ASN Wikibase Occurrence # 354617
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| Date: | Tuesday 7 April 1998 |
| Time: | 20:30 LT |
| Type: |  RotorWay Exec 162F |
| Owner/operator: | Private |
| Registration: | N623LB |
| MSN: | 6189 |
| Total airframe hrs: | 52 hours |
| Engine model: | Rotorway 162F |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Canton, GA -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | (N/A) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot stated he experienced a loss of rotor rpm during initial takeoff climb over a lake. He said he 'added max power & decreased collective; no increase in rotor rpm noted.' The helicopter was turned toward the shore, and the pilot lowered the collective pitch to increase rotor rpm, but with negative results. Subsequently, the helicopter settled into the water and sank. Examination of the engine control unit (ECU) (at an authorized repair facility) revealed the engine rpm steadily decreased as the percentage of throttle position was increased 'right up until impact, eleven (11) seconds from lift off.' An FAA inspector, who participated in the investigation, stated 'The pilot apparently applied too much collective pitch too soon and it appears he basically got behind the power curve.'
Probable Cause: the pilot's improper use of throttle and collective pitch during initial takeoff climb, which resulted in a decay of rotor rpm and settling of the helicopter into a lake.
Accident investigation:
 |
|
Sources:
NTSB MIA98LA122
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Mar-2024 16:27 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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