# N18642: 1933 Monocoupe 110

- Status: Valid registration
- Airframe: [Monocoupe 110](https://openairdocs.org/model/monocoupe-110) (registry code 5810202, 2 seats)
- Engine: [Warner SCARAB series](https://openairdocs.org/engine/warner-scarab-series) (registry code 64502)
- Serial number: 6W53
- Year built: 1933
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard
- Certificate issued: March 18, 2014
- Expires: March 31, 2027
- Mode S code: A159F5
- Registered owner: [Historic Aircraft Restoration Museum](https://openairdocs.org/faa-owner/HISTORIC%20AIRCRAFT%20RESTORATION%20MUSEUM)
- Location: [Saint Louis, MO](https://openairdocs.org/faa-place/MO/Saint%20Louis)
- Owner type: Corporation
- Owner's area on the map: 38.7010° N, 90.4803° W: Placed by OpenAirDocs at the center of ZIP code 63146, 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=18642
- Page: https://openairdocs.org/aircraft/N18642

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 (Monocoupe 110)

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 (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB LAX07CA097](https://openairdocs.org/ntsb/LAX07CA097), Mar 1, 2007: Monocoupe 110 (N18642), Camarillo, CA, substantial damage. Probable cause: The pilot's failure to maintain directional control during the landing rollout that resulted in a ground loop.
- [NTSB SEA70D0109](https://openairdocs.org/ntsb/SEA70D0109), Oct 19, 1969: Monocoupe 110 (N18642), Monroe, WA, substantial damage

## FAA accident and incident reports (1)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20070301002589A](https://openairdocs.org/incident/20070301002589A), Mar 1, 2007: Mncoup 110 (N18642), Camarillo, CA, Substantial damage. (-23) On March 1, 2007, at 1128 pacific standard time, a monocoupe 110 flipped over on its back while on roll out from a landing on runway 26 at Camarillo…

## 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 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 Monocoupe 110 aircraft: https://openairdocs.org/model/monocoupe-110/aircraft.md
- The Warner SCARAB series engine: https://openairdocs.org/engine/warner-scarab-series.md

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