# NTSB Accident LAX89DVM04
> **PROGRESS AERO R&D DISCOVERY** · 1989-07-02 · CHUALAR, CA, USA · SERS
## Event
- **NTSB number:** LAX89DVM04
- **Event ID:** 20001213X28855
- **Type:** Accident
- **Date:** 1989-07-02
- **Location:** CHUALAR, CA, USA
- **Coordinates:** 36.569877, -121.440956
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** PROGRESS AERO R&D
- **Model:** DISCOVERY
- **Registration:** N81D
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE EXPERIMENTAL AIRCRAFT'S INADVERTENT ENTRY INTO A NON-RECOVERABLE FLAT SPIN DURING A SLOW AIRSPEED TEST; THE AERODYNAMIC CHARACTERISTICS THAT PRODUCED THE SPIN WERE NOT DETERMINED.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX89DVM04) · AI Analytics · CC0 1.0*