# N420QN: 1943 Noorduyn NORSEMAN MK VI

- Status: Valid registration
- Airframe: [Noorduyn NORSEMAN MK VI](https://openairdocs.org/model/noorduyn-norseman-mk-vi) (registry code 6330209, 9 seats)
- Engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016)
- Data sheets: [TCDS A-2-578](https://openairdocs.org/tcds/A-2-578) (Noorduyn Aviation Ltd.) (OpenAirDocs)
- Serial number: 139
- Year built: 1943
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: January 13, 2026
- Certificate issued: August 18, 2010
- Expires: April 30, 2028
- Mode S code: A4FD0A
- Registered owners: [Nichols Charles F Trustee](https://openairdocs.org/faa-owner/NICHOLS%20CHARLES%20F%20TRUSTEE), [Nichols Judith A Trustee](https://openairdocs.org/faa-owner/NICHOLS%20JUDITH%20A%20TRUSTEE)
- Location: [Baldwin Park, CA](https://openairdocs.org/faa-place/CA/Baldwin%20Park)
- Owner type: Co-owned
- Owner's area on the map: 34.0974° N, 117.9683° W: Placed by OpenAirDocs at the center of ZIP code 91706, 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=420QN
- Page: https://openairdocs.org/aircraft/N420QN

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. The registry lists only the engine series, so ADs for every Pratt & Whitney R1340 model are included.

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

### Matched by airframe (Noorduyn NORSEMAN MK VI)

None in force.

### Matched by engine (Pratt & Whitney R1340 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N420QN.

## FAA accident and incident reports

None matched to N420QN.

## 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) (5)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Noorduyn NORSEMAN MK VI)

- [STC SA01967WI](https://openairdocs.org/stc/SA01967WI): Use of GAMI G100UL High Octane Unleaded Avgas. General Aviation Modifications Inc
- [STC SA04776NY](https://openairdocs.org/stc/SA04776NY): The HIPEC Covering and Finishing System must be performed and maintained. HIPEC Aircraft Coatings Inc
- [STC SA01282NY](https://openairdocs.org/stc/SA01282NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K015 on aircraft powered by Pratt & Whitney radial reciprocating engine Series R-985, R-1340 and R-1830. Airwolf Filter Corporation
- [STC SA01734SE](https://openairdocs.org/stc/SA01734SE): Application of Stewart Systems synthetic fabric covering system to aircraft fuselage, wings, tail surfaces, control surfaces and related parts. Andrew D. Humphrey
- [STC SA8075SW](https://openairdocs.org/stc/SA8075SW): Installation of fiberglass covering. (M-62 SERIES PT-19) (G-73 SCHWEIZER). Razorback Fabrics Inc

## Related

- Other Noorduyn NORSEMAN MK VI aircraft: https://openairdocs.org/model/noorduyn-norseman-mk-vi/aircraft.md
- The Pratt & Whitney R1340 series engine: https://openairdocs.org/engine/pratt-whitney-r1340-series.md

---
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.