# N139ST: 1999 Heizer J/Quicksilver SPRINT II

- Status: Valid registration
- Airframe: [Heizer J/Quicksilver SPRINT II](https://openairdocs.org/model/heizer-j-quicksilver-sprint-ii) (registry code 05904QJ, 2 seats)
- Engine: [Rotax 503 series](https://openairdocs.org/engine/rotax-503-series) (registry code 55564)
- Serial number: 099
- Year built: 1999
- Type: Fixed wing single engine
- Engine type: 2 cycle
- Airworthiness: Experimental, registered before 01/31/08
- Airworthiness date: January 29, 2008
- Certificate issued: January 16, 2008
- Expires: November 30, 2029
- Mode S code: A09E42
- Registered owner: [Heizer John Jr](https://openairdocs.org/faa-owner/HEIZER%20JOHN%20JR)
- Location: [Lovelock, NV](https://openairdocs.org/faa-place/NV/Lovelock)
- Owner type: Individual
- Owner's area on the map: 40.3429° N, 118.2877° W: Placed by OpenAirDocs at the center of ZIP code 89419, within about 11 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=139ST
- Page: https://openairdocs.org/aircraft/N139ST

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. The registry lists only the engine series, so ADs for every Rotax 503 model are included.

## ADs that may apply (OpenAirDocs): 0 in force

### Matched by airframe (Heizer J/Quicksilver SPRINT II)

None in force.

### Matched by engine (Rotax 503 series)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N139ST.

## FAA accident and incident reports

None matched to N139ST.

## Reports on N139ST not matched to an aircraft (1)

They name N139ST, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft.

- [Incident 20021025031399I](https://openairdocs.org/incident/20021025031399I), Oct 25, 2002: Lear 55C (N139ST), Omaha, NE. (-23) On October 25, 2002, approximately 1030 CDT, Lear 55C, N139ST, departed Eppley Airfield, Omaha, NE, under east coast jets charter flight ECJ39 wih an…

## 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.

## Related

- Other Heizer J/Quicksilver SPRINT II aircraft: https://openairdocs.org/model/heizer-j-quicksilver-sprint-ii/aircraft.md
- The Rotax 503 series engine: https://openairdocs.org/engine/rotax-503-series.md

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