# NTSB Accident ERA22LA269
> **WALTER S JOHNSON III AR-1** · 2022-06-11 · Butler, PA, USA · NONE
## Event
- **NTSB number:** ERA22LA269
- **Event ID:** 20220616105269
- **Type:** Accident
- **Date:** 2022-06-11
- **Location:** Butler, PA, USA
- **Coordinates:** 40.776583, -79.951083
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** WALTER S JOHNSON III
- **Model:** AR-1
- **Registration:** N688G
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot’s failure to monitor rotor disk speed on takeoff, which resulted in blade flapping and the main rotor blades striking the gyroplane’s tail assembly.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA22LA269) · AI Analytics · CC0 1.0*