ASN Wikibase Occurrence # 372426
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| Date: | Wednesday 12 August 1987 |
| Time: | 09:00 LT |
| Type: |  Bell 206L-1 |
| Owner/operator: | Petroleum Helicopters,inc. |
| Registration: | N2764F |
| MSN: | 45279 |
| Year of manufacture: | 1979 |
| Total airframe hrs: | 6752 hours |
| Engine model: | Allison 250-C28 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | New Iberia, LA -
 United States of America
|
| Phase: | Landing |
| Nature: | Training |
| Departure airport: | Lafayette, LA (KLFT) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
CREW PERFORMING PRACTICE TOUCHDOWN AUTOROTATIONS DURING A TRNG FLT. ON 4TH AUTOROTATION, ACFT TOUCHED DOWN WITH EXCESS GRND SPEED AND SKIDDED FOR APPROX 75' ON THE WET, SOFT GRASS. WHEN CREW APPLIED POWER BACK TO FLIGHT RPM THEY HEARD A GRINDING SOUND AND FELT A VIBRATION. VISUAL INSP REVEALED THAT THE TAILBOOM HAD SEPARATED AFT OF THE ATTACHMENTS DUE TO RESONANCE. THIS ACFT IS SUBJECT TO RESONANCE IF ROTOR RPM IS ALLOWED TO DECAY BELOW 70% DURING TOUCHDOWN AUTOROTATIONS OR DURING LENGTHY GROUND RUNS.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB FTW87LA195
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Mar-2024 16:52 | ASN Update Bot | Added |
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