# N4518S: 2012 Schosanski John H COZY MK IV R

- Status: Valid registration
- Airframe: [Schosanski John H COZY MK IV R](https://openairdocs.org/model/schosanski-john-h-cozy-mk-iv-r) (registry code 056307Q, 4 seats)
- Engine: [Mazda 13B](https://openairdocs.org/engine/mazda-13b) (registry code 43201)
- Serial number: 0329
- Year built: 2012
- Type: Fixed wing single engine
- Engine type: Rotary
- Airworthiness: Experimental, amateur built
- Airworthiness date: May 31, 2012
- Certificate issued: August 5, 2011
- Expires: August 31, 2027
- Mode S code: A57954
- Registered owner: [Schosanski John H](https://openairdocs.org/faa-owner/SCHOSANSKI%20JOHN%20H)
- Location: [Napa, CA](https://openairdocs.org/faa-place/CA/Napa)
- Owner type: Individual
- Owner's area on the map: 38.4006° N, 122.1831° W: Placed by OpenAirDocs at the center of ZIP code 94558, within about 11 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4518S
- Page: https://openairdocs.org/aircraft/N4518S

From the FAA registry file of October 24, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination.

## ADs that may apply (OpenAirDocs): 0 in force

### Matched by airframe (Schosanski John H COZY MK IV R)

None in force.

### Matched by engine (Mazda 13B)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations (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 WPR17LA048](https://openairdocs.org/ntsb/WPR17LA048), Jan 4, 2017: Schosanski John H Cozy MK IV R (N4518S), Napa, CA, substantial damage. Probable cause: A partial loss of power due to missing apex seals.

## FAA accident and incident reports (1)

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.

- [Accident 20170104000989A](https://openairdocs.org/incident/20170104000989A), Jan 4, 2017: Schosanski John H COZY MK IV R (N4518S), Napa, CA, Substantial damage. On January 4, 2017, about 1430, an experimental amateur-built Schosanski, Cozy Mk IV R airplane, N4518S, experienced a total loss of engine power after an…

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs)

None matched to this aircraft's models.

## Earlier aircraft with N4518S

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N4518S before.

- [Cancelled 1994-05-17](https://openairdocs.org/deregistered/N4518S-1994-05-17): Beech A36, S/N E717. Owner: [Bickmann Randy E](https://openairdocs.org/faa-owner/BICKMANN%20RANDY%20E), [Spring Park, MN](https://openairdocs.org/faa-place/MN/Spring%20Park)

## Related

- Other Schosanski John H COZY MK IV R aircraft: https://openairdocs.org/model/schosanski-john-h-cozy-mk-iv-r/aircraft.md
- The Mazda 13B engine: https://openairdocs.org/engine/mazda-13b.md

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