# NTSB Accident ERA10TA493
> **BELL 412** · 2010-09-22 · Brooklyn, NY, USA · MINR
## Event
- **NTSB number:** ERA10TA493
- **Event ID:** 20100923X80619
- **Type:** Accident
- **Date:** 2010-09-22
- **Location:** Brooklyn, NY, USA
- **Coordinates:** 40.599998, -73.899444
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 6
- **Uninjured:** 0
- **Total aboard:** 6
## Aircraft
- **Make:** BELL
- **Model:** 412
- **Registration:** N412PD
- **FAR Part:** PUBU
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

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.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA10TA493) · AI Analytics · CC0 1.0*