# NTSB Accident ERA21LA262
> **MCDONNELL DOUGLAS HELICOPTER 369E** · 2021-06-18 · SWAN LAKE, NY, USA · SERS
## Event
- **NTSB number:** ERA21LA262
- **Event ID:** 20210621103303
- **Type:** Accident
- **Date:** 2021-06-18
- **Location:** SWAN LAKE, NY, USA
- **Coordinates:** 41.734462, -74.759441
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 2
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** MCDONNELL DOUGLAS HELICOPTER
- **Model:** 369E
- **Registration:** N371EE
- **FAR Part:** 133
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's failure to maintain adequate clearance from the power transmission tower structure during powerline maintenance work, which resulted in the helicopter's main rotor striking the lifeline support bracket for the tower catwalk and the subsequent loss of control and collision with terrain.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA21LA262) · AI Analytics · CC0 1.0*