# N16590: 1936 Waco ZQC-6

- Status: Valid registration
- Airframe: [Waco ZQC-6](https://openairdocs.org/model/waco-zqc-6) (registry code 9600648, 5 seats)
- Engine: [Jacobs L5](https://openairdocs.org/engine/jacobs-l5) (registry code 35004)
- Data sheets: [TCDS TC 598](https://openairdocs.org/tcds/TC%20598) (The Waco Aircraft Company), [TCDS TC 156](https://openairdocs.org/tcds/TC%20156) (Air Repair Inc.) (OpenAirDocs)
- Serial number: 4494
- Year built: 1936
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard
- Airworthiness date: January 4, 1960
- Certificate issued: June 11, 2022
- Expires: June 30, 2029
- Mode S code: A107ED
- Registered owner: [Lowry Wilson](https://openairdocs.org/faa-owner/LOWRY%20WILSON)
- Location: [Leonardtown, MD](https://openairdocs.org/faa-place/MD/Leonardtown)
- Owner type: Individual
- Owner's area on the map: 38.2599° N, 76.6324° W: Placed by OpenAirDocs at the center of ZIP code 20650, within about 4 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=16590
- Page: https://openairdocs.org/aircraft/N16590

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 (Waco ZQC-6)

None in force.

### Matched by engine (Jacobs L5)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N16590.

## FAA accident and incident reports

None matched to N16590.

## 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) (6)

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 (Waco ZQC-6)

- [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC
- [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. Swift Fuels LLC
- [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc
- [STC SA01406NY](https://openairdocs.org/stc/SA01406NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K017 on single and multi-engine fixed light aircraft and rotary wing. Airwolf Filter Corporation
- [STC SA02033AT](https://openairdocs.org/stc/SA02033AT): Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line. M-20 Oil Separators LLC

### Approved for the engine (Jacobs L5)

- [STC SE04651CH](https://openairdocs.org/stc/SE04651CH): To allow use of l00R grade aviation fuel meeting Swift Fuel, LLC specification SPEC-l00R-22. Swift Fuels LLC

## Related

- Other Waco ZQC-6 aircraft: https://openairdocs.org/model/waco-zqc-6/aircraft.md
- The Jacobs L5 engine: https://openairdocs.org/engine/jacobs-l5.md

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