# NTSB Accident WPR20LA193
> **Thatcher CX4** · 2020-06-24 · Upland, CA, USA · SERS
## Event
- **NTSB number:** WPR20LA193
- **Event ID:** 20200624X54441
- **Type:** Accident
- **Date:** 2020-06-24
- **Location:** Upland, CA, USA
- **Coordinates:** 34.109443, -117.694999
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** Thatcher
- **Model:** CX4
- **Registration:** N274DR
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The inflight separation of the propeller assembly due to a fatigue fracture of the crankshaft. Contributing to the accident was the pilot’s restricted visibility during landing, which resulted in an excessive approach speed, a long landing, and subsequent impact with terrain.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR20LA193) · AI Analytics · CC0 1.0*