# N1783S: 2021 Best Aviation Services PHY37

- Status: Valid registration
- Airframe: [Best Aviation Services PHY37](https://openairdocs.org/model/best-aviation-services-phy37) (registry code 056394B, 1 seats)
- Engine: [NONE](https://openairdocs.org/engine/none) (registry code 00000)
- Serial number: H006
- Year built: 2021
- Type: Balloon
- Engine type: None
- Airworthiness: Experimental, exhibition
- Airworthiness date: June 8, 2021
- Certificate issued: April 15, 2021
- Expires: April 30, 2028
- Mode S code: A139B7
- Registered owner: [Stefan Karl](https://openairdocs.org/faa-owner/STEFAN%20KARL)
- Location: [Austin, TX](https://openairdocs.org/faa-place/TX/Austin)
- Owner type: Individual
- Owner's area on the map: 30.4572° N, 97.7564° W: Placed by OpenAirDocs at the center of ZIP code 78729, 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=1783S
- Page: https://openairdocs.org/aircraft/N1783S

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 (Best Aviation Services PHY37)

None in force.

### Matched by engine (NONE)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N1783S.

## FAA accident and incident reports

None matched to N1783S.

## 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 N1783S

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N1783S before.

- [Cancelled 2012-08-13](https://openairdocs.org/deregistered/N1783S-2012-08-13): Aero Commander 600 S-2D RESTRICTED, S/N 600-1408D, built 1967. Registration expired, pending cancellation. Owner: [Ag-Rotors Inc](https://openairdocs.org/faa-owner/AG-ROTORS%20INC), [Hollister, CA](https://openairdocs.org/faa-place/CA/Hollister)

## Related

- Other Best Aviation Services PHY37 aircraft: https://openairdocs.org/model/best-aviation-services-phy37/aircraft.md
- The NONE engine: https://openairdocs.org/engine/none.md

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.