# N81172: 1943 Boeing N2S-5

- Status: Valid registration
- Airframe: [Boeing N2S-5](https://openairdocs.org/model/boeing-n2s-5) (registry code 1380124, 2 seats)
- Engine: [Lycoming R680](https://openairdocs.org/engine/lycoming-r680) (registry code 41540)
- Data sheets: [TCDS ATC 42 Textron Lycoming](https://openairdocs.org/tcds/ATC%2042%20Textron%20Lycoming) (Textron Lycoming AVCO Corporation) (OpenAirDocs)
- Serial number: 75-8088
- Year built: 1943
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard, normal, acrobatic
- Airworthiness date: December 12, 1996
- Certificate issued: December 7, 2023
- Expires: December 31, 2030
- Mode S code: AB107B
- Registered owner: [Qualitair LLC Trustee](https://openairdocs.org/faa-owner/QUALITAIR%20LLC%20TRUSTEE)
- Location: Michelstadt, Germany
- Owner type: LLC
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=81172
- Page: https://openairdocs.org/aircraft/N81172

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): 5 in force

### Matched by airframe (Boeing N2S-5)

None in force.

### Matched by engine (Lycoming R680)

- [AD 2012-03-07](https://openairdocs.org/ad/2012-03-07): Carburetor · Lycoming Engines GO-435, GO-435-C2 (O-435-17), GO-435-C2A and 389 more. Effective Mar 27, 2012
- [AD 2004-10-14](https://openairdocs.org/ad/2004-10-14): Crankshaft gear · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 642 more. Effective Jun 25, 2004
- [AD 95-26-02](https://openairdocs.org/ad/95-26-02): Aviation Gasoline · Lycoming Engines IO-320-B1A, IO-320-B1B, IO-320-B1C and 182 more. Effective Jan 24, 1996
- [AD 90-04-06 R1](https://openairdocs.org/ad/90-04-06-R1): Propeller Governor External Oil Line · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 427 more. Effective May 28, 1991
- [AD 66-06-03](https://openairdocs.org/ad/66-06-03): Connecting Rod Assemblies · Lycoming Engines GO-435-C2 (O-435-17), GO-435-C2A, GO-435-C2A2 and 317 more. Effective Jan 16, 1969

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N81172.

## FAA accident and incident reports

None matched to N81172.

## 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 engine (Lycoming R680)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC

## Related

- Other Boeing N2S-5 aircraft: https://openairdocs.org/model/boeing-n2s-5/aircraft.md
- The Lycoming R680 engine: https://openairdocs.org/engine/lycoming-r680.md

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