# NTSB Accident ERA12LA368
> **SCHWEIZER 269C** · 2012-05-24 · Piney Flats, TN, USA · NONE
## Event
- **NTSB number:** ERA12LA368
- **Event ID:** 20120529X01210
- **Type:** Accident
- **Date:** 2012-05-24
- **Location:** Piney Flats, TN, USA
- **Coordinates:** 36.410831, -82.351112
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** SCHWEIZER
- **Model:** 269C
- **Registration:** N760DA
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The mechanic’s improper maintenance of the main transmission aft pinion nut and belt drive system, which resulted in the uncoupling of the tail rotor driveshaft and the subsequent loss of helicopter control.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA12LA368) · AI Analytics · CC0 1.0*