ASN Wikibase Occurrence # 372539
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| Date: | Tuesday 28 July 1987 |
| Time: | 17:50 LT |
| Type: |  Aerospatiale AS350D |
| Owner/operator: | Jones,jones & Welch |
| Registration: | N350AP |
| MSN: | 1252 |
| Year of manufacture: | 1980 |
| Total airframe hrs: | 1280 hours |
| Engine model: | LYCOMING LTS-101-60DA2 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Nantucket, MA -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Nantucket, MA (ACK |
| Hyannis, MA (KHYA) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE FLIGHT WAS ENROUTE FROM NANTUCKET TO HYANNIS WHEN THE PILOT HEARD A LOUD BANG FOLLOWED BY A SEVERE VIBRATION, LOSS OF POWER TO THE MAIN ROTOR SYSTEM, AND A LOSS OF HYDRAULIC PRESSURE. THE HELICOPTER MADE AN AUTOROTATIVE LANDING IN WATER ABOUT 25 FEET IN FRONT OF A FISHING BOAT AND 8 MILES NORTH OF NANTUCKET, MASSACHUSETTS, WHILE ON A BUSINESS FLIGHT. THE HELICOPTER EMERGENCY FLOATS WERE AT THE FACTORY BEING REPAIRED. THE PILOT EXITED WITH MINOR INJURIES AND THE HELICOPTER SANK INTO THE ATLANTIC OCEAN. THE HELICOPTER WAS RECOVERED FROM THE WATER. THE ENGINE TO THE MAIN ROTOR GEARBOX DRIVESHAFT ASSEMBLY AND A GIMBAL JOINT ASSEMBLY WERE EXAMINED IN THE NTSB MATERIALS LABORATORY. THE MAJORITY OF THE DAMAGE OCCURRED IN THE AREA OF THE FORWARD FLEXIBLE COUPLING. THE INTERNAL SURFACES OF THE JUNCTION CASE HAD EXPERIENCED SEVERE ROTATIONAL DAMAGE IN THE VICINITY OF THE GIMBAL JOINT PIVOT POINTS. THE DAMAGE INCLUDED DEEP CIRCUMFERENTIAL CHANNELS CUT INTO THE CASE AND SEVERE HEATING/FRETTING.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB NYC87LA220
History of this aircraft
Other occurrences involving this aircraft
| 1 April 1990 | N350AP | Macaw Helicopters | 0 | Philippine Sea, off Saipan Island |  |
w/o |
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Mar-2024 18:06 | ASN Update Bot | Added |
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