ASN Wikibase Occurrence # 309787
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| Date: | Wednesday 15 July 1992 |
| Time: | 16:55 LT |
| Type: | BELL 47D-1G |
| Owner/operator: | Robert Hunt |
| Registration: | N3109G |
| MSN: | 407 |
| Total airframe hrs: | 6397 hours |
| Engine model: | FRANKLIN 6V-335-A |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Southwick, MA -
 United States of America
|
| Phase: | Taxi |
| Nature: | Unknown |
| Departure airport: | (6MA3) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT WAS MAKING A RIGHT TURN DURING A HOVER-TAXI CHECK AS PART OF A POST-MAINTENANCE FLIGHT TEST. ACCORDING TO THE PILOT, THE HELICOPTER CONTINUED TO ROLL RIGHT (UNCOMMANDED), AND HE WAS UNABLE TO REGAIN CONTROL DESPITE USING LEFT CYCLIC INPUT. THE MAIN ROTORS STRUCK THE GROUND, AND THE HELICOPTER IMPACTED THE GROUND IN A NOSE DOWN, RIGHT BANK, ATTITUDE. EXAMINATION OF THE HELICOPTER INCLUDED A TEST OF THE HYDRAULIC DAMPERS WHICH WERE CONNECTED TO THE STABILIZER BAR ASSEMBLY. THE TEST REVEALED THAT THE DAMPERS WERE NOT ADJUSTED ADEQUATELY, WHICH RESULTED IN LITTLE TO NO RESPONSE TO CYCLIC CONTROL INPUT.
Probable Cause: IMPROPER ADJUSTMENT OF THE STABILIZER CONTROL SYSTEM BY MAINTENANCE PERSONNEL.
Accident investigation:
 |
|
Sources:
NTSB BFO92LA102
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Mar-2023 16:49 | IJC64 | Added |
| 10-Apr-2024 19:34 | ASN Update Bot | Updated [Time, Aircraft type, Operator, Total fatalities, Total occupants, Other fatalities, Phase, Nature, Departure airport, Source, Damage, Narrative, Accident report] |
Corrections or additions? ... Edit this accident description
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