# NTSB Accident LAX88FA241
> **HELIO HST-550A** · 1988-06-30 · PERRIS, CA, USA · FATL
## Event
- **NTSB number:** LAX88FA241
- **Event ID:** 20001213X25979
- **Type:** Accident
- **Date:** 1988-06-30
- **Location:** PERRIS, CA, USA
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** HELIO
- **Model:** HST-550A
- **Registration:** N9991F
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

FAILURE OF THE ELECTRICAL STABILIZER TRIM CONTROL THAT RESULTED IN AN UNCOMMANDED FULL NOSE DOWN ELEVATOR TRIM COMMAND.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX88FA241) · AI Analytics · CC0 1.0*