# Accident 20231002020729A: Cessna 340A, Hayward, CA, October 2, 2023

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: October 2, 2023, 12:00 local time
- Place: Hayward, CA
- Airport: Hayward Executive
- Damage: Substantial damage
- Phase of flight: Taxi
- Operating rules: General operating rules (Part 91)
- Location: 37.6589° N, 122.1217° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=37.6589&lon=-122.1217&mi=10
- Aircraft: N121CB, registered now (https://openairdocs.org/aircraft/N121CB) (OpenAirDocs)
- Registry model: Cessna 340A (registry code 2076405, https://openairdocs.org/model/cessna-340a) (OpenAirDocs)
- Registry engine: Continental TSIO-520 series (registry code 17040, https://openairdocs.org/engine/continental-tsio-520-series) (OpenAirDocs)
- Reported make and model: CESSNA 340A
- Reported engine: CONT MOTOR TSIO-520 SER
- People aboard: 2
- Fatal injuries: 0
- Other injuries: 2
- Pilot certificates: Commercial pilot
- Pilot flight hours: 2,000 total, 450 in this make and model, 17 in the last 90 days
- NTSB investigation: [NTSB WPR24LA003](https://openairdocs.org/ntsb/WPR24LA003) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20231002020729A

## Narrative

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

ON 10/2/2023 AT 1859Z, N121CB HAD A ACCIDENT WHILE TAXING. ACCORDING TO THE PILOT^PRIVACY DATA OMITTED^ AND HIS ^PRIVACY DATA OMITTED^ THEY WERE HEADING TO MONTEREY (MRY). ^PRIVACY DATA OMITTED^LOST CONSCIOUS AFTER HIS PREFLIGHT IN FRONT OF HIS HANGAR. HE REMEMBERED GETTING IN THE AIRCRAFT AND TURNING ON THE AVIONICS. ^PRIVACY DATA OMITTED^ATTEMPTED TO WAKE HIM UP. THE NEXT THING HE REMEMBERED HE WAS AT THE SCENE OF THE ACCIDENT AND TURNING OFF THE FUEL AND AVIONICS. THE AIRCRAFT WAS PARKED IN FRONT OF HANGER 3, HANGAR #3E FACING TAXIWAY A. THE AIRCRAFT ROLLED FORWARD ONTO TAXIWAY A, INTO THE GRASS BETWEEN A AND RUNWAY 28R. IN THE GRASS IT HIT A DRAINAGE SWALE AND CAME TO A STOP JUST BEFORE CROSSING RUNWAY 28R.

## 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 WPR24LA003](https://openairdocs.org/ntsb/WPR24LA003), Oct 2, 2023: Cessna 340A (N121CB), Hayward, CA, substantial damage. Probable cause: The pilot’s sudden incapacitation from effects of a previously undiagnosed underlying heart disease, which resulted in his loss of control of the airplane and subsequent impact with terrain.

## Other reports on N121CB (2)

Matched to the same aircraft by N-number and date.

- [Incident 20010923027669I](https://openairdocs.org/incident/20010923027669I), Sep 23, 2001: Cessna 340A (N121CB), Carthage, MS. (-23) Pilot departed mpe enroute to cdh in N121CB a CE-340 with 5 passengers on a part 91 flight. Aircraft was refueled prior to departure, pilot did not…
- [Incident 19970601023829I](https://openairdocs.org/incident/19970601023829I), Jun 1, 1997: Cessna 340A (N121CB), Camden, AR, Minor damage. Landed right main gear unlocked. Right prop hit. Sudden engine stop. Wing hit light. Rod end sheared on right gear.

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.

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