# N397TH: 1995 Hegy Thomas R H-4000 - Status: Valid registration - Airframe: [Hegy Thomas R H-4000](https://openairdocs.org/model/hegy-thomas-r-h-4000) (registry code 05626NL, 3 seats) - Engine: [Continental W670 series](https://openairdocs.org/engine/continental-w670-series) (registry code 17018) - Serial number: 1318 - Year built: 1995 - Type: Fixed wing single engine - Engine type: Reciprocating - Airworthiness: Experimental, amateur built - Airworthiness date: October 27, 1995 - Certificate issued: January 28, 1995 - Expires: May 31, 2029 - Mode S code: A49E7B - Registered owner: [Hegy Thomas R](https://openairdocs.org/faa-owner/HEGY%20THOMAS%20R) - Location: [Hartford, WI](https://openairdocs.org/faa-place/WI/Hartford) - Owner type: Individual - Owner's area on the map: 43.3163° N, 88.3711° W: Placed by OpenAirDocs at the center of ZIP code 53027, within about 5 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=397TH - Page: https://openairdocs.org/aircraft/N397TH From the FAA registry file of October 22, 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 W670 model are included. ## ADs that may apply (OpenAirDocs): 2 in force ### Matched by airframe (Hegy Thomas R H-4000) None in force. ### Matched by engine (Continental W670 series) - [AD 53-09-04](https://openairdocs.org/ad/53-09-04): Propeller Blades · Continental W-670-9A - [AD 50-12-01](https://openairdocs.org/ad/50-12-01): Propeller Blade · Hamilton Standard Propeller Blades, W670-16, W670-6A and 1 more ## Information bulletins (advisory) None matched. ## NTSB investigations None matched to N397TH. ## FAA accident and incident reports None matched to N397TH. ## 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) (19) 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 engine (Continental W670 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 W670-16 - [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 W670-16 - [STC SE8776SW](https://openairdocs.org/stc/SE8776SW): Installation of coated cylinders and piston rings. Continental Motors, Inc - [STC SE7492SW](https://openairdocs.org/stc/SE7492SW): Install Delco starter P/N 1108684 or Eclipse/Bendix Utica model E80 starters. Rare Aircraft Ltd. Lists W670-16 - [STC SE04136AT](https://openairdocs.org/stc/SE04136AT): Installation of Bendix Scintilla WL-7A Battery Ignition Timer (distributor) modified from a breaker points and condenser design to a Hall Effect electronic sensor design. Air Repair Inc. Lists W670-23 - [STC SE00809WI](https://openairdocs.org/stc/SE00809WI): Installation of a modified alternate source of supply, engine ignition coil assembly and condenser. Air Repair Inc. Lists W670-23 - [STC SE01652WI](https://openairdocs.org/stc/SE01652WI): Modification of engine to replace contact points and condenser controlled Bendix Scintilla WL-7A battery timer (distributor) with an electronically controlled WL-7A-M battery timer. Radial Engines Ltd. Lists W670-23 - [STC SE01144SE](https://openairdocs.org/stc/SE01144SE): Installation of Olde Thyme Aviation, Inc. pistons, P/N OTA-4032-T6 or Air Repair, Inc. pistons, P/Ns AR4177 (5 each) and AR4177-1 (2 each), to replace Teledyne Continental Motors pistons P/N 4177. Air Repair Inc. Lists W670-16 - [STC SE01243WI](https://openairdocs.org/stc/SE01243WI): Installation of Barron Aviation intake tube drain kits on the engines listed on the attached FAA Approved Model List (AML) No. SE01243WI, dated April 26, 2004, or later FAA Approved revision. Barron Aviation. Lists W670-16 - [STC SE01145SE](https://openairdocs.org/stc/SE01145SE): Option 1) Installation of Olde Thyme Aviation Inc. crankshaft bearings OTA-21201-AB (rear) and OTA-21301-FB (front) Option 2) Installation of Olde Thyme Aviation Inc. replacement intake valve guides P/N OTA-20241-IG Option 3) Installation of Olde Thyme Aviation Inc. replacement exhaust valve guides P/N OTA-20406-EG. Air Repair Inc. Lists W670-16 - [STC SE01146SE](https://openairdocs.org/stc/SE01146SE): Option 1) Installation of Gold Coast Aviation crankshaft bearings GCA-21201-AB (rear) and GCA-21301-FB (front) Option 2) Installation of Gold Coast Aviation replacement intake valve guides P/N GCA-20241-IG Option 3) Installation of Gold Coast Aviation replacement exhaust valve guides P/N GCA-20406-EG. Gold Coast Aviation Service Inc. Lists W670-16 - [STC SE00946LA](https://openairdocs.org/stc/SE00946LA): Installation of engine crankshaft front and rear bearings. Holloway Engineering Co. Lists W670-6A - [STC SE00372LA](https://openairdocs.org/stc/SE00372LA): Installation of a Jacobs shielded ignition harness on Teledyne Continental Motors engine models. Aero Engines Inc. Lists W670-16 - [STC SE7491SW](https://openairdocs.org/stc/SE7491SW): Install Scintilla VNM-7DFA magnetos on W-670-6A and -6N engines. Air Repair - [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 - [STC SE4127SW](https://openairdocs.org/stc/SE4127SW): Install modified W-670-23 piston, P/N 4180, to replace W-670-6A piston, P/N 4177. Air Repair. Lists W670-6A - [STC SE2028CE](https://openairdocs.org/stc/SE2028CE): Add the following approved fuel: 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 SE5WE](https://openairdocs.org/stc/SE5WE): Compression ratio tank pistons. Salinas Engine Works. Lists W670-24 - [STC SE03079AT](https://openairdocs.org/stc/SE03079AT) (historical): Modify the Teledyne Continental W670 Series aircraft engines by replacing the crankshaft front and rear main ball bearings with higher capacity roller bearings. Air Repair Inc. Lists W670-16 ## Related - Other Hegy Thomas R H-4000 aircraft: https://openairdocs.org/model/hegy-thomas-r-h-4000/aircraft.md - The Continental W670 series engine: https://openairdocs.org/engine/continental-w670-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.