# N20900: Waco VKS-7

- Status: Valid registration
- Airframe: [Waco VKS-7](https://openairdocs.org/model/waco-vks-7) (registry code 9600826, 5 seats)
- Engine: [Continental R670-SERIES series](https://openairdocs.org/engine/continental-r670-series-series) (registry code 17016)
- Data sheets: [TCDS ATC 648](https://openairdocs.org/tcds/ATC%20648) (The Waco Aircraft Company) (OpenAirDocs)
- Serial number: 5218
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard
- Certificate issued: September 8, 2014
- Expires: September 30, 2027
- Mode S code: A1B5E3
- Registered owner: [Wenglarz Maxwell D](https://openairdocs.org/faa-owner/WENGLARZ%20MAXWELL%20D)
- Location: [San Pierre, IN](https://openairdocs.org/faa-place/IN/San%20Pierre)
- Owner type: Individual
- Owner's area on the map: 41.2054° N, 86.8995° W: Placed by OpenAirDocs at the center of ZIP code 46374, within about 3 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=20900
- Page: https://openairdocs.org/aircraft/N20900

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 Continental R670-SERIES model are included.

## ADs that may apply (OpenAirDocs): 2 in force

### Matched by airframe (Waco VKS-7)

- [AD 47-27-01](https://openairdocs.org/ad/47-27-01): Wing inspection (tank area) · Waco Aircraft Company, The UKS-7, VKS-7 (Army UC-72D) and VKS-7F

### Matched by engine (Continental R670-SERIES series)

- [AD 95-21-15](https://openairdocs.org/ad/95-21-15): Aviation Gasoline · Continental Motors A-65-8, C85-12F, C85-12FJ and 77 more. Effective Nov 28, 1995

### Historical (superseded or no longer in force)

- [AD 94-14-12](https://openairdocs.org/ad/94-14-12) (historical): Octane Aviation Gasoline · Teledyne Continental Motors A-65-8, C85-12, E185-11 and 68 more

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N20900.

## FAA accident and incident reports

None matched to N20900.

## 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) (7)

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 VKS-7)

- [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 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 (Continental R670-SERIES series)

- [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. Lists R-670-B
- [STC SA4005NM](https://openairdocs.org/stc/SA4005NM): Precise Flight Inc. Pulselite Control System. Precise Flight Inc. Lists R-670-B
- [STC SE5879SW](https://openairdocs.org/stc/SE5879SW): Use of Phillips X/C II 20W-50 and25W-60 oil (OSS 55875) in all Avco reciprocating aircraft engines from 65 to 450 BHP. Phillips Petroleum Co

## Related

- Other Waco VKS-7 aircraft: https://openairdocs.org/model/waco-vks-7/aircraft.md
- The Continental R670-SERIES series engine: https://openairdocs.org/engine/continental-r670-series-series.md

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