# N685N: Waco KNF

- Status: Valid registration
- Airframe: [Waco KNF](https://openairdocs.org/model/waco-knf) (registry code 9600418, 3 seats)
- Data sheets: [TCDS ATC 313](https://openairdocs.org/tcds/ATC%20313) (The Waco Aircraft Company) (OpenAirDocs)
- Serial number: 3239
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Certificate issued: December 8, 2010
- Expires: December 31, 2029
- Mode S code: A916F6
- Registered owners: [Agaliotis Paul E](https://openairdocs.org/faa-owner/AGALIOTIS%20PAUL%20E), [Agaliotis Judity L](https://openairdocs.org/faa-owner/AGALIOTIS%20JUDITY%20L), [Haley Sam C](https://openairdocs.org/faa-owner/HALEY%20SAM%20C)
- Location: [San Martin, CA](https://openairdocs.org/faa-place/CA/San%20Martin)
- Owner type: Co-owned
- Owner's area on the map: 37.0993° N, 121.5992° W: Placed by OpenAirDocs at the center of ZIP code 95046, 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=685N
- Page: https://openairdocs.org/aircraft/N685N

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): 1 in force

### Matched by airframe (Waco KNF)

- [AD 46-50-01](https://openairdocs.org/ad/46-50-01): Fuel line rework · Waco Aircraft Company, The INF, KNF and RNF

## Information bulletins (advisory)

None matched.

## NTSB investigations

None matched to N685N.

## FAA accident and incident reports

None matched to N685N.

## 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) (9)

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 KNF)

- [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC
- [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 SA1626NM PAGE 2](https://openairdocs.org/stc/SA1626NM%20PAGE%202): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series). Electronics International
- [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 SA4302NM](https://openairdocs.org/stc/SA4302NM): Installation of Electronics Int'l digital automatic engine analyzer. 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

## Earlier aircraft with N685N

The FAA can reassign an N-number once a registration is cancelled. These aircraft carried N685N before.

- [Cancelled 1948-02-16](https://openairdocs.org/deregistered/N685N-1948-02-16): Waco RNF, S/N 3237. Owner: [University Of Georgia School Of Aviation Inc.](https://openairdocs.org/faa-owner/UNIVERSITY%20OF%20GEORGIA%20SCHOOL%20OF%20AVIATION%20INC.), [Athens, GA](https://openairdocs.org/faa-place/GA/Athens)

## Related

- Other Waco KNF aircraft: https://openairdocs.org/model/waco-knf/aircraft.md

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