# N13074: 1933 Waco UBF - Status: Valid registration - Airframe: [Waco UBF](https://openairdocs.org/model/waco-ubf) (registry code 9600404, 3 seats) - Engine: [Continental R670-SERIES series](https://openairdocs.org/engine/continental-r670-series-series) (registry code 17016) - Data sheets: [TCDS ATC 473](https://openairdocs.org/tcds/ATC%20473) (The Waco Aircraft Company) (OpenAirDocs) - Serial number: 3691 - Year built: 1933 - Type: Fixed wing single engine - Engine type: Reciprocating - Airworthiness: Standard, normal - Airworthiness date: August 11, 1964 - Certificate issued: May 1, 2025 - Expires: May 31, 2032 - Mode S code: A07E9B - Registered owner: [Borgerson Mark J](https://openairdocs.org/faa-owner/BORGERSON%20MARK%20J) - Location: [Montevideo, MN](https://openairdocs.org/faa-place/MN/Montevideo) - Owner type: Individual - Owner's area on the map: 44.9998° N, 95.7065° W: Placed by OpenAirDocs at the center of ZIP code 56265, within about 9 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=13074 - Page: https://openairdocs.org/aircraft/N13074 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): 1 in force ### Matched by airframe (Waco UBF) None in force. ### 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 Effective Nov 28, 1995 ### Historical (superseded or no longer in force) - [AD 94-14-12](https://openairdocs.org/ad/94-14-12) (historical): Octane Aviation Gasoline · Teledyne Continental Motors A-65-8, C85-12, E185-11 and 68 more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 N13074. ## FAA accident and incident reports (1) From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [Incident 20230421004689I](https://openairdocs.org/incident/20230421004689I), Apr 21, 2023: Waco UBF (N13074), Los Angeles, CA, Minor damage. The pilot stated that he was taxing the aircraft and weaving back and forth for visibility. He then applied the brakes to move back to the left for clearence… ## 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) (13) 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 UBF) - [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 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 SA8075SW](https://openairdocs.org/stc/SA8075SW): Installation of fiberglass covering. (M-62 SERIES PT-19) (G-73 SCHWEIZER). Razorback Fabrics Inc - [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 SA628WE](https://openairdocs.org/stc/SA628WE): Ceconite 101 covering of entire airframe. Cooper Engineering Corporation - [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 ### 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 UBF aircraft: https://openairdocs.org/model/waco-ubf/aircraft.md - The Continental R670-SERIES series engine: https://openairdocs.org/engine/continental-r670-series-series.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.