# N561M: 1929 Roos LINCOLN PT-W

- Status: Registration pending
- Airframe: [Roos LINCOLN PT-W](https://openairdocs.org/model/roos-lincoln-pt-w) (registry code 7680312, 2 seats)
- Engine: [Warner SCARAB series](https://openairdocs.org/engine/warner-scarab-series) (registry code 64502)
- Data sheets: [TCDS ATC 284](https://openairdocs.org/tcds/ATC%20284) (Roos Aircraft Company Victor H.) (OpenAirDocs)
- Serial number: 801
- Year built: 1929
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Mode S code: A72BB4
- Location: [Oklahoma City, OK](https://openairdocs.org/faa-place/OK/Oklahoma%20City)
- Owner type: Individual
- Owner's area on the map: 35.4890° N, 97.5190° W: Placed by OpenAirDocs at the center of ZIP code 73103, within about a mile (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=561M
- Page: https://openairdocs.org/aircraft/N561M

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 Warner SCARAB model are included.

## ADs that may apply (OpenAirDocs): 1 in force

### Matched by airframe (Roos LINCOLN PT-W)

None in force.

### Matched by engine (Warner SCARAB series)

- [AD 51-04-02](https://openairdocs.org/ad/51-04-02): Cylinder Holddown Studs · Warner Engine Scarab Jr. Series 40, Scarab Jr. Series 50, Scarab Series 28 and 13 more

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N561M.

## FAA accident and incident reports

None matched to N561M.

## 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) (8)

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 (Roos LINCOLN PT-W)

- [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC
- [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 SE49WE](https://openairdocs.org/stc/SE49WE): Modification of the supercharger inlet housing and connecting elbow assembly of Avco Lycoming IGSO-480-A1E6. Gibbs Flying Service Inc

### Approved for the engine (Warner SCARAB series)

- [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. Lists Scarab Jr. Series 40
- [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc. Lists Scarab Jr. Series 40
- [STC SE2591 CE](https://openairdocs.org/stc/SE2591%20CE): Add unleaded automotive gasoline, 87 minimum antiknock index and leaded automotive gasoline, 88 minimum antiknock index(RON + MON)/2, per ASTM Specification D-439. Petersen Aviation Inc. Lists Scarab Series 28
- [STC SE2591CE](https://openairdocs.org/stc/SE2591CE): Add unleaded automotive gasoline, 87 minimum antiknock index and leaded automotive gasoline, 88 minimum antiknock index(RON + MON)/2, per ASTM Specification D-439. Petersen Aviation Inc. Lists Scarab Series 28
- [STC SE4601SW](https://openairdocs.org/stc/SE4601SW): Modify intake and exhaust valves. Daily Tubbs Aero, Inc. Lists Scarab Series 40

## Related

- Other Roos LINCOLN PT-W aircraft: https://openairdocs.org/model/roos-lincoln-pt-w/aircraft.md
- The Warner SCARAB series engine: https://openairdocs.org/engine/warner-scarab-series.md

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