# Accident 19900726028719A: Airtrc AT401, San Joaquin, CA, July 26, 1990

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: July 26, 1990, 00:30 local time
- Place: San Joaquin, CA
- Damage: Substantial damage
- Phase of flight: Fcd/Prec Ldg From Cruise
- Operating rules: Agricultural (Part 137)
- Operator: PWOG
- Location: 36.5898° N, 120.1909° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=36.5898&lon=-120.1909&mi=10
- Aircraft: N7315S, a cancelled registration (https://openairdocs.org/deregistered/N7315S-2009-10-22) (OpenAirDocs)
- Registry model: Air Tractor AT-401 (registry code 0390204, https://openairdocs.org/model/air-tractor-at-401) (OpenAirDocs)
- Registry engine: Pratt & Whitney R1340 series (registry code 52016, https://openairdocs.org/engine/pratt-whitney-r1340-series) (OpenAirDocs)
- Reported make and model: AIRTRC AT401
- Reported engine: PWA R1340AN1
- People aboard: 1
- Fatal injuries: 1
- Pilot flight hours: 16,500 total, 8,000 in this make and model, 175 in the last 90 days
- NTSB investigation: [NTSB LAX90DVA07](https://openairdocs.org/ntsb/LAX90DVA07) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19900726028719A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

ENGINE BLEW A CYLINDER DURING A SPRAY RUN TURN AROUND. AIRCRAFT FLIPPED OVER LANDING IN A SUGAR BEET FIELD.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX90DVA07](https://openairdocs.org/ntsb/LAX90DVA07), Jul 26, 1990: Air Tractor AT-401 (N7315S), San Joaquin, CA, substantial damage, 1 fatal. Probable cause: THE FAILURE OF THE NO. 4 CYLINDER HEAD.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.