# N503GL: Great Lakes 2T-1A-1

- Status: Valid registration
- Airframe: [Great Lakes 2T-1A-1](https://openairdocs.org/model/great-lakes-2t-1a-1) (registry code 3910107, 2 seats)
- Engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508)
- Data sheets: [TCDS A18EA](https://openairdocs.org/tcds/A18EA) (WACO Classic Aircraft Corporation), [TCDS E-274](https://openairdocs.org/tcds/E-274) (Lycoming Engines) (OpenAirDocs)
- Serial number: 0503
- Type: Fixed wing single engine
- Engine type: Reciprocating
- Airworthiness: Standard
- Airworthiness date: November 15, 1973
- Certificate issued: October 5, 2023
- Expires: October 31, 2030
- Mode S code: A645B6
- Registered owner: [Womack Thomas G](https://openairdocs.org/faa-owner/WOMACK%20THOMAS%20G)
- Location: [Lonoke, AR](https://openairdocs.org/faa-place/AR/Lonoke)
- Owner type: Individual
- Owner's area on the map: 34.8095° N, 91.9085° W: Placed by OpenAirDocs at the center of ZIP code 72086, within about 7 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=503GL
- Page: https://openairdocs.org/aircraft/N503GL

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 0-320 model are included.

## ADs that may apply (OpenAirDocs): 45 in force

### Matched by airframe (Great Lakes 2T-1A-1)

- [AD 2022-03-15](https://openairdocs.org/ad/2022-03-15): Fuel Quantity Indicator · Garmin G3X Touch Electronic Flight Instrument System (STC SA01899WI or SA02658SE). Effective Mar 21, 2022
- [AD 2012-11-08](https://openairdocs.org/ad/2012-11-08): Horizontal Stabilizer Spar/Rib · WACO Classic 2T-1A, 2T-1A-1 and 2T-1A-2. Effective Jun 20, 2012
- [AD 2004-25-22](https://openairdocs.org/ad/2004-25-22): Engine induction system · Great Lakes 2T-1A-1 and 2T-1A-2. Effective Jan 28, 2005
- [AD 78-26-10 R1](https://openairdocs.org/ad/78-26-10-R1): Cockpit Heater System · Great Lakes 2T-1A-1 and 2T-1A-2. Effective Dec 17, 1986
- [AD 80-21-12 R1](https://openairdocs.org/ad/80-21-12-R1): Engine Oil System · Great Lakes 2T-1A-1 and 2T-1A-2. Effective Apr 14, 1983
- [AD 80-25-07 R1](https://openairdocs.org/ad/80-25-07-R1): Oil Coolers · American Champion 7ECA, 7GCAA, 7GCBC and 39 more. Effective Sep 24, 1981

### Matched by engine (Lycoming 0-320 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 2022-16-03](https://openairdocs.org/ad/2022-16-03): Engine (RECIPROCATING) · Continental Aerospace Technologies GTSIO-520-C, GTSIO-520-D, GTSIO-520-F and 236 more. Effective Aug 15, 2022
- [AD 2017-16-11](https://openairdocs.org/ad/2017-16-11): Reciprocating Engine Power Section · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-360-B1G6 and 93 more. Effective Aug 15, 2017
- [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 2010-07-08](https://openairdocs.org/ad/2010-07-08): Turbochargers · Kelly Aerospace Energy Systems HIO-360-E1AD, HIO-360-E1BD, HIO-360-F1AD and 137 more. Effective Apr 19, 2010
- [AD 2009-26-12](https://openairdocs.org/ad/2009-26-12): Cylinder assemblies · Engine Components Reciprocating Engine Cylinder Assemblies, AEIO-320-D1B, AEIO-320-D2B and 264 more. Effective Feb 4, 2010
- [AD 2007-04-19 R1](https://openairdocs.org/ad/2007-04-19-R1): SAP cylinder assemblies · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 314 more. Effective May 7, 2007
- [AD 2006-12-07](https://openairdocs.org/ad/2006-12-07): ECi cylinder assemblies · Aerostar AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 386 more. Effective Jul 11, 2006
- [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 2002-12-07](https://openairdocs.org/ad/2002-12-07): Oil Filter Converter Plate Gasket or the Converter Plate Kit · Lycoming Engines HIO-360-E1AD, HIO-360-E1BD, HIO-360-F1AD and 95 more. Effective Jul 3, 2002
- [AD 98-17-11](https://openairdocs.org/ad/98-17-11): Crankshafts · Continental Motors A-65-3, A-65-8, A75-8 and 90 more. Effective Oct 19, 1998
- [AD 98-02-08](https://openairdocs.org/ad/98-02-08): Crankshaft · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 216 more. Effective Mar 30, 1998
- [AD 98-01-06](https://openairdocs.org/ad/98-01-06): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 184 more. Effective Feb 13, 1998
- [AD 97-15-11](https://openairdocs.org/ad/97-15-11): Cylinder kits · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 538 more. Effective Aug 12, 1997
- [AD 96-09-10](https://openairdocs.org/ad/96-09-10): Oil pump · Lycoming Engines AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A and 334 more. Effective Jul 15, 1996
- [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 93-19-04](https://openairdocs.org/ad/93-19-04): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 184 more. Effective Oct 18, 1993
- [AD 92-12-05](https://openairdocs.org/ad/92-12-05): Piston Pins · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 532 more. Effective Jul 10, 1992
- [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 87-10-06 R1](https://openairdocs.org/ad/87-10-06-R1): Rocker Arm Assembly · Lycoming Engines IO-360-B4, IVO-360-A1A, O-340-A1A and 243 more. Effective Sep 1, 1989
- [AD 80-04-03 R2](https://openairdocs.org/ad/80-04-03-R2): Hydraulic Lifter · Lycoming Engines LO-360-E1A6D, LTO-360-E1A6D, O-320-H1AD and 7 more. Effective Apr 25, 1988
- [AD 81-16-05](https://openairdocs.org/ad/81-16-05): Magnetos · Lycoming Engines AEIO-320-E1B, AEIO-320-E2B, AEIO-360-B1G6 and 234 more. Effective Aug 6, 1981
- [AD 80-14-07](https://openairdocs.org/ad/80-14-07): Upper Exhaust Valve Spring Seats · Lycoming Engines LO-360-E1A6D, O-320-H1AD, O-320-H1BD and 5 more. Effective Jul 7, 1980
- [AD 79-10-03 R2](https://openairdocs.org/ad/79-10-03-R2): Engine Mounting Bracket Attaching Bolts · Lycoming Engines LO-360-E1A6D, O-320-H2AD and O-360-E1A6D. Effective Jul 1, 1980
- [AD 80-06-05](https://openairdocs.org/ad/80-06-05): Magnetos · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 254 more. Effective Mar 28, 1980
- [AD 78-12-09](https://openairdocs.org/ad/78-12-09): Crankshaft Gear Assembly · Lycoming Engines O-320-H1AD, O-320-H1BD, O-320-H2AD and 3 more. Effective Feb 20, 1979
- [AD 77-07-07](https://openairdocs.org/ad/77-07-07): Oil Level Gage · Lycoming Engines O-320-H2AD. Effective Feb 20, 1979
- [AD 77-20-07](https://openairdocs.org/ad/77-20-07): Loose Rocker Arm Retaining Studs and Hydraulic Tappets · Lycoming Engines O-320-H1AD, O-320-H1BD, O-320-H2AD and 3 more. Effective Aug 31, 1978
- [AD 78-12-08](https://openairdocs.org/ad/78-12-08): Oil Pump Body · Lycoming Engines O-320-H1AD, O-320-H1BD, O-320-H2AD and 3 more. Effective Jun 20, 1978
- [AD 75-08-09](https://openairdocs.org/ad/75-08-09): Oil Pump Drive Shaft · Lycoming Engines AEIO-360-A1B, AEIO-360-A1B6, AEIO-360-A1C and 365 more. Effective Aug 18, 1977
- [AD 73-23-01](https://openairdocs.org/ad/73-23-01): Piston Pin Assembly · Lycoming Engines AIO-360-A1A, AIO-360-A1B, AIO-360-A2A and 215 more. Effective Jan 13, 1977
- [AD 69-24-03](https://openairdocs.org/ad/69-24-03): Carburetors · Continental Motors A-65-1, A-65-12, A-65-12F and 321 more. Effective Nov 29, 1969
- [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
- [AD 63-23-02](https://openairdocs.org/ad/63-23-02): Exhaust Valves · Lycoming Engines O-320-A1A, O-320-A1B, O-320-A2A and 25 more. Effective Aug 6, 1968
- [AD 67-01-04](https://openairdocs.org/ad/67-01-04): Oil Filters · Full flow oil filter (Superior Flow STC SA401SW or 2 others). Effective Jan 2, 1967
- [AD 66-20-04](https://openairdocs.org/ad/66-20-04): Oil Filter Adapter Gasket · Lycoming Engines IO-320-A1A, IO-320-A2A, IO-320-B1A and 121 more. Effective Aug 27, 1966
- [AD 64-16-05](https://openairdocs.org/ad/64-16-05): AC Pumps · Lycoming Engines HIO-360-B1A, HIO-360-B1B, IO-320-B1A and 86 more. Effective Jul 10, 1964
- [AD 59-10-07](https://openairdocs.org/ad/59-10-07): Cylinder Baffle Clamps · Lycoming Engines GO-480-A1A, GO-480-B, GO-480-B1A6 and 58 more
- [AD 55-02-02](https://openairdocs.org/ad/55-02-02): Gasket · Lycoming Engines O-320-A1A and O-320-A2A

### Historical (superseded or no longer in force)

- [AD 79-20-08](https://openairdocs.org/ad/79-20-08) (historical): Induction System · Great Lakes 2T-1A-1 and 2T-1A-2. Effective Oct 8, 1979
- [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
- [AD 2008-19-05](https://openairdocs.org/ad/2008-19-05) (historical): Parallel Valve'' reciprocating engines · Engine Components Reciprocating Engine Cylinder Assemblies, AEIO-320-D1B, AEIO-320-D2B and 262 more. Effective Oct 20, 2008
- [AD 2005-26-10](https://openairdocs.org/ad/2005-26-10) (historical): ECi cylinder assemblies. · Lycoming Engines AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 413 more. Effective Jan 31, 2006
- [AD 2000-18-53](https://openairdocs.org/ad/2000-18-53) (historical): Oil Filter Converter Plate Gaskets · Textron Lycoming, AVCO AEIO-540, IO-360-A1B6D, IO-360-A1D6D and 73 more
- [AD 81-18-04 R2](https://openairdocs.org/ad/81-18-04-R2) (historical): Engine Oil Pump Driven Impeller and Shaft · Textron Lycoming, AVCO AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A and 376 more. Effective Jun 7, 1982

## Information bulletins (advisory) (9 in force)

- [SAIB NE-06-31R6](https://openairdocs.org/saib/NE-06-31R6): Engine Lubricating Oils. Issued Sep 26, 2022
- [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-08-32R1](https://openairdocs.org/saib/NE-08-32R1): Propeller Governor  Idler Gear Shaft Set Screw. Issued May 13, 2016
- [SAIB NE-14-13](https://openairdocs.org/saib/NE-14-13): Reciprocating Engine - Cylinder Mounting Studs. Issued Mar 24, 2014
- [SAIB NE-13-06](https://openairdocs.org/saib/NE-13-06): Pushrod Shroud Spring Retainers, Engine Components Part No. AEL14995, for Lycoming Engines 320, 360, and 540 Series Engines. Issued Nov 21, 2012
- [SAIB NE-08-26R3](https://openairdocs.org/saib/NE-08-26R3): Magneto/Distributor. Issued Mar 31, 2011
- [SAIB NE-06-32R1](https://openairdocs.org/saib/NE-06-32R1): Reciprocating Engine - Crankshaft. Issued Sep 10, 2008
- [SAIB NE-03-18](https://openairdocs.org/saib/NE-03-18): . Issued Jan 22, 2003
- [SAIB NE-00-22](https://openairdocs.org/saib/NE-00-22): . Issued May 23, 2000
- [SAIB NE-06-31R5](https://openairdocs.org/saib/NE-06-31R5) (historical): Engine Lubricating Oils. Issued Oct 19, 2011
- [SAIB NE-06-31R4](https://openairdocs.org/saib/NE-06-31R4) (historical): Engine Lubricating Oils. Issued Jul 6, 2011
- [SAIB NE-06-31R3](https://openairdocs.org/saib/NE-06-31R3) (historical): Engine Lubricating Oils. Issued Jul 22, 2009
- [SAIB NE-06-31R2](https://openairdocs.org/saib/NE-06-31R2) (historical): Engine Lubricating Oils. Issued Apr 29, 2009
- [SAIB NE-08-26R1](https://openairdocs.org/saib/NE-08-26R1) (historical): Dual Magnetos. Issued Jul 8, 2008
- [SAIB NE-08-32](https://openairdocs.org/saib/NE-08-32) (historical): Propeller Governor Set Screw. Issued Jul 3, 2008
- [SAIB NE-06-31R1](https://openairdocs.org/saib/NE-06-31R1) (historical): . Issued Apr 18, 2006
- [SAIB NE-06-31](https://openairdocs.org/saib/NE-06-31) (historical): . Issued Feb 27, 2006

## NTSB investigations (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CEN21LA267](https://openairdocs.org/ntsb/CEN21LA267), Jun 14, 2021: Great Lakes 2T-1A-1 (N503GL), Roanoke, TX, substantial damage. Probable cause: Inadequate maintenance of the brake system which resulted in the caliper binding closed and the subsequent loss of directional control during the landing roll.

## 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.

- [Accident 20210614014849A](https://openairdocs.org/incident/20210614014849A), Jun 14, 2021: Great Lakes 2T-1A-1 (N503GL), Roanoke, TX, Substantial damage. During a local flight, landing on rwy 17, with shifting winds, the left brake seemed to have more effect than the right brake. The aircraft departed the runway…

## 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) (117, first 50)

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 (Great Lakes 2T-1A-1)

- [STC SA04652CH](https://openairdocs.org/stc/SA04652CH): To allow use of 100R grade aviation fuel meeting Swift Fuel, LLC specification. Swift Fuels LLC
- [STC SA02636SE](https://openairdocs.org/stc/SA02636SE): Installation of Garmin GPS 175 Navigation System and GNX 375 Navigation System with ADS-B In/Out Transponder. Garmin International Inc
- [STC SA02019SE-D](https://openairdocs.org/stc/SA02019SE-D): Installation of Garmin Model GTN 625/635/650; 725/750 Navigation System. Garmin International Inc
- [STC SA04046CH PAGE 2](https://openairdocs.org/stc/SA04046CH%20PAGE%202): Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500). Acron Aviation Inc
- [STC SA7965SW](https://openairdocs.org/stc/SA7965SW): Application of fabric and polyurethane finishing system. Shady Aviation LLC
- [STC SA04378CH](https://openairdocs.org/stc/SA04378CH): Installation of an engine modified per STC SE04349CH. SureFly Partners Ltd
- [STC SA02594SE](https://openairdocs.org/stc/SA02594SE): SkyView HDX Instrumentation and Autopilot System manufactured. Dynon Avionics
- [STC SA01757WI](https://openairdocs.org/stc/SA01757WI): To allow the use of UL91 or UL94 (minimum) grade aviation fuel. Swift Fuels LLC
- [STC SA02658SE](https://openairdocs.org/stc/SA02658SE): Installation of Garmin GI 275 Multi-Function Display System. Garmin International 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 SA02444AK](https://openairdocs.org/stc/SA02444AK): Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed. ADS-B Technologies LLC
- [STC SA03819NY](https://openairdocs.org/stc/SA03819NY): Installation and maintenance of Oratex 6000 Covering and Coating System. Lanitz-Prena Folien Factory GmbH
- [STC SA01818WI](https://openairdocs.org/stc/SA01818WI): Installation of Garmin G5 Electronic Flight Instrument. Garmin International Inc
- [STC SA00401BO](https://openairdocs.org/stc/SA00401BO): Installation of a SkyTrax100B UAT receiver. Avidyne Corporation
- [STC SA2368CE](https://openairdocs.org/stc/SA2368CE): Installation of plywood covering on the bottom of the wing center section. Great Lakes Aircraft Company LLC
- [STC SA00410BO](https://openairdocs.org/stc/SA00410BO): Installation of an AV-30-C Multi-Mode Indicator. uAvionix Corporation
- [STC SA01831WI](https://openairdocs.org/stc/SA01831WI): To allow the use of UL91 (minimum) grade aviation fuel. Petersen Aviation Inc
- [STC SA01714WI](https://openairdocs.org/stc/SA01714WI): Installation of a Garmin transponders: (a) GTX 330/330D/33/33D with ADS-B Out functionality; (b) GTX 335/335R/345/345R with ADS-B Out and In functionality; or (c) GTX 335R/345R with ADS-B Out functionality in select airplanes installed with G950/G1000 systems. Garmin International Inc
- [STC SA2586NM](https://openairdocs.org/stc/SA2586NM): Installation of J.P. Instruments temperature monitoring systems. J P Instruments
- [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 SA02119SE PAGE 2](https://openairdocs.org/stc/SA02119SE%20PAGE%202): Installation of Garmin GDL 88 ADS-B UAT Transceiver System. Garmin International Inc
- [STC SA00478CH](https://openairdocs.org/stc/SA00478CH): Installation of Cooper Superflite 102 Fabric. Aviation Products Systems Inc
- [STC SA02442AK PAGE 2](https://openairdocs.org/stc/SA02442AK%20PAGE%202): Approval of the L-3 Communications NGT 2000/2500 ADS-B system. ADS-B Technologies, LLC
- [STC SA01669CH](https://openairdocs.org/stc/SA01669CH): Installation of Challenger Reusable Air Filter. Challenger Aviation Products Inc
- [STC SA02283SE PAGE 2](https://openairdocs.org/stc/SA02283SE%20PAGE%202): Installation of Electronics International Inc. Glass Panel Engine Monitor (with In Flight Data) CGR-30P. Electronics International Inc
- [STC SA02402SE PAGE 2](https://openairdocs.org/stc/SA02402SE%20PAGE%202): Installation of Electronics International Inc. Glass Panel Engine Monitor (with In-Flight Data) CGR-30C. Electronics International Inc
- [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 SA01487SE-D](https://openairdocs.org/stc/SA01487SE-D): Installation of a GDL 69 or GDL 69A XM Satellite Receiver. Garmin International Inc
- [STC SA2775SO](https://openairdocs.org/stc/SA2775SO): Installation of an emergency induction air door in accordance with Aircraft Specialist Installation Instructions, Alternate Air Door Adapter, dated April 30, 1990, or later FAA approved revision and Drawing Nos. AAD 16670-1, revised April 21, 1990; AAD 16670-2, revised April 21, 1990; and AAD16670-3, dated April 21, 1990, or later FAA approved revisions. WACO Classic Aircraft Corporation
- [STC SA563CH](https://openairdocs.org/stc/SA563CH): Authorizes installation of engines equipped w/Unison Limited Authority Spark Advance Regulator (LASAR) ignition system w/Cylinder Head Temp. (CHT) monitoring capability on airframes. engines. Champion Aerospace LLC
- [STC SA2683NM](https://openairdocs.org/stc/SA2683NM): Installation of Precise Flight, Inc. stand-by vacuum system (SVS). Precise Flight Inc
- [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 SA00194AT](https://openairdocs.org/stc/SA00194AT): Installation of Appalachian Accessories carbon steel brake discs that have the melonite surface treatment, P/N AA-40. Aviation Products, Inc
- [STC SA1626NM PAGE 1](https://openairdocs.org/stc/SA1626NM%20PAGE%201): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series). Electronics International
- [STC SA2102CE](https://openairdocs.org/stc/SA2102CE): 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 SA2350NM PAGE 1](https://openairdocs.org/stc/SA2350NM%20PAGE%201): 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 SA3862NM PAGE 1](https://openairdocs.org/stc/SA3862NM%20PAGE%201): Installation of Electronics International Primary TIT/EGT/CHT instruments, remote switches and associated accessories. Electronics International
- [STC SA1982SO](https://openairdocs.org/stc/SA1982SO): Installation of Appalachian stainless steel brake discs P/N 75-40. Appalachian Accessories
- [STC SA2190NM PAGE 2](https://openairdocs.org/stc/SA2190NM%20PAGE%202): Installation of electronics International Digital Volt/Amp Gauges and Accessories. Electronics International
- [STC SA001410BO](https://openairdocs.org/stc/SA001410BO) (historical): Installation of an AV-30-C Multi-Mode Indicator. uAvionix Corporation
- [STC SA02019SE-D PAGE 2](https://openairdocs.org/stc/SA02019SE-D%20PAGE%202) (historical): Installation of Garmin GTN 6XX/7XX Navigation System. Garmin International Inc
- [STC SA02153LA-D](https://openairdocs.org/stc/SA02153LA-D) (historical): Installation of Garmin G600 Primary Flight Display (PFD) and Multifunction Display (MFD) System. Garmin International Inc
- [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 (Lycoming 0-320 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 O-320-A1A
- [STC SE00825WI](https://openairdocs.org/stc/SE00825WI): Installation of Specialty Products Spin-on oil filter on Lycoming Engines. B & C Specialty Products Inc. Lists O-320-A1A
- [STC SE2932SW](https://openairdocs.org/stc/SE2932SW): Install carburetor air temperature indicator. Approved for Aircooled Motors (Franklin Engine Co.) equipped with float carburetors. Model eligibility included here may not be inclusive. Alcor LLC

All 117: https://openairdocs.org/aircraft/N503GL/stcs.md

## Related

- Other Great Lakes 2T-1A-1 aircraft: https://openairdocs.org/model/great-lakes-2t-1a-1/aircraft.md
- The Lycoming 0-320 series engine: https://openairdocs.org/engine/lycoming-0-320-series.md

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