# N531DF: 2007 Forsland Kent GS-2 SPORTSMAN - Status: Valid registration - Airframe: [Forsland Kent GS-2 SPORTSMAN](https://openairdocs.org/model/forsland-kent-gs-2-sportsman) (registry code 05622RW, 4 seats) - Engine: [Lycoming IO-390 series](https://openairdocs.org/engine/lycoming-io-390-series) (registry code 41678) - Data sheets: [TCDS E00006NY](https://openairdocs.org/tcds/E00006NY) (Lycoming Engines) (OpenAirDocs) - Serial number: 7191 - Year built: 2007 - Type: Fixed wing single engine - Engine type: 4 cycle - Kit: Glasair Aviation LLC GS-2 SPORTSMAN - Airworthiness: Experimental, amateur built - Airworthiness date: February 21, 2007 - Certificate issued: April 9, 2022 - Expires: April 30, 2029 - Mode S code: A6B475 - Registered owner: [Copper Mountain Ranch Aviation LLC](https://openairdocs.org/faa-owner/COPPER%20MOUNTAIN%20RANCH%20AVIATION%20LLC) - Location: [Hill City, SD](https://openairdocs.org/faa-place/SD/Hill%20City) - Owner type: LLC - Owner's area on the map: 44.0154° N, 103.7831° W: Placed by OpenAirDocs at the center of ZIP code 57745, within about 11 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=531DF - Page: https://openairdocs.org/aircraft/N531DF 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 IO-390 model are included. ## ADs that may apply (OpenAirDocs): 4 in force ### Matched by airframe (Forsland Kent GS-2 SPORTSMAN) None in force. ### Matched by engine (Lycoming IO-390 series) - [AD 2026-04-11](https://openairdocs.org/ad/2026-04-11): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 605 more. Effective Apr 8, 2026 - [AD 2012-19-01](https://openairdocs.org/ad/2012-19-01): Crankshafts · Lycoming Engines AEIO-360-A1A, AEIO-360-A1B, AEIO-360-A1B6 and 321 more. Effective Oct 24, 2012 - [AD 2012-03-06](https://openairdocs.org/ad/2012-03-06): Fuel servo diaphragm · Continental Motors 6-260-A, 6-285-A, 6-285-B and 482 more. Effective Feb 24, 2012 - [AD 2009-02-03](https://openairdocs.org/ad/2009-02-03): Fuel injection servos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 261 more. Effective Feb 9, 2009 ### Historical (superseded or no longer in force) - [AD 2024-21-02](https://openairdocs.org/ad/2024-21-02) (historical): Engine (Reciprocating) · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 548 more. Effective Dec 5, 2024 ## Information bulletins (advisory) (2 in force) - [SAIB NE-19-08](https://openairdocs.org/saib/NE-19-08): Reciprocating Engine Cylinder Section - Lycoming Engines Parallel Valve Cylinders. Issued May 2, 2019 - [SAIB NE-14-13](https://openairdocs.org/saib/NE-14-13): Reciprocating Engine - Cylinder Mounting Studs. Issued Mar 24, 2014 ## NTSB investigations None matched to N531DF. ## 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 20150803013519I](https://openairdocs.org/incident/20150803013519I), Aug 3, 2015: Forsland Kent GS-2 SPORTSMAN (N531DF), Hayward, WI, Minor damage. During takeoff roll on runway 02 at hyr (Hayward, WI) aircraft departed off side of runway into a dry marsh area. Airport winds were reported 310 at 7 knots… ## Reports on N531DF not matched to an aircraft (1) They name N531DF, but no registry record covers the date, the aircraft registered then was built later, or the report describes another aircraft. - [Incident 19850906057009I](https://openairdocs.org/incident/19850906057009I), Sep 6, 1985: Beech A100 (N531DF), Alexandria, LA. During takeoff roll right propeller struck a pack of dogs on runway. Aborted takeoff. ## 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) (6) 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 (Lycoming IO-390 series) - [STC SE00825WI](https://openairdocs.org/stc/SE00825WI): Installation of Specialty Products Spin-on oil filter on Lycoming Engines. B & C Specialty Products Inc. Lists IO-390-A1A6 - [STC SE04349CH](https://openairdocs.org/stc/SE04349CH): Installation of SureFly electronic ignition. SureFly Partners Ltd. Lists IO-390-A1A6 - [STC SE02352CH](https://openairdocs.org/stc/SE02352CH): Installation of Challenger cleanable oil filter assembly. Challenger Aviation Products Inc. Lists IO-390-A1A6 - [STC SE03232CH](https://openairdocs.org/stc/SE03232CH): Installation of Engine Preheat Kit p/n TA2925-1 for 115 volt application. Hartzell Propeller Inc. Lists IO-390-A1A6 - [STC SE04577CH](https://openairdocs.org/stc/SE04577CH): Install an electronic engine ignition system. Electroair Acquisition Corp. Lists IO-390-A1A6 - [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 IO-390-C1A6 ## Related - Other Forsland Kent GS-2 SPORTSMAN aircraft: https://openairdocs.org/model/forsland-kent-gs-2-sportsman/aircraft.md - The Lycoming IO-390 series engine: https://openairdocs.org/engine/lycoming-io-390-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.