# N66720: 1940 Waco UPF-7 - Status: Valid registration - Airframe: [Waco UPF-7](https://openairdocs.org/model/waco-upf-7) (registry code 9601302, 2 seats) - Engine: [Lycoming R680E series](https://openairdocs.org/engine/lycoming-r680e-series) (registry code 41545) - Data sheets: [TCDS A-642](https://openairdocs.org/tcds/A-642) (The Waco Aircraft Company), [TCDS E-202](https://openairdocs.org/tcds/E-202) (Textron Lycoming AVCO Corporation) (OpenAirDocs) - Serial number: 5588 - Year built: 1940 - Type: Fixed wing single engine - Engine type: Reciprocating - Airworthiness: Restricted, agriculture and pest control - Airworthiness date: May 7, 1958 - Certificate issued: April 29, 2025 - Expires: April 30, 2032 - Mode S code: A8D0F1 - Registered owner: [Erickson Kirk E](https://openairdocs.org/faa-owner/ERICKSON%20KIRK%20E) - Location: [Warroad, MN](https://openairdocs.org/faa-place/MN/Warroad) - Owner type: Individual - Owner's area on the map: 48.8073° N, 95.3414° W: Placed by OpenAirDocs at the center of ZIP code 56763, 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=66720 - Page: https://openairdocs.org/aircraft/N66720 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 Lycoming R680E model are included. ## ADs that may apply (OpenAirDocs): 5 in force ### Matched by airframe (Waco UPF-7) None in force. ### Matched by engine (Lycoming R680E series) - [AD 2012-03-07](https://openairdocs.org/ad/2012-03-07): Carburetor · Lycoming Engines GO-435, GO-435-C2 (O-435-17), GO-435-C2A and 389 more. Effective Mar 27, 2012 - [AD 2004-10-14](https://openairdocs.org/ad/2004-10-14): Crankshaft gear · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 642 more. Effective Jun 25, 2004 - [AD 95-26-02](https://openairdocs.org/ad/95-26-02): Aviation Gasoline · Lycoming Engines IO-320-B1A, IO-320-B1B, IO-320-B1C and 182 more. Effective Jan 24, 1996 - [AD 90-04-06 R1](https://openairdocs.org/ad/90-04-06-R1): Propeller Governor External Oil Line · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 427 more. Effective May 28, 1991 - [AD 66-06-03](https://openairdocs.org/ad/66-06-03): Connecting Rod Assemblies · Lycoming Engines GO-435-C2 (O-435-17), GO-435-C2A, GO-435-C2A2 and 317 more. Effective Jan 16, 1969 ## Information bulletins (advisory) None matched. ## NTSB investigations None matched to N66720. ## FAA accident and incident reports None matched to N66720. ## 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) (35) 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 UPF-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 SA00079NY](https://openairdocs.org/stc/SA00079NY): Installation of Airwolf remote mounted engine oil filter kit AFC-K008 on single and multi engine fixed wing light aircraft incorporating Teledyne Continental reciprocating engines of 450 horsepower or less. Airwolf Filter Corporation - [STC SA7965SW](https://openairdocs.org/stc/SA7965SW): Application of fabric and polyurethane finishing system. Shady Aviation LLC - [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. 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 SA01967WI](https://openairdocs.org/stc/SA01967WI): Use of GAMI G100UL High Octane Unleaded Avgas. General Aviation Modifications Inc - [STC SA04776NY](https://openairdocs.org/stc/SA04776NY): The HIPEC Covering and Finishing System must be performed and maintained. HIPEC Aircraft Coatings Inc - [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc - [STC SA02268CH](https://openairdocs.org/stc/SA02268CH): Installation of Airwolf Filter Corp. Air Oil Separator. Airwolf Filter Corporation - [STC SA02498CH](https://openairdocs.org/stc/SA02498CH): Installation of Cleveland Wheel and barke Kit 199-64 (including 30-28D brake assembly and 40-40B wheel assembly). Rare Aircraft Ltd - [STC SA2586NM](https://openairdocs.org/stc/SA2586NM): Installation of J.P. Instruments temperature monitoring systems. J P Instruments - [STC SA01807NY](https://openairdocs.org/stc/SA01807NY): Increase the maximum certified weight to 2880 lbs. Rare Aircraft Ltd - [STC SA02428SE](https://openairdocs.org/stc/SA02428SE): Installation of an Air Stream Switch for an electric time recording device on non-pressurized aircraft. Henry F Rogers/David E Polley - [STC SA00478CH](https://openairdocs.org/stc/SA00478CH): Installation of Cooper Superflite 102 Fabric. Aviation Products Systems Inc - [STC SA01669CH](https://openairdocs.org/stc/SA01669CH): Installation of Challenger Reusable Air Filter. Challenger Aviation Products Inc - [STC SA00556SE](https://openairdocs.org/stc/SA00556SE): Replacement of airplane fuselage frame structure with The WACO Aircraft Co. Inc. fuselage. Rare Aircraft Ltd - [STC SA00432SE](https://openairdocs.org/stc/SA00432SE): Installation of EGT 701 series fuel flow instrument. J P Instruments - [STC SA00861SE](https://openairdocs.org/stc/SA00861SE): Installation of J.P. Instruments (JPI) fuel flow indicating system. J P Instruments - [STC SA02237SE](https://openairdocs.org/stc/SA02237SE): Installation of Cleveland Wheel 40-40B and Brake 30-28D (Kit No. 199-64). Kevin Kreiter - [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 SA1008WE](https://openairdocs.org/stc/SA1008WE): Installation of Poly-Fiber covering material. Poly-Fiber Inc - [STC SA00068LA](https://openairdocs.org/stc/SA00068LA): Installation of tail wheel adapter ring. R-R-R-Russ Aircraft - [STC SA00373LA](https://openairdocs.org/stc/SA00373LA): Installation of engines, modified with addition of a Jacobs shielded ignition harness. Aero Engines Inc - [STC SA2081CE](https://openairdocs.org/stc/SA2081CE): Operation of airplane on unleaded automotive gasoline, 87 minimum antiknock index and leaded automotive gasoline, 88 minimum antiknock index (RON+MON)/2. Intermixing with aviation gasoline also approved. Petersen Aviation Inc - [STC SA1351WE](https://openairdocs.org/stc/SA1351WE): Replace existing fabric on wings, fuselage, empennage, and/or control surfaces, with Ceconite101 material. (262A Series -12). Ceconite Inc - [STC SA4-1210](https://openairdocs.org/stc/SA4-1210): Installation of Eonnex cover on aircraft surfaces. Ceconite, Inc - [STC SA471NW](https://openairdocs.org/stc/SA471NW): Installation of a metalized fuselage covering. Stark, Robert C - [STC SA4-1567](https://openairdocs.org/stc/SA4-1567): Ceconite 101 covering of complete aircraft. Cooper Engineering Corporation ### Approved for the engine (Lycoming R680E 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-680-E1 - [STC SE01966WI](https://openairdocs.org/stc/SE01966WI): Use of GAMI G100UL High Octane Unleaded Avgas in spark ignition piston aircraft engines. General Aviation Modifications Inc. Lists R-680-E1 - [STC SE2407CE](https://openairdocs.org/stc/SE2407CE): Add the following approved fuel: unleaded automotive gas, 91 minimum antiknock index and leaded automotive gas, 91 minimum antiknock index, (RON+MON)/2. Petersen Aviation Inc. Lists R-680E3 - [STC SE2408CE](https://openairdocs.org/stc/SE2408CE): Add the following approved fuel: unleaded automotive gas, 91 minimum antiknock index and leaded automotive gas, 91 minimum antiknock index, (RON+MON)/2. Petersen Aviation Inc. Lists R-680E1 - [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. Lists R-680 Series - [STC SE128NE](https://openairdocs.org/stc/SE128NE): Use of AMS/OIL 15W 50 synthetic piston aircraft oil in Avco engines. AMS/OIL. Lists R-680 Series ## Related - Other Waco UPF-7 aircraft: https://openairdocs.org/model/waco-upf-7/aircraft.md - The Lycoming R680E series engine: https://openairdocs.org/engine/lycoming-r680e-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.