# N656N: 1930 Waco CSO

- Status: Valid registration
- Airframe: [Waco CSO](https://openairdocs.org/model/waco-cso) (registry code 9601206, 3 seats)
- Engine: [Wright 760A B D E&ET](https://openairdocs.org/engine/wright-760a-b-d-e-et) (registry code 67009)
- Data sheets: [TCDS ATC 240](https://openairdocs.org/tcds/ATC%20240) (The Waco Aircraft Company) (OpenAirDocs)
- Serial number: 3136
- Year built: 1930
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard, normal
- Airworthiness date: August 6, 1964
- Certificate issued: March 23, 2018
- Expires: March 31, 2028
- Mode S code: A8A430
- Registered owner: [Niemyjski Justin](https://openairdocs.org/faa-owner/NIEMYJSKI%20JUSTIN)
- Location: [Franksville, WI](https://openairdocs.org/faa-place/WI/Franksville)
- Owner type: Individual
- Owner's area on the map: 42.7945° N, 87.9977° W: Placed by OpenAirDocs at the center of ZIP code 53126, 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=656N
- Page: https://openairdocs.org/aircraft/N656N

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 CSO)

None in force.

### Matched by engine (Wright 760A B D E&ET)

None in force.

## Information bulletins (advisory)

None matched.

## NTSB investigations (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 UNK65X0283](https://openairdocs.org/ntsb/UNK65X0283), Oct 15, 1964: Waco CSO (N656N), Beaver Lake, NY, substantial damage

## FAA accident and incident reports

None matched to N656N.

## 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) (10)

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 CSO)

- [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC
- [STC SA4503NM](https://openairdocs.org/stc/SA4503NM): Remove original cloth covering and install Ceconite covering. Ceconite Division of Poly-Fiber 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 SA00478CH](https://openairdocs.org/stc/SA00478CH): Installation of Cooper Superflite 102 Fabric. Aviation Products Systems Inc
- [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories. Electronics International Inc
- [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
- [STC SA2687NM](https://openairdocs.org/stc/SA2687NM): Installation of Truboplus/ Electronics Int'l gauges and switches. Aero Manufacturing Inc
- [STC SA2350NM PAGE 2](https://openairdocs.org/stc/SA2350NM%20PAGE%202): Installation of Electronics International Inc digital carburetor/outside air temperature gauges. Electronics International
- [STC SA2190NM PAGE 2](https://openairdocs.org/stc/SA2190NM%20PAGE%202): Installation of electronics International Digital Volt/Amp Gauges and Accessories. Electronics International
- [STC SA2350NM](https://openairdocs.org/stc/SA2350NM) (historical): Installation of Electronics International Inc digital carburetor/outside air temperature gauges listed on the attached continuation sheet and the associated accessories. Electronics International

## Related

- Other Waco CSO aircraft: https://openairdocs.org/model/waco-cso/aircraft.md
- The Wright 760A B D E&ET engine: https://openairdocs.org/engine/wright-760a-b-d-e-et.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.