ASN Wikibase Occurrence # 352793
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Monday 16 August 1999 |
| Time: | 20:00 LT |
| Type: |  Bell 47G-2 |
| Owner/operator: | Versatile Helicopters Inc. |
| Registration: | N1774 |
| MSN: | SA52 |
| Total airframe hrs: | 9030 hours |
| Engine model: | Lycoming VO-435-A1D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Ardmore, OK -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | (1F0) |
| Oklahoma City, OK | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The flight instructor heard 'a banging noise accompanied with an increase of engine rpm and a decrease of rotor rpm' during takeoff from a high hover. The helicopter entered a left turn and the pilot rolled the throttle off to enter an autorotation. The helicopter landed hard with low rotor rpm. The main rotor blades contacted the tailboom, and the skid landing gear collapsed. Examination of the engine, main transmission, and free wheeling clutch revealed no discrepancies that would have prevented normal flight operations. Prior to commencing the planned dual cross country flight, the helicopter's fuel system had been filled. The density altitude was calculated at 3,040 feet. The operator stated that the accident could have been prevented by 'not hovering out of ground effect at maximum gross weight with a density altitude of 3,000 foot, and better RPM control.'
Probable Cause: The pilot's failure to maintain rotor rpm which resulted in a hard landing. A factor was the high density altitude.
Accident investigation:
 |
|
Sources:
NTSB FTW99LA224
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Mar-2024 17:59 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation