# NTSB Accident ERA17LA307
> **CESSNA U206** · 2017-09-01 · Harpswell, ME, USA · MINR
## Event
- **NTSB number:** ERA17LA307
- **Event ID:** 20170905X90624
- **Type:** Accident
- **Date:** 2017-09-01
- **Location:** Harpswell, ME, USA
- **Coordinates:** 43.819999, -69.919998
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** CESSNA
- **Model:** U206
- **Registration:** N4615X
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

A total loss of engine power due to maintenance personnel's failure to apply proper torque to the cylinder flange nuts and through bolts, which resulted in shifting of the Nos. 1, 2, and 3 main bearings, loss of lubrication, and failure of the crankshaft.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA17LA307) · AI Analytics · CC0 1.0*