# N421PC: 2016 Collins William P PA-18 REPLICA

- Status: Valid registration
- Airframe: [Collins William P PA-18 REPLICA](https://openairdocs.org/model/collins-william-p-pa-18-replica) (registry code 05634O4, 2 seats)
- Engine: [Mattituck TMX IO-360](https://openairdocs.org/engine/mattituck-tmx-io-360) (registry code 59608)
- Serial number: TC0901057
- Year built: 2016
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Kit: Backcountry Super Cubs LLC PA-18 (REPLICA)
- Airworthiness: Experimental, amateur built
- Airworthiness date: June 4, 2016
- Certificate issued: November 5, 2015
- Expires: November 30, 2028
- Mode S code: A5009E
- Registered owner: [Collins William P](https://openairdocs.org/faa-owner/COLLINS%20WILLIAM%20P)
- Location: [Gambrills, MD](https://openairdocs.org/faa-place/MD/Gambrills)
- Owner type: Individual
- Owner's area on the map: 39.0556° N, 76.6905° W: Placed by OpenAirDocs at the center of ZIP code 21054, within about 2 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=421PC
- Page: https://openairdocs.org/aircraft/N421PC

From the FAA registry file of October 22, 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 (Collins William P PA-18 REPLICA)

None in force.

### Matched by engine (Mattituck TMX IO-360)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N421PC.

## FAA accident and incident reports

None matched to N421PC.

## 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 N421PC

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N421PC before.

- [Cancelled 2010-09-27](https://openairdocs.org/deregistered/N421PC-2010-09-27): Cessna 421C, S/N 421C0255. Exported to Canada. Owner: [None, OK](https://openairdocs.org/faa-place/OK/None)

## Related

- Other Collins William P PA-18 REPLICA aircraft: https://openairdocs.org/model/collins-william-p-pa-18-replica/aircraft.md
- The Mattituck TMX IO-360 engine: https://openairdocs.org/engine/mattituck-tmx-io-360.md

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