ASN Wikibase Occurrence # 292213
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| Date: | Thursday 8 June 2006 |
| Time: | 11:32 LT |
| Type: |  Fairchild Hiller FH-1100 |
| Owner/operator: | Helicopters Of Nw Florida, Inc. |
| Registration: | N4035G |
| MSN: | 502 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 370 hours |
| Engine model: | Rolls-Royce 250-C208 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Navarre, Florida -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Navarre, FL (52FD) |
| Century, FL | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While flying in straight and level flight at 600 feet and approximately 100 miles-per-hour, undetected fatigue cracks in the stainless steel plates of one of the tail rotor blade tension-torsion bars resulted in in-flight separation of one tail rotor blade, and subsequent structural separation of a portion of the ventral fin. The pilot executed an autorotative landing to shallow water and there were no injuries to the pilot or pilot-rated passenger. Eight of the 11 stainless steel plates of the tension-torsion bar assembly exhibited fatigue which originated from stress risers created during the manufacturing process (punching) of the holes of the plates. Reaming of the holes did not eliminate the surface created during the punching process. This problem was previously noted to exist and corrective action was taken in the form of an airworthiness directive (AD), but the AD was not applicable to the accident helicopter because the serial number of the accident tension-torsion bars was outside of the scope of the AD.
Probable Cause: The inadequate manufacturing of the plates of the tail rotor tension-torsion bar assembly resulting in fatigue failure.
Accident investigation:
 |
|
Sources:
NTSB MIA06LA126
History of this aircraft
Other occurrences involving this aircraft
| 18 February 1985 | N4035G | Private | 0 | Steamboat Sprng, CO | |
sub |
| 6 October 2016 | N4035G | Private | 2 | Lino Lakes, Anoka County, MN | |
w/o |
| Mast bumping | ||||||
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 08-Oct-2022 15:49 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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