# N421BF: 2025 Bryan Ferwerda S21 OUTBACK

- Status: Valid registration
- Airframe: [Bryan Ferwerda S21 OUTBACK](https://openairdocs.org/model/bryan-ferwerda-s21-outback) (registry code 056426M, 2 seats)
- Engine: [Titan IO-340](https://openairdocs.org/engine/titan-io-340) (registry code 59690)
- Serial number: 03240374
- Year built: 2025
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Kit: Rans Designs Inc S-21 OUTBOUND
- Airworthiness: Experimental, amateur built
- Airworthiness date: September 10, 2025
- Certificate issued: July 23, 2025
- Expires: July 31, 2032
- Mode S code: A4FF75
- Registered owner: [Ferwerda Bryan R](https://openairdocs.org/faa-owner/FERWERDA%20BRYAN%20R)
- Location: [Sioux Falls, SD](https://openairdocs.org/faa-place/SD/Sioux%20Falls)
- Owner type: Individual
- Owner's area on the map: 43.4766° N, 96.7043° W: Placed by OpenAirDocs at the center of ZIP code 57108, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=421BF
- Page: https://openairdocs.org/aircraft/N421BF

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 (Bryan Ferwerda S21 OUTBACK)

None in force.

### Matched by engine (Titan IO-340)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N421BF.

## FAA accident and incident reports

None matched to N421BF.

## 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 N421BF

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N421BF before.

- [Cancelled 2009-04-09](https://openairdocs.org/deregistered/N421BF-2009-04-09): Cessna 421A, S/N 421A0055, built 1969. Owner: [Preferred Airparts LLC](https://openairdocs.org/faa-owner/PREFERRED%20AIRPARTS%20LLC), [Kidron, OH](https://openairdocs.org/faa-place/OH/Kidron)

## Related

- Other Bryan Ferwerda S21 OUTBACK aircraft: https://openairdocs.org/model/bryan-ferwerda-s21-outback/aircraft.md
- The Titan IO-340 engine: https://openairdocs.org/engine/titan-io-340.md

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