rate as the helicopter approached the runway at 40 knots. The helicopter was destroyed when it impacted the runway. A video camera was used to record the flight tests. A review of the tape disclosed that on at least two previous autorotations, the tail boom stinger struck the ground first. According to an FAA helicopter operations inspector, this was indicative that the pilot was 'outside the low end of the height-velocity curve.' He said that 'either there was insufficient airspeed for the altitude used, or there was insufficient altitude for the airspeed used.'
Probable Cause: The pilot's improper inflight planning/decision in that he used an inadequate airspeed or an inadequate altitude, or both, for the intentional autorotation.
Accident investigation:
 |
|
Sources:
NTSB FTW96LA380
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 27-Sep-2008 01:00 | ASN archive | Added |
| 31-Oct-2011 09:49 | Dr. John Smith | Updated [Operator, Total fatalities, Total occupants, Other fatalities, Location, Country, Phase, Nature, Departure airport, Destination airport, Source, Damage, Narrative] |
| 08-Apr-2024 19:00 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Damage, Narrative, Category, Accident report] |
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