# N20861: 1955 Grumman HU-16D

- Status: Valid registration
- Airframe: [Grumman HU-16D](https://openairdocs.org/model/grumman-hu-16d) (registry code 3950413, 27 seats)
- Engine: [Wright R-1820 series](https://openairdocs.org/engine/wright-r-1820-series) (registry code 67020)
- Data sheets: [TCDS A33SO](https://openairdocs.org/tcds/A33SO) (Amphibian Aerospace Industries Defense, Inc., a Delaware corporation (Delaware file no. 10288788), c/o Dunlap Bennett & Ludwig, PLLC) (OpenAirDocs)
- Serial number: 141278
- Year built: 1955
- Type: Fixed wing multi engine
- Engine type: Reciprocating
- Airworthiness: Restricted, aerial surveying, carriage of cargo
- Airworthiness date: December 5, 1997
- Certificate issued: January 13, 2004
- Expires: January 31, 2030
- Mode S code: A1B2FF
- Registered owner: [Upper Limit LLC](https://openairdocs.org/faa-owner/UPPER%20LIMIT%20LLC)
- Location: [Big Lake, AK](https://openairdocs.org/faa-place/AK/Big%20Lake)
- Owner type: LLC
- Owner's area on the map: 61.5160° N, 149.9712° W: Placed by OpenAirDocs at the center of ZIP code 99652, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=20861
- Page: https://openairdocs.org/aircraft/N20861

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 Wright R-1820 model are included.

## ADs that may apply (OpenAirDocs): 2 in force

### Matched by airframe (Grumman HU-16D)

- [AD 2026-13-02](https://openairdocs.org/ad/2026-13-02): Navigation · Airbus Canada Limited Partnership 18, 49-46, 80-A and 555 more. Effective Jul 1, 2026
- [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023

### Matched by engine (Wright R-1820 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N20861.

## FAA accident and incident reports

None matched to N20861.

## 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) (1)

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 (Grumman HU-16D)

- [STC SA02511SE](https://openairdocs.org/stc/SA02511SE): Installation of replacement fuel quantity indicator sending unit(s). CiES Inc

## Related

- Other Grumman HU-16D aircraft: https://openairdocs.org/model/grumman-hu-16d/aircraft.md
- The Wright R-1820 series engine: https://openairdocs.org/engine/wright-r-1820-series.md

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