The STC search system is a complimentary service provided to the aviation community. We hope you find it useful. Our primary product is a comprehensive library of aviation regulations and standards, including tools for generating Airworthiness Directive compliance reports.

No. of STCs: 17

STC Holder: Enviro Systems Inc. 12037 S. Highway 99, Seminole, OK 74868		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA01977WI	Status: Historical	App Date: 12/19/2019	Rev Date: 11/04/2022
Description: Installation of the Enviro Systems Inc. Environmental Control System Upgrade
TC Nos.: A24CE
Models: Textron Aviation Inc.B300, B300C
ACO: AIR-760: Central Certification Branch FTW

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA206RM	Status: Current	App Date: 07/01/1980	Rev Date: 06/20/2003
Description: Installation of headliner and duct system in accordance with Aero Engineering Corporation Drawing List No. DL-4, Revision D or later FAA approved revision.
TC Nos.: A7PC
Models: AeroSpace Technologies Of Australia Pty Ltd.N24A
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA2294SO	Status: Current	App Date: 09/09/1987	Rev Date: 06/20/2003
Description: Installation of seat access panel in accordance with ALM Technologies, Inc., Drawing List, Document No. 3698001, dated August 21, 1987, or later FAA approved revision.
TC Nos.: H3WE
Models: MD Helicopter Inc.369, 369A, 369D, 369E, 369F, 369FF, 369H, 369HE, 369HM, 369HS
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SA935SW	Status: Current	App Date: 05/22/1967	Rev Date: 06/20/2003
Description: Installation of cabin air conditioning system in accordance with Installation Instructions dated August 30, 1968, for Cessna Models 182, 182A, 182B; and Engineering Report 6496227 dated May 1, 1970 for Cessna Models 182E, 182F, 182G, 182H, 182J, 182K, 182L, 182M..
TC Nos.: 3A13
Models: The Cessna Aircraft Company182, 182A, 182B, 182E, 182F, 182G, 182H, 182J, 182K, 182L, 182M
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH1528NM	Status: Current	App Date: 10/11/1982	Rev Date: 06/20/2003
Description: Installation of Freon Compressor Air Conditioning System in accordance with Aero Engineering Corporation Drawing List, DL-9, FAA approval dated November 26, 1982, or later FAA approved revision.
TC Nos.: H3WE
Models: MD Helicopter Inc.369D, 369E, 369H
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH1705SO	Status: Current	App Date: 02/13/1984	Rev Date: 06/20/2003
Description: Installation of Freon Air Conditioning System in accordance with Installation Drawing List Report No. DL-30-1, Revision B, dated November 5, 1984 and Manufacturing Drawing List, Report No. DL-30-2, Revision A, dated November 19, 1984, or later FAA approved revisions.
TC Nos.: H12EU
Models: Westland Helicopters LimitedWestland 30 Series 100
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH189RM	Status: Current	App Date: 06/08/1979	Rev Date: 06/20/2003
Description: Installation of belt driven air conditioner system in accordance with FAA sealed Aero Engineering Corporation Drawing List No. DL-2, dated October 24, 1979, and/or Drawing List No. DL-2-1, dated April 19, 1982, or subsequent FAA approved revision.
TC Nos.: H9EU
Models: Eurocopter FranceAS-350B, AS-350B1, AS-350B2, AS-350BA, AS-350C, AS-350D, AS-350D1
ACO: AIR-760: Central Certification Branch FTW

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH2720SO	Status: Current	App Date: 02/14/1989	Rev Date: 06/20/2003
Description: Installation of Aero Aire Model 234 Environmental Control System (ECS) in accordance with Aero Aire Master Drawing List Document No. A234R002, Revision B, dated March 7, 1990, or later FAA Approved Revision.
TC Nos.: H9EA
Models: Boeing Defense & Space Group234
ACO: AIR-760: Central Certification Branch FTW

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH3301SO	Status: Historical	App Date: 08/07/1991	Rev Date: 06/20/2003
Description: Installation of a Freon Air Conditioning System in accordance with Aero Aire Corporation Master Drawing List No. 500R010, Rev. 2, dated 5/26/1992, or later FAA approved revision.
TC Nos.: H3WE
Models: MD Helicopter Inc.369E, 500N
ACO: AIR-7A0: Atlanta ACO Branch

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH3301SO	Status: Current	App Date: 08/07/1991	Rev Date: 06/20/2003
Description: Installation of a Freon Air Conditioning System in accordance with Aero Aire Corporation Master Drawing List No. 500R010, Rev. 2, dated 5/26/1992, or later FAA approved revision.
TC Nos.: H3WE
Models: MD Helicopter Inc.369E, 500N
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH4629SW	Status: Current	App Date: 02/19/1981	Rev Date: 06/20/2003
Description: Installation of Freon air conditioning system in accordance with Drawing List Report No. DL-7, Revision A, dated March 8, 1982; or Drawing List DL-7-1, dated July 7, 1982; or optional forward evaporator in accordance with Drawing List Report No. DL-7-3, Revision A, dated March 1, 1983; or later FAA Approved Revisions.
TC Nos.: H11EU
Models: Eurocopter FranceAS355E, AS355F, AS355F1, AS355F2, AS355N
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH4635SW	Status: Current	App Date: 08/03/1981	Rev Date: 06/20/2003
Description: Belt driven Freon Air Conditioning System in accordance with Drawing List DL8-1, Revision A, dated September 24, 1982, for Models 206A and 206B; or Drawing List DL-8-15, Revision A, dated September 24, 1982, for Model 206L-1; or later FAA Approved revisions. Drawing List DL-8-1, Revision B, dated November 11, 1982, for Models 206A and 206B; Drawing List DL-8-15 Revision B, date November 11, 1982, are required for installation of Casey Shroud Heater in conjunction with air conditioner.
TC Nos.: H2SW
Models: Bell Helicopter Textron (Canada)206A, 206B, 206L, 206L-1, 206L-3
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SH4680SW	Status: Current	App Date: 02/19/1981	Rev Date: 06/20/2003
Description: Installation of Freon air conditioning system in accordance with Drawing List Report No. DL-5, Revision C, dated April 1, 1983, or later FAA approved revision.
TC Nos.: H1NE
Models: Sikorsky Aircraft CorporationS-76A
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SR00611AT	Status: Current	App Date: 01/19/1994	Rev Date: 06/20/2003
Description: Installation of an air conditioning system in accordance with Aero Aire Corporation Master Drawing List 1054RO10,Revision. 2, dated November 3, 1994, or later FAA approved revision.
TC Nos.: H3EU, H6NE
Models: Eurocopter Canada LimitedBO 105 LS A-3 Eurocopter Deutschland GmbHBO-105C
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SR02341AT	Status: Current	App Date: 02/01/2001	Rev Date: 06/20/2003
Description: Installation of an Aero Aire Corporation vapor cycle air conditioning system.
TC Nos.: R0001RD
Models: Eurocopter FranceEC120B
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SR02434AT	Status: Current	App Date: 05/09/2001	Rev Date: 06/20/2003
Description: Installation of an Aero Aire Corporation Vapor Cycle Air Conditioning System per Aero Aire Master Drawing List 44TA000-IR015, Rev. C, dated 11/30/2001, or later FAA approved revision.
TC Nos.: H11NM
Models: Robinson Helicopter CompanyR44
ACO: AIR-750: East Certification Branch ATL

STC Holder: Enviro Systems Inc. 4000 Hwy. 99 N., Seminole, OK 74868, United States		If you are an STC Holder, Contact us to have your company added here!
STC No.: SR09117RC-D	Status: Current	App Date: 06/21/1999	Rev Date: 06/20/2003
Description: Installation of an Aero Aire, Air Conditioner System, with Forward Evaporator
TC Nos.: H9EU
Models: Eurocopter FranceAS-350B, AS-350B1, AS-350B2, AS-350B3, AS-350BA, AS-350D
ACO: AIR-760: Central Certification Branch FTW