ASN Wikibase Occurrence # 359083
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| Date: | Tuesday 25 April 1995 |
| Time: | 19:50 LT |
| Type: |  Bell 206-L4 |
| Owner/operator: | California Highway Patrol |
| Registration: | N6197N |
| MSN: | 52014 |
| Year of manufacture: | 1993 |
| Total airframe hrs: | 948 hours |
| Engine model: | Allison250-C30P |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Thermal, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Unknown |
| Departure airport: | (KTRM) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE CFI WAS DEMONSTRATING A HOVERING AUTOROTATION TO TOUCHDOWN. THE HELICOPTER WAS EQUIPPED WITH FULL SKID SHOES, AND A QUARTERING HEADWIND OF 15 KNOTS, GUSTING TO 30 KNOTS, EXISTED. THE CFI APPLIED FULL UP COLLECTIVE TO CUSHION THE LANDING. THE TOUCHDOWN WAS SMOOTH, BUT THE HELICOPTER CAME TO AN ABRUPT STOP. WHEN THE CFI RETURNED TO THE PAD, HE NOTICED THAT THE TAILBOOM SKIN WAS WRINKLED. THE MANUFACTURER HAD ADDRESSED THE TAILBOOM WRINKLING IN AN OPERATIONAL SAFETY NOTICE (OSN) WHICH WAS INCORPORATED IN THE HELICOPTER FLIGHT MANUAL. THE OSN STATES THAT THE MAIN ROTOR BLADES RPM SHOULD NOT BE LESS THAN 70 PERCENT, AND THAT THE COLLECTIVE SHOULD BE IMMEDIATELY LOWERED ON TOUCHDOWN.
Probable Cause: The CFI's failure to follow the flight manual procedures by using full up collective during an autorotation landing.
Accident investigation:
 |
|
Sources:
NTSB LAX95TA171
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Mar-2024 06:46 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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