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| Date: | Saturday 20 April 1991 |
| Time: | 08:00 LT |
| Type: |  Bell 47G-3B1 |
| Owner/operator: | Firefly Leasing, Inc. |
| Registration: | N1166W |
| MSN: | 2055 |
| Engine model: | Lycoming TVO-435-B1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Harwich, MA -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER EXPERIENCED A LOSS OF LIFT THROUGH THE MAIN ROTOR SYSTEM AND MADE A HARD LANDING. POST CRASH EXAMINATION SHOWED THE CLUTCH HAD RECENTLY BEEN REMOVED AND DISASSEMBLED FOR INSPECTION. THE CLUTCH WAS RETURNED TO SERVICE WITH ONLY 25 PERCENT SHOE/DRUM CONTACT. MAINTENANCE PERSONNEL HAD NOT FOLLOWED THE PROCEDURES CONTAINED IN THE OVERHAUL MANUAL.
Probable Cause: A FAILURE OF THE CLUTCH DURING TAKEOFF DUE TO IMPROPER MAINTENANCE PROCEDURES. FACTORS RELATED TO THE ACCIDENT WERE INSUFFICIENT ALTITUDE TO ESTABLISH AN AUTOROTATION.
Accident investigation:
 |
|
Sources:
NTSB NYC91DNA02
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 20-Mar-2024 10:04 | ASN Update Bot | Added |
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