# NTSB Accident LAX90DVA07
> **AIR TRACTOR AT-401** · 1990-07-26 · SAN JOAQUIN, CA, USA · FATL
## Event
- **NTSB number:** LAX90DVA07
- **Event ID:** 20001212X23717
- **Type:** Accident
- **Date:** 1990-07-26
- **Location:** SAN JOAQUIN, CA, USA
- **Coordinates:** 36.589801, -120.190879
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** AIR TRACTOR
- **Model:** AT-401
- **Registration:** N7315S
- **FAR Part:** 137
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** NDRK
- **Weather:** VMC
## Probable cause

THE FAILURE OF THE NO. 4 CYLINDER HEAD.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX90DVA07) · AI Analytics · CC0 1.0*