# N911AN: 1974 Messerschmitt-Boelkow-Blohm-Gm BO-105C - Status: Valid registration - Airframe: [Messerschmitt-Boelkow-Blohm-Gm BO-105C](https://openairdocs.org/model/messerschmitt-boelkow-blohm-gm-bo-105c) (registry code 5626005, 6 seats) - Engine: [Allison 250-C20](https://openairdocs.org/engine/allison-250-c20) (registry code 03080) - Data sheets: [TCDS H3EU](https://openairdocs.org/tcds/H3EU) (Airbus Helicopters Deutschland GmbH (AHD)), [TCDS E4CE](https://openairdocs.org/tcds/E4CE) (Rolls-Royce Corporation) (OpenAirDocs) - Serial number: S-156 - Year built: 1974 - Type: Rotorcraft - Engine type: Turbo-shaft - Airworthiness: Standard, normal - Airworthiness date: July 5, 2018 - Certificate issued: November 4, 2021 - Expires: November 30, 2028 - Mode S code: AC9A6F - Registered owner: [Alaska Tactical Aviation LLC](https://openairdocs.org/faa-owner/ALASKA%20TACTICAL%20AVIATION%20LLC) - Location: [Palmer, AK](https://openairdocs.org/faa-place/AK/Palmer) - Owner type: LLC - Owner's area on the map: 61.6245° N, 148.9817° W: Placed by OpenAirDocs at the center of ZIP code 99645, within about 14 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=911AN - Page: https://openairdocs.org/aircraft/N911AN 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. ## ADs that may apply (OpenAirDocs): 63 in force ### Matched by airframe (Messerschmitt-Boelkow-Blohm-Gm BO-105C) - [AD 2025-25-05](https://openairdocs.org/ad/2025-25-05): Rotorcraft Flight Control · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105S and 6 more. Effective Dec 31, 2025 - [AD 2024-20-07](https://openairdocs.org/ad/2024-20-07): Emergency Equipment; Emergency Flotation Section · Apical Emergency Float Kit, P/N 20498 (STC SR00780LA or 12 others). Effective Dec 5, 2024 - [AD 2023-11-07](https://openairdocs.org/ad/2023-11-07): Ground Proximity System · Airbus Helicopters 47, 206, 210 and 237 more. Effective Jun 22, 2023 - [AD 2023-03-01](https://openairdocs.org/ad/2023-03-01): Main Rotor System · ECD Superlifter Conversion Kit 105-800331 (Eurocopter Deutschland STC SR00043RD). Effective Feb 21, 2023 - [AD 2022-24-07](https://openairdocs.org/ad/2022-24-07): Main Rotor Drive System · ECD Superlifter Conversion Kit 105-800331 (Eurocopter Deutschland STC SR00043RD). Effective Jan 6, 2023 - [AD 2021-13-14](https://openairdocs.org/ad/2021-13-14): Cabin Equipment/Furnishings · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-3 and 1 more. Effective Aug 17, 2021 - [AD 2021-10-21](https://openairdocs.org/ad/2021-10-21): Main Rotor System · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-3 and 9 more. Effective Jul 7, 2021 - [AD 2021-07-08](https://openairdocs.org/ad/2021-07-08): Main Rotor Mast/Swashplate · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 2 more. Effective Apr 30, 2021 - [AD 2021-05-07](https://openairdocs.org/ad/2021-05-07): Electrical Power System Wiring · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105S and 6 more. Effective Apr 16, 2021 - [AD 2017-05-03](https://openairdocs.org/ad/2017-05-03): Main Rotor Blade · Airbus Helicopters Deutschland BO-105C, BO-105LS A-3 and BO-105S. Effective Mar 17, 2017 - [AD 2015-19-14](https://openairdocs.org/ad/2015-19-14): Main Gear Box · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective Nov 3, 2015 - [AD 2013-20-17](https://openairdocs.org/ad/2013-20-17): Turbine Section · Airbus Helicopters Deutschland BO-105C and BO-105S. Effective Dec 13, 2013 - [AD 2013-16-13](https://openairdocs.org/ad/2013-16-13): Tail Rotor Head · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 8 more. Effective Sep 27, 2013 - [AD 2013-16-06](https://openairdocs.org/ad/2013-16-06): Main Rotor Blades · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 2 more. Effective Sep 13, 2013 - [AD 2013-11-15](https://openairdocs.org/ad/2013-11-15): Main Rotor Control · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 14 more. Effective Jul 26, 2013 - [AD 2011-25-01](https://openairdocs.org/ad/2011-25-01): Liferafts · Agusta AB412, AB412 EP, 206A and 23 more. Effective Jan 17, 2012 - [AD 2000-26-01](https://openairdocs.org/ad/2000-26-01): Tension-Torsion (TT) Strap · Airbus Helicopters Deutschland BO-105C. Effective Jan 26, 2001 - [AD 2000-17-08](https://openairdocs.org/ad/2000-17-08): Tension-Torsion (TT) Strap · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 1 more. Effective Oct 2, 2000 - [AD 96-08-04](https://openairdocs.org/ad/96-08-04): Tandem Hydraulic System · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 1 more. Effective May 22, 1996 - [AD 90-23-08](https://openairdocs.org/ad/90-23-08): Continuous Ignition System · Airbus Helicopters Deutschland BO-105C and BO-105S. Effective Dec 3, 1990 - [AD 87-26-02 R1](https://openairdocs.org/ad/87-26-02-R1): Main Rotor Control Rods · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 2 more. Effective Sep 26, 1989 - [AD 87-09-03](https://openairdocs.org/ad/87-09-03): Rotor Blade Bolts · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 6 more. Effective Aug 26, 1988 - [AD 87-19-01](https://openairdocs.org/ad/87-19-01): Stc Sh479gl Labels · Lubrication oil scavenge filter is installed in the existing… (Facet Filter Products STC SH1853SO or 3 others). Effective Dec 18, 1987 - [AD 85-26-02](https://openairdocs.org/ad/85-26-02): Hydraulic Actuator · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective Feb 25, 1986 - [AD 85-08-01](https://openairdocs.org/ad/85-08-01): Vertical Fin Spar And Skins · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective Apr 26, 1985 - [AD 81-03-01](https://openairdocs.org/ad/81-03-01): Drive Shafts · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective Jan 29, 1981 - [AD 80-16-01 R1](https://openairdocs.org/ad/80-16-01-R1): Engine Cowling Assemblies · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective Sep 19, 1980 - [AD 80-10-02](https://openairdocs.org/ad/80-10-02): Tail Rotor System · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective May 1, 1980 - [AD 79-24-06](https://openairdocs.org/ad/79-24-06): Tail Rotor Blades · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective Dec 10, 1979 - [AD 78-19-03](https://openairdocs.org/ad/78-19-03): Safety Belts · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective Oct 18, 1978 - [AD 77-21-07](https://openairdocs.org/ad/77-21-07): Wiring · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Nov 14, 1977 - [AD 77-16-07](https://openairdocs.org/ad/77-16-07): Main Rotor Gearbox · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Sep 6, 1977 - [AD 77-15-01](https://openairdocs.org/ad/77-15-01): Tail Rotor Drive System · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Jul 28, 1977 - [AD 77-11-02](https://openairdocs.org/ad/77-11-02): Main Rotor · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S. Effective Jun 14, 1977 - [AD 77-08-07](https://openairdocs.org/ad/77-08-07): External Load Release · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective May 6, 1977 - [AD 76-26-05](https://openairdocs.org/ad/76-26-05): Rotor Brake · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Jan 6, 1977 - [AD 76-18-10](https://openairdocs.org/ad/76-18-10): Engine mount assembly · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Oct 1, 1976 - [AD 76-18-09](https://openairdocs.org/ad/76-18-09): Main Rotor Actuator · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Oct 1, 1976 - [AD 75-17-27](https://openairdocs.org/ad/75-17-27): Main Rotor Head Assembly · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Aug 20, 1975 - [AD 75-17-13](https://openairdocs.org/ad/75-17-13): Tail Rotor Blade Tip Cap · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Aug 18, 1975 - [AD 84-16-01](https://openairdocs.org/ad/84-16-01): Tail Rotor Blade Inspection · Airbus Helicopters Deutschland BO-105A, BO-105C and BO-105S - [AD 75-14-02](https://openairdocs.org/ad/75-14-02): Rotor Hub Quadruple Nuts · Airbus Helicopters Deutschland BO-105A and BO-105C - [AD 75-14-01](https://openairdocs.org/ad/75-14-01): Hose Assemblies · Airbus Helicopters Deutschland BO-105A and BO-105C ### Matched by engine (Allison 250-C20) - [AD 2022-10-06](https://openairdocs.org/ad/2022-10-06): Turbine Section · Rolls-Royce 250-C20, 250-C20B, 250-C20C (T63-A-720) and 9 more. Effective Jun 28, 2022 - [AD 2018-13-01](https://openairdocs.org/ad/2018-13-01): Turbine Governor · Rolls-Royce 250-C10 (T63-A-5), 250-C18, 250-C18A and 24 more. Effective Aug 16, 2018 - [AD 2006-16-04](https://openairdocs.org/ad/2006-16-04): Inspection of the fuel nozzle screen · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Sep 7, 2006 - [AD 2006-13-06](https://openairdocs.org/ad/2006-13-06): Gas producer rotor assembly tie bolts · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 16 more. Effective Jul 26, 2006 - [AD 2005-10-13](https://openairdocs.org/ad/2005-10-13): Turbine energy absorbing ring · Rolls-Royce 250-B17B, 250-B17C, 250-B17D and 7 more. Effective Jun 22, 2005 - [AD 2004-26-09](https://openairdocs.org/ad/2004-26-09): Compressor Adaptor Couplings · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 8 more. Effective Feb 8, 2005 - [AD 2001-24-12](https://openairdocs.org/ad/2001-24-12): Helical Torquemeter Gearshaft Assembly · Rolls-Royce 250-B17, 250-B17C, 250-B17D and 13 more. Effective Dec 19, 2001 - [AD 98-24-28](https://openairdocs.org/ad/98-24-28): Main Fuel Control Bellows · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 36 more. Effective Jan 7, 1999 - [AD 96-19-01](https://openairdocs.org/ad/96-19-01): Superior Air Parts Manufacture Approval (PMA) Bearings · Rolls-Royce 250-B15G, 250-B17F, 250-B17F/1 and 17 more. Effective Sep 26, 1996 - [AD 88-17-01](https://openairdocs.org/ad/88-17-01): Fuel Controls · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 26 more. Effective Mar 1, 1989 - [AD 83-03-02 R1](https://openairdocs.org/ad/83-03-02-R1): Slotted Third Stage Turbine Wheels · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 5 more. Effective Feb 28, 1984 - [AD 82-24-05](https://openairdocs.org/ad/82-24-05): Control Assembly and Power Turbine Governor Assembly · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 43 more. Effective Nov 26, 1982 - [AD 82-13-03](https://openairdocs.org/ad/82-13-03): Modify Engine High Pressure Fuel Control Filter Assembly · Rolls-Royce 250-C20 and 250-C20B. Effective Jul 1, 1982 - [AD 79-21-01 R1](https://openairdocs.org/ad/79-21-01-R1): Third Stage Turbine Wheel Blade · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 3 more. Effective Jun 3, 1981 - [AD 78-14-08](https://openairdocs.org/ad/78-14-08): Fuel Pump Drive Spline · Rolls-Royce 250-C18, 250-C18A, 250-C18B and 3 more. Effective Oct 24, 1979 - [AD 77-15-12](https://openairdocs.org/ad/77-15-12): Power Turbine Coupling Nut · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 23 more. Effective Sep 23, 1977 - [AD 77-09-08](https://openairdocs.org/ad/77-09-08): Bleed Valve Diaphragm · Rolls-Royce 250-B17, 250-B17B, 250-C20 and 2 more. Effective Jul 18, 1977 - [AD 74-14-03](https://openairdocs.org/ad/74-14-03): Fuel Control Rigging · Rolls-Royce 250-C20. Effective Jul 10, 1974 - [AD 73-19-07](https://openairdocs.org/ad/73-19-07): Turbine Governor-To-Fuel Control Tube · Rolls-Royce 250-C20. Effective Sep 14, 1973 - [AD 72-03-06](https://openairdocs.org/ad/72-03-06): Turbine Wheels · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 9 more. Effective Feb 8, 1972 ### Historical (superseded or no longer in force) - [AD 2021-23-13](https://openairdocs.org/ad/2021-23-13) (historical): Ground Proximity System · Airbus Helicopters K-225, K-190A, K-240 and 237 more. Effective Dec 9, 2021 - [AD 2021-10-14](https://openairdocs.org/ad/2021-10-14) (historical): Main Rotor System · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-3 and 1 more. Effective Jun 24, 2021 - [AD 2019-07-07](https://openairdocs.org/ad/2019-07-07) (historical): Main Rotor System · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-3 and 9 more. Effective May 24, 2019 - [AD 2002-13-06](https://openairdocs.org/ad/2002-13-06) (historical): Tension-torsion (T-T) straps · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 1 more. Effective Jul 15, 2002 - [AD 99-24-05](https://openairdocs.org/ad/99-24-05) (historical): Tension Torsion (TT) Strap · Eurocopter Deutschland BO-105C. Effective Dec 3, 1999 - [AD 99-19-22](https://openairdocs.org/ad/99-19-22) (historical): TT Strap · Eurocopter Deutschland BO-105A, BO-105C, BO-105LS A-1 and 1 more. Effective Oct 25, 1999 - [AD 97-26-02](https://openairdocs.org/ad/97-26-02) (historical): Main Rotor Mast Flange Crack Inspection · Airbus Helicopters Deutschland BO-105A, BO-105C, BO-105LS A-1 and 2 more. Effective Dec 31, 1997 - [AD 77-04-06](https://openairdocs.org/ad/77-04-06) (historical): Main Rotor Gearbox · Airbus Helicopters Deutschland BO-105A and BO-105C. Effective Aug 23, 1979 - [AD 2017-18-14](https://openairdocs.org/ad/2017-18-14) (historical): Turbine Section · Rolls-Royce 250-C20, 250-C20B, 250-C20F and 8 more. Effective Oct 13, 2017 - [AD 2015-02-22](https://openairdocs.org/ad/2015-02-22) (historical): Repetitive visual inspections · Rolls-Royce 250-B17, 250-B17B, 250-B17C and 15 more. Effective Mar 9, 2015 - [AD 2012-14-06](https://openairdocs.org/ad/2012-14-06) (historical): Released turbine blades and shrouds · Rolls-Royce 250-C20, 250-C20B and 250-C20R/2. Effective Aug 14, 2012 - [AD 2004-24-09](https://openairdocs.org/ad/2004-24-09) (historical): Fuel nozzle · Rolls-Royce 250-B15A, 250-B15E, 250-B15G and 40 more. Effective Jan 5, 2005 - [AD 2001-20-51](https://openairdocs.org/ad/2001-20-51) (historical): Helical Torquemeter Gearshaft Assembly · 250-B17, 250-B17C, 250-B17D and 12 more ## Information bulletins (advisory) (2 in force) - [SAIB SW-08-42](https://openairdocs.org/saib/SW-08-42): Emergency Float with Liferaft Kits (kits). Issued Aug 27, 2008 - [SAIB CE-01-10](https://openairdocs.org/saib/CE-01-10): . Issued Jan 24, 2001 ## NTSB investigations None matched to N911AN. ## FAA accident and incident reports None matched to N911AN. ## 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) (88, 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 (Messerschmitt-Boelkow-Blohm-Gm BO-105C) - [STC SR00643SE](https://openairdocs.org/stc/SR00643SE): Installation of Geneva Aviation Video System. Turbolyft USA Corporation - [STC SR02301SE](https://openairdocs.org/stc/SR02301SE): Installation of Geneva Aviation 28 - 14 VDC Power Converter. AEM USA Inc - [STC SH3319NM](https://openairdocs.org/stc/SH3319NM): Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system,. Precise Flight Inc - [STC SR00119BO](https://openairdocs.org/stc/SR00119BO): Installation of a Newcomb Communications, Inc. CP-2 Satcom System in accordance with Newcomb Communications, Inc., Master Document List No. D000-0058, Revision B, dated April 12, 2000, or later FAA-approved revision. Outerlink Corporation - [STC SR02704SE](https://openairdocs.org/stc/SR02704SE): Installation and maintenance of the Sunspot 36 and 46 series lights. AeroLED's Holdings LLC - [STC SR00359BO](https://openairdocs.org/stc/SR00359BO): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. Whelen Aerospace Technologies - [STC SR00910SE](https://openairdocs.org/stc/SR00910SE): Replacement of the original landing gear skid tubes with DART Model D105-674-011 skid tubes. Dart Aerospace USA Inc - [STC SH2679SW](https://openairdocs.org/stc/SH2679SW): Modification for IFR Type of operation. Associated Air Center, Inc. - c/o CT Corporation System - [STC SR02487AK](https://openairdocs.org/stc/SR02487AK): Installation of L-3 Communications Avionics Systems ESI-500 Standby Instrument System. ADS-B Technologies, LLC - [STC SR02475AK](https://openairdocs.org/stc/SR02475AK): Installation of the Lexavia Integrated Systems LFS3500 Enhanced Vision System (EVS) on Part 27 Airbus Helicopters equipped with a panel-mounted Multi-Function Display (MFD), primary navigational display or dedicated display with the ability to display video imagery. Lexavia Integrated Systems - [STC SR02470AK](https://openairdocs.org/stc/SR02470AK): Installation of the L-3 Communications NGT -1000/2000/2500 ADS-B System. ADS-B Technologies, LLC - [STC SR02471AK](https://openairdocs.org/stc/SR02471AK): Installation of the L-3 Communications NGT -9000/9000R ADS-B System. ADS-B Technologies, LLC - [STC SR02394AK](https://openairdocs.org/stc/SR02394AK): Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system. Seaplanes North LLC - [STC SH7685SW](https://openairdocs.org/stc/SH7685SW): Replacement of the MBB oil cooler fairing, MBB P/N 105-61802. Apical Industries, Inc. dba Dart Aerospace - [STC SH8977SW](https://openairdocs.org/stc/SH8977SW): Installation of Parker Hannifan Airborne fuel pump. Apical Industries, Inc. dba Dart Aerospace - [STC SR00856LA](https://openairdocs.org/stc/SR00856LA): Installation of Apical emergency float kit, p/n 20430. Apical Industries, Inc. dba Dart Aerospace - [STC SR01546SE](https://openairdocs.org/stc/SR01546SE): Installation of a Supplemental Lighting System. Aviation Specialties Unlimited Inc - [STC SH8417SW](https://openairdocs.org/stc/SH8417SW): Installation of Benz Part Number PCS-111A Continuity Sensor in the engine, tail rotor gearbox, intermediate gearbox, and main transmission chip detectors. Meggitt, Orange County, Inc - [STC SH1770SO](https://openairdocs.org/stc/SH1770SO): Installation of a controllable belly-mounted searchlight. Bell Helicopter Textron Inc - [STC SR03027CH](https://openairdocs.org/stc/SR03027CH): Installation of Air Ambulance Unit in accordance with Ocean Air Master Data List, Report AC-BO105, Revision Original, Dated February 1st 2011 or later FAA Approved Revision. Ocean Air Aviation - [STC SR01802AT](https://openairdocs.org/stc/SR01802AT): Manufacture of Replacements Windows and Windshields in accordance with Aeronautical Accessories, Inc. Drawing List Report No. AA-98155, no revision, dated October 21, 1998, or later FAA approved revisions, and installation per Installation Instructions listed in that report. Bell Helicopter Textron Inc - [STC SH308NE](https://openairdocs.org/stc/SH308NE): Replace existing starter-generators and install Aicraft Parts Corp. starter-generators. Shurka Aerospace Inc - [STC SR00169BO](https://openairdocs.org/stc/SR00169BO): Installation of Altair Avionics Corporation SmartCycle monitoring and recording system. Pratt & Whitney Engine Services Inc - [STC SH7893SW](https://openairdocs.org/stc/SH7893SW): Installation of shoulder harnesses to the aft three passenger seats. Apical Industries Inc - [STC SR01178SE](https://openairdocs.org/stc/SR01178SE): Fabrication and installation of Infrared Camera, Video Cassette recorder and additional cross tube mounted landing lights for model BO-105CBS-4, serial number S-430. Portland General Electric - [STC SH752GL](https://openairdocs.org/stc/SH752GL): Installation of a fuel flow indicating system. Shadin Avionics - [STC SR00811NY](https://openairdocs.org/stc/SR00811NY): Installation of Technisonic Industries Limited TFM-138 series transceiver models. Technisonic Industries Limited - [STC SR01834NY](https://openairdocs.org/stc/SR01834NY): Installation of Globalstar Satellite Telephone System. Atlantic Avionics Inc - [STC SH1031EA-D](https://openairdocs.org/stc/SH1031EA-D): Installation of Airesearch Manufacturing environmental control unit. Approval is also eligible with the modification approved under STC SH1025EA issued 11/24/1975 or latest FAA approved revision. American Eurocopter Corporation - [STC SH1073EA-D](https://openairdocs.org/stc/SH1073EA-D): Installation of Electric Chip Detectors in main transmission and intermediate and tail rotor gear boxes. American Eurocopter Corporation - [STC SH1260EA-D](https://openairdocs.org/stc/SH1260EA-D): Installation of Pulsed Chip Detector System. American Eurocopter Corporation - [STC SH218NW-D](https://openairdocs.org/stc/SH218NW-D): Installation and maintenance of Allison 250-C20 engine equipped with Bendix fuel control system. American Eurocopter Corporation - [STC SH408NE-D](https://openairdocs.org/stc/SH408NE-D): Replacement of auxiliary fuel boost pumps with Parker Hannifin-Airborne centrifugal boost pumps. American Eurocopter Corporation - [STC SH427NE-D](https://openairdocs.org/stc/SH427NE-D): Incorporation of Boarding Step Installation. American Eurocopter Corporation - [STC SH506NE-D](https://openairdocs.org/stc/SH506NE-D): Incorporation of cargo gas springs. American Eurocopter Corporation - [STC SH8175SW-D](https://openairdocs.org/stc/SH8175SW-D): Installation of cross tube mounted external loud hailer speakers. American Eurocopter Corporation - [STC SH82NE-D](https://openairdocs.org/stc/SH82NE-D): Installation of differential fuel pressure switch. Also compatible with BO-105C as modified by Carson Helicopters' STC SH1025EA. American Eurocopter Corporation - [STC SH8786SW-D](https://openairdocs.org/stc/SH8786SW-D): Installation of Strobe Anticollision light system. American Eurocopter Corporation - [STC SH920NE-D](https://openairdocs.org/stc/SH920NE-D): Installation of Main Fuel Tank Pump Switch off Advisory Light System. American Eurocopter Corporation - [STC SH971EA-D](https://openairdocs.org/stc/SH971EA-D): Installation of cabin door post and door latching mechanism modification kit. American Eurocopter Corporation - [STC SH999EA-D](https://openairdocs.org/stc/SH999EA-D): Installation of engine bleed air heating system. Limited to installation on serial number S-156 ONLY. American Eurocopter Corporation - [STC SR00611AT](https://openairdocs.org/stc/SR00611AT): 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. Enviro Systems Inc - [STC SH1212EA](https://openairdocs.org/stc/SH1212EA): Installation of Casey shroud heater. Tradewind Turbines - [STC SH201WE](https://openairdocs.org/stc/SH201WE): Installation of stirrup assemblies to directional control pedals for operation by handicapped pilot. (US ARMY OH-13E 205A). Dallwig Barry C - [STC SR01265NY](https://openairdocs.org/stc/SR01265NY): Bearpaw installation. Dart Aerospace Limited - [STC SA2629NM](https://openairdocs.org/stc/SA2629NM): Installation of a retractable antenna mechanism and UHF or microwave antenna on right hand skid. AAR Aircraft Services Inc - [STC SH7646SW](https://openairdocs.org/stc/SH7646SW): Installation of an engine compressor water wash system. Omniflight Helicopters, Inc - [STC SH589NE](https://openairdocs.org/stc/SH589NE): Installation of wire strike protection system. (BO-105C VARIANTS CB-2 CB-2) (BO-105S VARIANTS CBS-2 CBS-4). Eurocopter Canada Limited - [STC SR09149RC](https://openairdocs.org/stc/SR09149RC): Installation of the RDA 3303 Airborne Vibration Monitoring System. Rotor Dynamics Americas - [STC SR00269LA](https://openairdocs.org/stc/SR00269LA): Installation of emergency ditching floats. Apical Industries Inc All 88: https://openairdocs.org/aircraft/N911AN/stcs.md ## Related - Other Messerschmitt-Boelkow-Blohm-Gm BO-105C aircraft: https://openairdocs.org/model/messerschmitt-boelkow-blohm-gm-bo-105c/aircraft.md - The Allison 250-C20 engine: https://openairdocs.org/engine/allison-250-c20.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.