# NTSB Accident WPR11CA358
> **MCDONALD LYNN B AVID FLYER MARK IV** · 2011-07-31 · Yamhill, OR, USA · NONE
## Event
- **NTSB number:** WPR11CA358
- **Event ID:** 20110802X80758
- **Type:** Accident
- **Date:** 2011-07-31
- **Location:** Yamhill, OR, USA
- **Coordinates:** 45.361389, -123.353057
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** MCDONALD LYNN B
- **Model:** AVID FLYER MARK IV
- **Registration:** N30456
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot’s loss of directional control during landing rollout due to an unlocked tail wheel that was caused by a degradation of the tailwheel assembly mounting angle.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR11CA358) · AI Analytics · CC0 1.0*