# N521S: 1985 SIAI Marchetti S-211

- Status: Valid registration
- Airframe: [SIAI Marchetti S-211](https://openairdocs.org/model/siai-marchetti-s-211) (registry code 8120416, 2 seats)
- Engine: [Pratt & Whitney Canada JT15D-4C](https://openairdocs.org/engine/pratt-whitney-canada-jt15d-4c) (registry code 52195)
- Data sheets: [TCDS E25EA](https://openairdocs.org/tcds/E25EA) (Pratt & Whitney Canada Corp.) (OpenAirDocs)
- Serial number: 032/02-021
- Year built: 1985
- Type: Fixed wing single engine
- Engine type: Turbo-fan
- Airworthiness: Experimental, exhibition
- Airworthiness date: May 5, 2026
- Certificate issued: February 18, 2025
- Expires: February 29, 2032
- Mode S code: A68E35
- Registered owner: [Aviation Performance Solutions LLC](https://openairdocs.org/faa-owner/AVIATION%20PERFORMANCE%20SOLUTIONS%20LLC)
- Location: [Mesa, AZ](https://openairdocs.org/faa-place/AZ/Mesa)
- Owner type: LLC
- Owner's area on the map: 33.3207° N, 111.6313° W: Placed by OpenAirDocs at the center of ZIP code 85212, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=521S
- Page: https://openairdocs.org/aircraft/N521S

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): 1 in force

### Matched by airframe (SIAI Marchetti S-211)

None in force.

### Matched by engine (Pratt & Whitney Canada JT15D-4C)

- [AD 93-18-08](https://openairdocs.org/ad/93-18-08): High Pressure Turbine (HPT) Assembly · Pratt & Whitney Canada JT15D-1, JT15D-1A, JT15D-1B and 4 more. Effective Nov 24, 1993

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N521S.

## NTSB investigations on N521S not matched to an aircraft (1)

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 NYC00LA259](https://openairdocs.org/ntsb/NYC00LA259), Sep 2, 2000: Mihlebach Waco (N521S), Williamstown, NJ, substantial damage. Probable cause: The pilot's failure to execute an adequate flare, which resulted in a hard landing.

## FAA accident and incident reports

None matched to N521S.

## Reports on N521S not matched to an aircraft (1)

They name N521S, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [Accident 20000902043469A](https://openairdocs.org/incident/20000902043469A), Sep 2, 2000: Amtr F2SPECIAL (N521S), Williamstown, NJ, Substantial damage. (-23) On landing runway 27 aircraft was flared and bounced once. Pilot added power to settle aircraft. Left axle failed (wheel separated from aircraft) and the…

## 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 N521S not matched to an aircraft (1)

They name N521S, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [SDR 20001227SH032](https://openairdocs.org/sdr/20001227SH032), Sep 2, 2000: AXLE. FAILED. ON LANDING, LEFT AXLE FAILED CAUSING AIRCRAFT STRUT TO DIG INTO GRASS FIELD. AIRCRAFT FLIPPED ON ITS BACK CAUSING SUBSTANTIAL DAMAGE. PRELIMINARY INSPECTION IND

## STCs that may be installed (OpenAirDocs)

None matched to this aircraft's models.

## Related

- Other SIAI Marchetti S-211 aircraft: https://openairdocs.org/model/siai-marchetti-s-211/aircraft.md
- The Pratt & Whitney Canada JT15D-4C engine: https://openairdocs.org/engine/pratt-whitney-canada-jt15d-4c.md

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