# NTSB Accident ERA16LA202
> **BELL 407** · 2016-06-03 · Mountain City, TN, USA · MINR
## Event
- **NTSB number:** ERA16LA202
- **Event ID:** 20160603X45936
- **Type:** Accident
- **Date:** 2016-06-03
- **Location:** Mountain City, TN, USA
- **Coordinates:** 36.474723, -81.804725
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 3
- **Total aboard:** 4
## Aircraft
- **Make:** BELL
- **Model:** 407
- **Registration:** N4999
- **FAR Part:** 135
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

An incorrect and unapproved repair of the engine compressor diffuser performed by a machinist at a repair facility, which resulted in failure of the compressor diffuser aft plate and a partial loss of engine power.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA16LA202) · AI Analytics · CC0 1.0*