# N181LL: 1996 Shearer William Joseph AVID MARK IV

- Status: Valid registration
- Airframe: [Shearer William Joseph AVID MARK IV](https://openairdocs.org/model/shearer-william-joseph-avid-mark-iv) (registry code 05628QR, 2 seats)
- Engine: [Subaru ALL MDLS A/B](https://openairdocs.org/engine/subaru-all-mdls-a-b) (registry code 59050)
- Serial number: 1300B
- Year built: 1996
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Experimental, amateur built
- Airworthiness date: November 9, 1996
- Certificate issued: October 28, 1996
- Expires: July 31, 2028
- Mode S code: A14568
- Registered owner: [Shearer William J](https://openairdocs.org/faa-owner/SHEARER%20WILLIAM%20J)
- Location: [Vicksburg, MI](https://openairdocs.org/faa-place/MI/Vicksburg)
- Owner type: Individual
- Owner's area on the map: 42.1220° N, 85.4874° W: Placed by OpenAirDocs at the center of ZIP code 49097, within about 5 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=181LL
- Page: https://openairdocs.org/aircraft/N181LL

From the FAA registry file of October 22, 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 (Shearer William Joseph AVID MARK IV)

None in force.

### Matched by engine (Subaru ALL MDLS A/B)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N181LL.

## 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.

- [Incident 20050730021509I](https://openairdocs.org/incident/20050730021509I), Jul 30, 2005: Amtr AVIDMARKIV (N181LL), Oshkosh, WI, Minor damage. (-23) Pilot had aircraft on step taxi to takeoff area, right float started to dig in, aircraft slowly went over on its back.

## 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 N181LL

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N181LL before.

- [Cancelled 1991-04-09](https://openairdocs.org/deregistered/N181LL-1991-04-09): Beech B90, S/N LJ440. Triennial form not returned. Owner: [Critical Care Services Inc DBA](https://openairdocs.org/faa-owner/CRITICAL%20CARE%20SERVICES%20INC%20DBA), [St Paul, MN](https://openairdocs.org/faa-place/MN/St%20Paul)

## Related

- Other Shearer William Joseph AVID MARK IV aircraft: https://openairdocs.org/model/shearer-william-joseph-avid-mark-iv/aircraft.md
- The Subaru ALL MDLS A/B engine: https://openairdocs.org/engine/subaru-all-mdls-a-b.md

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