# TCDS 2A4: Twin Commander Aircraft LLC - Type: Type certificate data sheet - Status: Current - Holder: Twin Commander Aircraft LLC - Revision: 50 - Revised: November 18, 2024 - Product: Aircraft, Small Airplane - Certification basis: CAR 3 - Registered aircraft: 277, by the registry models matched to it (OpenAirDocs) - Data sheet PDF: https://openairdocs.org/files/sha256/64/f4/64f46406a35fb4bddc472ea7ab687486e6449107d75b6066b20807d44547484e - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID154679920420241120192109.0001 - Page: https://openairdocs.org/tcds/2A4 ## Models (21) As the data sheet lists them. - 680-V - 680-F(P) - 680-F - 680-E - 695B - 690C - 560-F - 720 - 690A - 680-W - 690D - 690B - 680-FL(P) - 695 - 680-FL - 680 - 681 - 685 - 695A - 690 - 680-T ## ADs (55, first 50, in force first) - [AD 2023-09-09](https://openairdocs.org/ad/2023-09-09): Exhaust Turbine System (Recip) · Aerostar PA-60-600 (Aerostar 600), PA-60-601 (Aerostar 601), PA-60-601P (Aerostar 601P) and 292 more. Effective Jul 17, 2023 - [AD 2013-09-05](https://openairdocs.org/ad/2013-09-05): Fuselage · Twin Commander 690, 690A and 690B. Effective May 29, 2013 - [AD 84-10-07](https://openairdocs.org/ad/84-10-07): Emergency LG Extension System Modification · Twin Commander 680-T, 680-V, 680-W and 1 more. Effective Jun 23, 2011 - [AD 2009-25-02](https://openairdocs.org/ad/2009-25-02): Upper wing skins · Twin Commander 690, 690A and 690B. Effective Jan 8, 2010 - [AD 2006-16-18 R1](https://openairdocs.org/ad/2006-16-18-R1): Installing a warning placard on the TAWS/RMI · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 100 more. Effective Jul 18, 2008 - [AD 2006-15-01](https://openairdocs.org/ad/2006-15-01): Inboard and center aileron hinge fittings · Twin Commander 690, 690A and 690B. Effective Aug 21, 2006 - [AD 2005-18-20](https://openairdocs.org/ad/2005-18-20): "FASTprop" propeller de-icers · Hartzell PHC-C3YF-1RF/F8468A(B,K)-8R constant speed propeller (STC SA00718LA or 17 others). Effective Oct 14, 2005 - [AD 2005-01-19](https://openairdocs.org/ad/2005-01-19): Mode S transponders · GARMIN International GTX 330D, GTX 330, GTX 33D and 830 more. Effective Feb 23, 2005 - [AD 2003-07-03](https://openairdocs.org/ad/2003-07-03): Wing and fuselage structure · Twin Commander 690D, 695A and 695B. Effective May 16, 2003 - [AD 2000-02-30](https://openairdocs.org/ad/2000-02-30): Airframe Pneumatic Deicing Boots · Twin Commander 680, 680-E, 680-F and 15 more. Effective Mar 24, 2000 - [AD 98-08-25 R1](https://openairdocs.org/ad/98-08-25-R1): Nose Landing Gear (NLG) Drag Link Bolt · Twin Commander 500-S, 500-U, 680-F and 9 more. Effective Jan 5, 1999 - [AD 98-20-34](https://openairdocs.org/ad/98-20-34): Airplane Flight Manuals--Severe Icing Conditions · Twin Commander 500, 500-A, 500-B and 24 more. Effective Nov 3, 1998 - [AD 98-14-03](https://openairdocs.org/ad/98-14-03): Transponders · Cessna 172, 172A, 172B and 230 more. Effective Aug 16, 1998 - [AD 98-07-17](https://openairdocs.org/ad/98-07-17): Flap System · Twin Commander 500, 500-A, 500-B and 27 more. Effective May 29, 1998 - [AD 98-08-19](https://openairdocs.org/ad/98-08-19): Wing to Fuselage Attachment Brackets and Straps · Twin Commander 500, 500-A, 500-B and 27 more. Effective May 18, 1998 - [AD 96-12-22](https://openairdocs.org/ad/96-12-22): Full Flow Engine Oil Adapter · Bellanca CH-300 Pacemaker, 120, 140 and 361 more. Effective Jul 31, 1996 - [AD 95-19-18](https://openairdocs.org/ad/95-19-18): Turbulent Air Penetration and Maneuvering Speeds · Twin Commander 680-T, 680-V, 680-W and 9 more. Effective Oct 25, 1995 - [AD 95-12-23](https://openairdocs.org/ad/95-12-23): Wing Structure · Twin Commander 690C and 695. Effective Jul 30, 1995 - [AD 95-13-02](https://openairdocs.org/ad/95-13-02): Twin Commander 685, 690, 690A and 5 more. Effective Jul 22, 1995 - [AD 94-04-12](https://openairdocs.org/ad/94-04-12): Wing Structure · Twin Commander 685, 690, 690A and 1 more. Effective Apr 12, 1994 - [AD 94-04-13](https://openairdocs.org/ad/94-04-13): Spar Cap · Twin Commander 500, 500-A, 500-B and 17 more. Effective Apr 12, 1994 - [AD 94-04-14](https://openairdocs.org/ad/94-04-14): Spar Cap · Twin Commander 500-S, 500-U, 680-FL(P) and 6 more. Effective Apr 12, 1994 - [AD 94-04-15](https://openairdocs.org/ad/94-04-15): Spar Cap · Twin Commander 500, 560-A, 560-E and 3 more. Effective Apr 12, 1994 - [AD 94-04-11](https://openairdocs.org/ad/94-04-11): Spar Cap · Twin Commander 500-S and 690B. Effective Apr 11, 1994 - [AD 87-21-07 R1](https://openairdocs.org/ad/87-21-07-R1): Fuel Filler Openings · Twin Commander 500, 500-A, 500-B and 16 more. Effective May 5, 1989 - [AD 87-24-07 R1](https://openairdocs.org/ad/87-24-07-R1): POH/AFM Revision - Icing · Twin Commander 690, 690A, 690B and 5 more. Effective Feb 9, 1988 - [AD 84-19-05](https://openairdocs.org/ad/84-19-05): Engine Mount Systems · Twin Commander 690, 690A, 690B and 4 more. Effective Oct 8, 1984 - [AD 82-23-05](https://openairdocs.org/ad/82-23-05): Induction Air Elbow · Twin Commander 685. Effective Nov 15, 1982 - [AD 75-12-09 R2](https://openairdocs.org/ad/75-12-09-R2): Inadvertent Structural Failure · Twin Commander 500, 500-A, 500-B and 12 more. Effective Nov 28, 1981 - [AD 79-07-02](https://openairdocs.org/ad/79-07-02): Batteries · Aircraft Parts & Development A, A-2, A-3 and 149 more. Effective Apr 3, 1979 - [AD 78-05-06](https://openairdocs.org/ad/78-05-06): Flexible Fuel Cells · Cessna 180, 182, 185 and 98 more. Effective Jun 30, 1978 - [AD 77-03-01](https://openairdocs.org/ad/77-03-01): Left and Right Wing Rivets · Twin Commander 690, 690A and 690B. Effective Feb 16, 1977 - [AD 77-04-01](https://openairdocs.org/ad/77-04-01): Trim System · Twin Commander 690A. Effective Feb 14, 1977 - [AD 75-19-01](https://openairdocs.org/ad/75-19-01): Flap Speed · Twin Commander 685, 690 and 690A. Effective Sep 8, 1975 - [AD 75-12-10](https://openairdocs.org/ad/75-12-10): Autopilots · M7 Aerospace 60, 95-C55, 95-C55A and 17 more. Effective Jun 11, 1975 - [AD 75-08-07](https://openairdocs.org/ad/75-08-07): Bleed Air Line · Twin Commander 690A. Effective Apr 10, 1975 - [AD 75-08-05](https://openairdocs.org/ad/75-08-05): Battery Disconnect · Twin Commander 690A. Effective Apr 5, 1975 - [AD 74-20-12](https://openairdocs.org/ad/74-20-12): Pilot and Co-pilot Side Windows · Twin Commander 690A. Effective Oct 4, 1974 - [AD 73-13-09](https://openairdocs.org/ad/73-13-09): Oil Supply Line Failure · Twin Commander 690. Effective Jun 25, 1973 - [AD 73-06-02](https://openairdocs.org/ad/73-06-02): Fuel Siphoning · Twin Commander 500, 500-A, 500-B and 13 more. Effective Mar 19, 1973 - [AD 67-28-01](https://openairdocs.org/ad/67-28-01): Lower Front Spar Cap · Twin Commander 560-E, 680, 680-E and 1 more. Effective Oct 10, 1967 - [AD 67-26-04](https://openairdocs.org/ad/67-26-04): Altimeters · Bell Helicopter Textron Canada 206A, 150G, 172H (USAF T-41A) and 36 more - [AD 67-22-01](https://openairdocs.org/ad/67-22-01): Main Landing Gear · Twin Commander 500-A, 500-B, 560-F and 4 more. Effective Aug 28, 1967 - [AD 64-02-01](https://openairdocs.org/ad/64-02-01): Main Landing Gear · Twin Commander 500-A, 500-B, 560-F and 2 more. Effective Feb 20, 1964 - [AD 62-08-01](https://openairdocs.org/ad/62-08-01): Fuel Pressure Gauge Drain Line · Twin Commander 680-F and 720. Effective Apr 10, 1962 - [AD 62-05-01](https://openairdocs.org/ad/62-05-01): Alternate Induction Air Valve · Twin Commander 680-F, 680-FL, 680-FL(P) and 1 more. Effective Mar 6, 1962 - [AD 60-20-01](https://openairdocs.org/ad/60-20-01): Wing Rivet Replacement · Twin Commander 680-E and 720. Effective Oct 28, 1960 - [AD 57-09-01](https://openairdocs.org/ad/57-09-01): Aileron Bellcrank Casting · Twin Commander 520, 560, 560-A and 1 more - [AD 57-15-01](https://openairdocs.org/ad/57-15-01): Landing Gear Retaining Pins · Twin Commander 560-A, 560-E and 680 - [AD 58-01-01](https://openairdocs.org/ad/58-01-01): Fuel Vent Line Replacement · Twin Commander 520, 560, 560-A and 2 more All 55: https://openairdocs.org/tcds/2A4/ads.md ## Registered aircraft by registry model (OpenAirDocs) - [Rockwell International 690B](https://openairdocs.org/model/rockwell-international-690b): 59 aircraft (registry code 7630516) - [Rockwell International 690A](https://openairdocs.org/model/rockwell-international-690a): 34 aircraft (registry code 7630515) - [Aero Commander 690A](https://openairdocs.org/model/aero-commander-690a): 22 aircraft (registry code 0141722) - [Rockwell International 690C](https://openairdocs.org/model/rockwell-international-690c): 21 aircraft (registry code 7630517) - [Gulfstream AM Corp Comm Div 695A](https://openairdocs.org/model/gulfstream-am-corp-comm-div-695a): 17 aircraft (registry code 3970411) - [Gulfstream AM Corp Comm Div 690C](https://openairdocs.org/model/gulfstream-am-corp-comm-div-690c): 14 aircraft (registry code 3970404) - [Aero Commander 680](https://openairdocs.org/model/aero-commander-680): 12 aircraft (registry code 0141602) - [Gulfstream AM Corp Comm Div 690D](https://openairdocs.org/model/gulfstream-am-corp-comm-div-690d): 12 aircraft (registry code 3970405) - [Rockwell International 695](https://openairdocs.org/model/rockwell-international-695): 12 aircraft (registry code 7630518) - [Aero Commander 680-F](https://openairdocs.org/model/aero-commander-680-f): 11 aircraft (registry code 0141606) - [Aero Commander 680FL](https://openairdocs.org/model/aero-commander-680fl): 10 aircraft (registry code 0141608) - [Aero Commander 685](https://openairdocs.org/model/aero-commander-685): 8 aircraft (registry code 0141612) - [Aero Commander 560-F](https://openairdocs.org/model/aero-commander-560-f): 6 aircraft (registry code 0141408) - [Aero Commander 681](https://openairdocs.org/model/aero-commander-681): 6 aircraft (registry code 0141718) - [Gulfstream Aerospace 695B](https://openairdocs.org/model/gulfstream-aerospace-695b): 6 aircraft (registry code 3970610) - [Aero Commander 680FL P](https://openairdocs.org/model/aero-commander-680fl-p): 5 aircraft (registry code 0141610) - [Aero Commander 680-E](https://openairdocs.org/model/aero-commander-680-e): 4 aircraft (registry code 0141604) - [Aero Commander 680W](https://openairdocs.org/model/aero-commander-680w): 4 aircraft (registry code 0141716) - [Aero Commander 690](https://openairdocs.org/model/aero-commander-690): 3 aircraft (registry code 0141720) - [Aero Commander 680T](https://openairdocs.org/model/aero-commander-680t): 2 aircraft (registry code 0141712) - [Aero Commander 680V](https://openairdocs.org/model/aero-commander-680v): 2 aircraft (registry code 0141714) - [Gulfstream Aerospace 695A](https://openairdocs.org/model/gulfstream-aerospace-695a): 2 aircraft (registry code 3970600) - [Twin Commander 690C](https://openairdocs.org/model/twin-commander-690c): 2 aircraft (registry code 3970504) - [Aero Commander 720](https://openairdocs.org/model/aero-commander-720): 1 aircraft (registry code 0141802) - [Gulfstream AM Corp Comm Div 695](https://openairdocs.org/model/gulfstream-am-corp-comm-div-695): 1 aircraft (registry code 3970410) - [Twin Commander 690B](https://openairdocs.org/model/twin-commander-690b): 1 aircraft (registry code 3970505) - [Aero Commander 690B](https://openairdocs.org/model/aero-commander-690b): 0 aircraft (registry code 0141723) - [Rockwell Commander 690A](https://openairdocs.org/model/rockwell-commander-690a): 0 aircraft (registry code 7630521) - [Rockwell International 685](https://openairdocs.org/model/rockwell-international-685): 0 aircraft (registry code 7630513) - [Rockwell International 690](https://openairdocs.org/model/rockwell-international-690): 0 aircraft (registry code 7630514) - [Rockwell International 695A](https://openairdocs.org/model/rockwell-international-695a): 0 aircraft (registry code 7630519) ## STCs approved under this data sheet (453, first 50) - [STC SA01800SE](https://openairdocs.org/stc/SA01800SE): Fabrication and installation of new or replacement of existing instrument panel lights dimmer control.. TCW Technologies, LLC - [STC SA01861SE](https://openairdocs.org/stc/SA01861SE): Fabrication and installation of Landing Light Controller. TCW Technologies, LLC - [STC SA04837NY](https://openairdocs.org/stc/SA04837NY): Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights. AeroLED's Holdings, LLC - [STC SA02019SE-D (2 OF 3)](https://openairdocs.org/stc/SA02019SE-D%20(2%20OF%203)): Installation of Garmin Model GTN 625/635/650; 725/750 Navigation System. Garmin International Inc. - [STC SA800EA](https://openairdocs.org/stc/SA800EA): Installation of Whelen Anti-Collision, Position, or Anti-Collision/Position Light System, and applicable associated power supplies. Whelen Aerospace Technologies - [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 SA1024SO](https://openairdocs.org/stc/SA1024SO): Installation of AiResearch TPE331-5-252K engines replacing AiResearch TPE331-5-251K engines.. Carpe Diem Aviation Services of Missouri, Inc. dba CD Aviation Services - [STC SA11158SC](https://openairdocs.org/stc/SA11158SC): Demonstration of aircraft tolerance to potential electromagnetic interference from certain Transmitting Potable Electronic Devices (T-PEDS). Liberty Partners Inc. - [STC SA12202IB](https://openairdocs.org/stc/SA12202IB): Installation of Garmin GWX Weather Radar System. Maxcraft Avionics Ltd. - [STC SA11300DS](https://openairdocs.org/stc/SA11300DS): Upgrade previously installed Collins Aerospace Radar Altimeter. BHE & Associates Ltd. - [STC SA5581SW](https://openairdocs.org/stc/SA5581SW): Installation of ALCOR true-flow/ totalizer system. Alcor LLC - [STC SA8408SW](https://openairdocs.org/stc/SA8408SW): Replace the o-ring seals in the landing gear lower strut seal.. Metrea Special Aerospace ISR Inc. - [STC SA02738CH](https://openairdocs.org/stc/SA02738CH): Installation of L-3 Communications Avionics Systems. Acron Aviation 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 SA02386AK](https://openairdocs.org/stc/SA02386AK): Replacement of existing landing and/or taxi light reflector and bulbs with Light Emitting Diode (LED) lighting systems. AeroLED's Holding LLC - [STC SA02511SE (1 OF 2)](https://openairdocs.org/stc/SA02511SE%20(1%20OF%202)): Installation of replacement fuel quantity indicator sending unit(s). CiES Inc. - [STC SA02511SE (1 OF 3)](https://openairdocs.org/stc/SA02511SE%20(1%20OF%203)): Installation of replacement fuel quantity indicator sending unit(s). CiES Inc. - [STC SA02511SE (3 OF 3)](https://openairdocs.org/stc/SA02511SE%20(3%20OF%203)): Installation of replacement fuel quantity indicator sending unit(s). CiES Inc. - [STC SA02658SE (1 OF 2)](https://openairdocs.org/stc/SA02658SE%20(1%20OF%202)): Installation of Garmin GI 275 Multi-Function Display System. Garmin International Inc. - [STC SA02571SE](https://openairdocs.org/stc/SA02571SE): Installation of Garmin G500/G600 TXi Integrated Avionics System (Primary Flight Display, Multi-Function Display, and Engine Indicating System Display).. Garmin International Inc. - [STC SA02532AT](https://openairdocs.org/stc/SA02532AT): Installation of subject Michelin tires on appropriate aircraft. For Michelin 5, 6, 8, and 10-inch rim diameter tires on General Aviation Aircraft.. Michelin North America Inc. - [STC SA01586SE](https://openairdocs.org/stc/SA01586SE): Group Reduced Vertical Separation Minimum (RVSM). AeroMech Incorporated - [STC SA00756DE](https://openairdocs.org/stc/SA00756DE): Installation of Automatic Dependent Surveillance Broadcast (ADS-B) Out Equipment using a Trig Avionics TT22 Transponder and an approved Global Positioning System (GPS) Position Sensor. Peregrine - [STC SA02010WI](https://openairdocs.org/stc/SA02010WI): Installation of the Mid-Continent Instruments & Avionics MD23 FLEX Custom Function Display (CFD). Mid-Continent Instruments and Avionics - [STC SA1686WE](https://openairdocs.org/stc/SA1686WE): Installation of Vibration Isolation Products (VIP) engine mount P/Ns VIP 50525-1 and VIP 50545-1 on various aircraft as shown on FAA Approved Model List (AML) No. SA1686WE.. FTG, Inc. - [STC SA497GL](https://openairdocs.org/stc/SA497GL): Install Aircraft Wheel and Brake conversion kit 199-80 (MIL-H-5606 system).. Kaman Corporation Aircraft Wheel and Brake LLC - [STC SA1458GL](https://openairdocs.org/stc/SA1458GL): Installation of a Cleveland nose wheel.. Kaman Corporation Aircraft Wheel and Brake LLC - [STC SA01967WI (3 OF3)](https://openairdocs.org/stc/SA01967WI%20(3%20OF3)): Use of GAMI G100UL High Octane Unleaded Avgas. General Aviation Modifications Inc. - [STC SA02203AK](https://openairdocs.org/stc/SA02203AK): Installation of FlightLogic Synthetic Vision Electronic Flight Information System (EFIS-SV).. Genesys Aerosystems Inc. - [STC SA02254AK](https://openairdocs.org/stc/SA02254AK): Installation of "Single Screen", "2 or 3 Screen", "Dual Screen", or "4 or 6 screen". Genesys Aerosystems 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 SA09856AC](https://openairdocs.org/stc/SA09856AC): Installation of BendixKing Aerowave 100 In-flight Data Link System for non-essential, non-required aircraft Cabin Systems & Equipments. Honeywell International Inc (Bendix King) - [STC SA11174SC PAGE 2](https://openairdocs.org/stc/SA11174SC%20PAGE%202): Installation of BendixKing by Honeywell KSN 770 and KSN 765 WAAS LPV approach capable nav/comm systems. Honeywell International Inc (Bendix King) - [STC SA02265SE](https://openairdocs.org/stc/SA02265SE): Installation of a camera housing. Airborne Sensor LLC - [STC ST01930LA](https://openairdocs.org/stc/ST01930LA): Installation of Sandel Avionics SN4500 Electronic Horizontal Situation Indicator (EHSI). Sandel Avionics LLC - [STC SA02075SE](https://openairdocs.org/stc/SA02075SE): Installation of a Mid-Continent MD835( ) Lithium Ion Battery. Mid-Continent Instrument Co. Inc. - [STC SA02426AK](https://openairdocs.org/stc/SA02426AK): Approval of the FreeFlight FDL-978-TX ADS-B system installed. FreeFlight Systems - [STC SA09763DS](https://openairdocs.org/stc/SA09763DS): Installation of an S-TEC 01326 Digital Flight Control System (DFCS). S-TEC Corporation - [STC SA04489NY](https://openairdocs.org/stc/SA04489NY): Installation of Astronics Max-Viz Enhanced Vision System. Air Spray (1967) Ltd - [STC SA10236SC (3 OF 4)](https://openairdocs.org/stc/SA10236SC%20(3%20OF%204)): Installation of a GDC 31 Roll Steering Converter. DAC International Inc - [STC SA02268CH](https://openairdocs.org/stc/SA02268CH): Installation of Airwolf Filter Corp. Air Oil Separator. Airwolf Filter Corporation - [STC SA1009CE](https://openairdocs.org/stc/SA1009CE): ONE ONLY STC, SN # 11138: Installation of King Model KFC 300 Automatic Flight Control System (autopilot and flight director).. Honeywell International Inc - [STC SA1011CE](https://openairdocs.org/stc/SA1011CE): Installation of King Model KVN-395 vertical navigation computer for operation with King Model KFC-300 automatic flight control system.. Honeywell International Inc - [STC SA01452CH](https://openairdocs.org/stc/SA01452CH): Installation of an air ambulance conversion kit.. Med-Pac Inc. - [STC SA01714WI (1 OF 2)](https://openairdocs.org/stc/SA01714WI%20(1%20OF%202)): 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 SA4583SW](https://openairdocs.org/stc/SA4583SW): Installation of an electrically-driven Vapor Cycle, Freon or Refrigerant R-134a, Air Conditioning System. Air Comm Corporation - [STC SA00344BO PAGE 2](https://openairdocs.org/stc/SA00344BO%20PAGE%202): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights.. Whelen Aerospace Technologies - [STC SA615EA](https://openairdocs.org/stc/SA615EA): Installation of a Whelen Anti-Collision Strobe Light System as replacement for originally installed anti-collision lights.. Whelen Aerospace Technologies - [STC SA00098SE](https://openairdocs.org/stc/SA00098SE): Installation of emergency medical stretcher, oxygen, and electrical systems.. LifePort LLC - [STC SA00744DE](https://openairdocs.org/stc/SA00744DE): Installation of the Automatic Dependent Surveillance Broadcast (ADS-B) Out Equipment using a Trig Avionics TT31 Transponder and an approved position sensor. Peregrine All 453: https://openairdocs.org/tcds/2A4/stcs.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.