# N18921: Ryan Aeronautical ST-A SPECIAL

- Status: Valid registration
- Airframe: [Ryan Aeronautical ST-A SPECIAL](https://openairdocs.org/model/ryan-aeronautical-st-a-special) (registry code 7830404, 2 seats)
- Engine: [Menasco SUP PIRT D4B](https://openairdocs.org/engine/menasco-sup-pirt-d4b) (registry code 43506)
- Data sheets: [TCDS ATC 681](https://openairdocs.org/tcds/ATC%20681) (Ryan Aeronautical Company) (OpenAirDocs)
- Serial number: 339
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard
- Airworthiness date: May 4, 1956
- Certificate issued: October 4, 2024
- Expires: October 31, 2031
- Mode S code: A164D3
- Registered owner: [Sorenson Fred](https://openairdocs.org/faa-owner/SORENSON%20FRED)
- Location: [Las Vegas, NV](https://openairdocs.org/faa-place/NV/Las%20Vegas)
- Owner type: Individual
- Owner's area on the map: 36.1968° N, 115.2644° W: Placed by OpenAirDocs at the center of ZIP code 89128, 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=18921
- Page: https://openairdocs.org/aircraft/N18921

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): 0 in force

### Matched by airframe (Ryan Aeronautical ST-A SPECIAL)

None in force.

### Matched by engine (Menasco SUP PIRT D4B)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N18921.

## FAA accident and incident reports

None matched to N18921.

## 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) (3)

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 (Ryan Aeronautical ST-A SPECIAL)

- [STC SA00680SE](https://openairdocs.org/stc/SA00680SE): Installation of Electronics International model UBG-16 or UBG-16T bar graph engine analyzer. Electronics International
- [STC SA1626NM PAGE 2](https://openairdocs.org/stc/SA1626NM%20PAGE%202): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series). Electronics International
- [STC SA4302NM](https://openairdocs.org/stc/SA4302NM): Installation of Electronics Int'l digital automatic engine analyzer. Electronics International

## Related

- Other Ryan Aeronautical ST-A SPECIAL aircraft: https://openairdocs.org/model/ryan-aeronautical-st-a-special/aircraft.md
- The Menasco SUP PIRT D4B engine: https://openairdocs.org/engine/menasco-sup-pirt-d4b.md

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