# NTSB Accident ERA11LA428
> **SCHWEIZER 269C** · 2011-07-29 · Darlington, MD, USA · MINR
## Event
- **NTSB number:** ERA11LA428
- **Event ID:** 20110729X03738
- **Type:** Accident
- **Date:** 2011-07-29
- **Location:** Darlington, MD, USA
- **Coordinates:** 39.65139, -76.236946
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 1
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** SCHWEIZER
- **Model:** 269C
- **Registration:** N39SH
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAWN
- **Weather:** VMC
## Probable cause

Inadequate maintenance of the helicopter's landing gear dampers, which resulted in a main rotor out-of-balance condition and ground resonance encounter.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA11LA428) · AI Analytics · CC0 1.0*