# N577WN: 2021 W Michael Nicholls SLING 4TSI

- Status: Valid registration
- Airframe: [W Michael Nicholls SLING 4TSI](https://openairdocs.org/model/w-michael-nicholls-sling-4tsi) (registry code 05640BL, 4 seats)
- Engine: [Rotax 915 IS series](https://openairdocs.org/engine/rotax-915-is-series) (registry code 55620)
- Data sheets: [TCDS E00051EN](https://openairdocs.org/tcds/E00051EN) (BRP-Rotax GmbH & Co KG) (OpenAirDocs)
- Serial number: 188SK
- Year built: 2021
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Kit: Airplane Factory SLING 4 TSI
- Airworthiness: Experimental, amateur built
- Airworthiness date: September 29, 2021
- Certificate issued: June 8, 2021
- Expires: June 30, 2028
- Mode S code: A76A6B
- Registered owner: [Nicholls W Michael Trustee](https://openairdocs.org/faa-owner/NICHOLLS%20W%20MICHAEL%20TRUSTEE)
- Location: [Bend, OR](https://openairdocs.org/faa-place/OR/Bend)
- Owner type: Individual
- Owner's area on the map: 43.9828° N, 121.2097° W: Placed by OpenAirDocs at the center of ZIP code 97702, within about 6 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=577WN
- Page: https://openairdocs.org/aircraft/N577WN

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. The registry lists only the engine series, so ADs for every Rotax 915 IS model are included.

## ADs that may apply (OpenAirDocs): 2 in force

### Matched by airframe (W Michael Nicholls SLING 4TSI)

None in force.

### Matched by engine (Rotax 915 IS series)

- [AD 2026-04-02](https://openairdocs.org/ad/2026-04-02): Turbine Engine Reduction Gear · BRP-Rotax 915 iSc2 C24 and 915 iSc3 C24. Effective Mar 19, 2026
- [AD 2025-15-03](https://openairdocs.org/ad/2025-15-03): Reciprocating Engine Oil System · BRP-Rotax 912 iSc2 Sport, 912 iSc3 Sport, 915 iSc2 C24 and 1 more. Effective Aug 6, 2025

### Historical (superseded or no longer in force)

- [AD 2025-07-02](https://openairdocs.org/ad/2025-07-02) (historical): Reciprocating Engine Oil System · BRP-Rotax 912 iSc2 Sport, 912 iSc3 Sport, 915 iSc2 C24 and 1 more. Effective Apr 21, 2025

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N577WN.

## FAA accident and incident reports

None matched to N577WN.

## 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.

## Service difficulty reports on N577WN not matched to an aircraft (1)

They name N577WN, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [SDR SWAA2022020163797](https://openairdocs.org/sdr/SWAA2022020163797), Sep 15, 2017: PLATE. CORRODED. ***CORROSION*** LH AFT CARGO FLOOR TO SIDEWALL SUPPORT PLATE CLIP HAS CORROSION AT STA 727+5 BOTTOM SIDE / REMOVED DAMAGED L/H ACB FLOOR TO SIDEWALL SUPPORT PLA

## 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 (Rotax 915 IS series)

- [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 915 iSc2 C24

## Related

- Other W Michael Nicholls SLING 4TSI aircraft: https://openairdocs.org/model/w-michael-nicholls-sling-4tsi/aircraft.md
- The Rotax 915 IS series engine: https://openairdocs.org/engine/rotax-915-is-series.md

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