# N400AK: 2011 Yippie Ki-Yay MACKEY SQ2

- Status: Valid registration
- Airframe: [Yippie Ki-Yay MACKEY SQ2](https://openairdocs.org/model/yippie-ki-yay-mackey-sq2) (registry code 05631JO, 2 seats)
- Engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999)
- Serial number: TCQ-1012078
- Year built: 2011
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Kit: Backcountry Super Cubs LLC SQ2
- Airworthiness: Experimental, amateur built
- Airworthiness date: February 16, 2012
- Certificate issued: August 27, 2022
- Expires: August 31, 2029
- Mode S code: A4ACAB
- Registered owner: [Veridian Dynamics LLC](https://openairdocs.org/faa-owner/VERIDIAN%20DYNAMICS%20LLC)
- Location: [Fairbanks, AK](https://openairdocs.org/faa-place/AK/Fairbanks)
- Owner type: LLC
- Owner's area on the map: 64.8774° N, 148.1486° W: Placed by OpenAirDocs at the center of ZIP code 99709, within about 13 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=400AK
- Page: https://openairdocs.org/aircraft/N400AK

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 (Yippie Ki-Yay MACKEY SQ2)

None in force.

### Matched by engine (Amateur-built UNKNOWN ENG)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N400AK.

## FAA accident and incident reports

None matched to N400AK.

## 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 N400AK

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N400AK before.

- [Cancelled 2005-07-12](https://openairdocs.org/deregistered/N400AK-2005-07-12): Gates Learjet 35A, S/N 520, built 1984. Sale reported. Owner: [Wright/Pat Afb, OH](https://openairdocs.org/faa-place/OH/Wright%2FPat%20Afb)

## Related

- Other Yippie Ki-Yay MACKEY SQ2 aircraft: https://openairdocs.org/model/yippie-ki-yay-mackey-sq2/aircraft.md
- The Amateur-built UNKNOWN ENG engine: https://openairdocs.org/engine/amateur-built-unknown-eng.md

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