ASN Wikibase Occurrence # 168758
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| Date: | Wednesday 22 September 2010 |
| Time: | 15:52 LT |
| Type: |  Bell 412EP |
| Owner/operator: | New York City Police |
| Registration: | N412PD |
| MSN: | 36142 |
| Year of manufacture: | 2008 |
| Total airframe hrs: | 359 hours |
| Engine model: | Pratt & Whitney Canada PT6T-3D |
| Fatalities: | Fatalities: 0 / Occupants: 6 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Jamaica Bay, near NYPD Heliport, NY -
 United States of America
|
| Phase: | Approach |
| Nature: | Aerial patrol |
| Departure airport: | Floyd Bennett Field |
| Floyd Bennett Field | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
At the end of a 42 minute patrol, at approx. 300ft on final approach to its home heliport, the flight crew heard a loud sound from the engine compartment, which was immediately followed by a loss of main rotor rpm. The crew subsequently performed an autorotation to the water below, and upon contact with the water, the installed flotation devices deployed. One main rotor blade broke after striking the forward fuselage
The NTSB probable cause(s): The fatigue fracture of the reduction gearbox output drive gear*, which resulted in the loss of power output from the engines to the helicopter rotor blade system and a subsequent forced landing. The fracture of the output drive gear was caused by a fatigue crack that originated in a helical tooth root most likely as a result of hydrogen embrittlement during the manufacturing process.
*This is a PWC PT6T component
Accident investigation:
 |
|
Sources:
https://cityroom.blogs.nytimes.com/2010/09/22/police-helicopter-makes-emergency-landing-in-jamaica-bay/?_php=true&_type=blogs&_r=0
https://www.pprune.org/rotorheads/428370-nypd-helicopter-hard-landing-ditching-water.html
http://www.ntsb.gov/aviationquery/brief.aspx?ev_id=20100923X80619
http://www.nydailynews.com/new-york/nypd-detectives-sue-maker-helicopter-splash-landed-2010-article-1.1469180
Location
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Aug-2014 17:18 | Aerossurance | Added |
| 16-Aug-2014 19:02 | Aerossurance | Updated [Source] |
| 16-Aug-2014 19:05 | Aerossurance | Updated [Embed code] |
| 03-Sep-2014 15:51 | TB | Updated [Location, Nature, Damage] |
| 24-Sep-2017 18:22 | Aerossurance | Updated [Nature, Damage] |
| 11-Oct-2021 14:49 | harro | Updated [Date, Accident report] |
| 31-May-2023 04:27 | Ron Averes | Updated [[Date, Accident report]] |
Corrections or additions? ... Edit this accident description
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