# N212TP: 1971 Bell 212 - Status: Valid registration - Airframe: [Bell 212](https://openairdocs.org/model/bell-212) (registry code 1181420, 15 seats) - Engine: [Pratt & Whitney T400-CP-400](https://openairdocs.org/engine/pratt-whitney-t400-cp-400) (registry code 52123) - Data sheets: [TCDS H4SW](https://openairdocs.org/tcds/H4SW) (Bell Textron Inc.) (OpenAirDocs) - Serial number: 32003 - Year built: 1971 - Type: Rotorcraft - Engine type: Turbo-shaft - Airworthiness: Experimental, research and development - Airworthiness date: June 22, 2018 - Certificate issued: January 28, 1998 - Expires: April 30, 2029 - Mode S code: A1C2A7 - Registered owner: [National Test Pilot School](https://openairdocs.org/faa-owner/NATIONAL%20TEST%20PILOT%20SCHOOL) - Location: [Mojave, CA](https://openairdocs.org/faa-place/CA/Mojave) - Owner type: Corporation - Owner's area on the map: 35.0658° N, 118.2218° W: Placed by OpenAirDocs at the center of ZIP code 93501, within about 8 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based - FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=212TP - Page: https://openairdocs.org/aircraft/N212TP From the FAA registry file of October 22, 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): 64 in force ### Matched by airframe (Bell 212) - [AD 2025-07-01](https://openairdocs.org/ad/2025-07-01): Air Data Computer · Synthetic Vision Electronic Flight Information System (Arrow STC SR09595RC or ST01523WI). Effective May 15, 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 2024-16-19](https://openairdocs.org/ad/2024-16-19): Rotorcraft Tail Boom · Bell Textron 212, 412CF, 412 and 1 more. Effective Nov 8, 2024 - [AD 2024-19-17](https://openairdocs.org/ad/2024-19-17): Rotorcraft flight control · Airwolf Aerospace, LLC Tension-Torsion Strap Assemblies, P/N… (STC SR03408CH). Effective Oct 11, 2024 - [AD 2024-16-01](https://openairdocs.org/ad/2024-16-01): Fuselage structure · Bell Textron 205A, 205A-1, 205B and 4 more. Effective Sep 4, 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 2022-20-14](https://openairdocs.org/ad/2022-20-14): Main Rotor Gearbox · Bell Textron 204B, 205A, 205A-1 and 20 more. Effective Dec 27, 2022 - [AD 2022-22-12](https://openairdocs.org/ad/2022-22-12): Nose/Tail Landing Gear Structure/Axle · Replacement crosstubes P/N D212-664 (Dart Aerospace STC SR01298NY). Effective Nov 22, 2022 - [AD 2022-11-19](https://openairdocs.org/ad/2022-11-19): Aircraft Fuel System, Engine Oil System (Airframe) · Bell Textron 212, 412, 412CF and 1 more. Effective Jul 6, 2022 - [AD 2022-07-02](https://openairdocs.org/ad/2022-07-02): Rotorcraft Tail Boom · Bell Textron 205A, 205A-1, 205B and 5 more. Effective May 9, 2022 - [AD 2022-05-10](https://openairdocs.org/ad/2022-05-10): Cabin Equipment/Furnishings · Airbus Helicopters AS332L, AS332L1, AS332L2 and 57 more. Effective Apr 20, 2022 - [AD 2022-06-03](https://openairdocs.org/ad/2022-06-03): Main Rotor System · Bell Textron 204B, 205A, 205A-1 and 3 more. Effective Mar 16, 2022 - [AD 2020-19-08](https://openairdocs.org/ad/2020-19-08): Main Rotor · Bell Textron 204B, 205A-1 and 212. Effective Oct 21, 2020 - [AD 2020-16-10](https://openairdocs.org/ad/2020-16-10): Cabin Equipment/Furnishings · Bell Textron 204B, 205A, 205A-1 and 7 more. Effective Sep 3, 2020 - [AD 2020-12-10](https://openairdocs.org/ad/2020-12-10): Tail Rotor Blades · Bell Textron 205A, 205A-1, 205B and 4 more. Effective Jul 16, 2020 - [AD 2019-09-02](https://openairdocs.org/ad/2019-09-02): 7900 Engine Oil System and 2800 Aircraft Fuel System · Bell Helicopter Textron 212, 412, 412CF and 1 more. Effective Jun 4, 2019 - [AD 2018-16-14](https://openairdocs.org/ad/2018-16-14): Emergency Flotation Section · Bell Helicopter Textron 212, 412 and 412EP. Effective Oct 4, 2018 - [AD 2015-15-04](https://openairdocs.org/ad/2015-15-04): Main Rotor Blade Grip · Bell Helicopter Textron 204B, 205A, 205A-1 and 1 more. Effective Aug 7, 2015 - [AD 2014-12-04](https://openairdocs.org/ad/2014-12-04): Main Rotor Head · Bell Helicopter Textron 204B, 205A, 205A-1 and 3 more. Effective Jul 24, 2014 - [AD 2013-15-02](https://openairdocs.org/ad/2013-15-02): Tail Rotor Blades · Bell Helicopter Textron 205A, 205A-1, 205B and 5 more. Effective Aug 14, 2013 - [AD 2013-06-51](https://openairdocs.org/ad/2013-06-51): Equipment/Furnishings · Agusta A109, A109A, A109A II and 43 more. Effective Jul 15, 2013 - [AD 2013-03-16](https://openairdocs.org/ad/2013-03-16): Main Rotor Head · Bell Helicopter Textron 204B, 205A, 205A-1 and 3 more. Effective Feb 27, 2013 - [AD 2012-17-08](https://openairdocs.org/ad/2012-17-08): Main Rotor Head · Bell Helicopter Textron 204B, 205A, 205A-1 and 2 more. Effective Feb 27, 2013 - [AD 2012-22-06](https://openairdocs.org/ad/2012-22-06): High Landing Gear Forward Crosstube Assembly · Aeronautical Accessories AB412, AB412 EP, 205A and 7 more. Effective Dec 14, 2012 - [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 2011-23-02](https://openairdocs.org/ad/2011-23-02): Main rotor blade (blade) assemblies · Bell Helicopter Textron 205A-1, 205B, 210 and 1 more. Effective Nov 21, 2011 - [AD 2010-26-52](https://openairdocs.org/ad/2010-26-52): Tail Rotor Blade · Bell Helicopter Textron 204B, 205A, 205A-1 and 6 more. Effective Nov 15, 2011 - [AD 2010-10-16](https://openairdocs.org/ad/2010-10-16): Crosstube · Agusta AB412, AB412 EP, 205A and 6 more. Effective Jun 8, 2010 - [AD 2007-22-02](https://openairdocs.org/ad/2007-22-02): Tail rotor blade (blade) forward tip weight retention block (tip block) and the aft tip closure (tip closure) · Bell Helicopter Textron 205A, 205A-1, 205B and 4 more. Effective Nov 30, 2007 - [AD 2005-20-38](https://openairdocs.org/ad/2005-20-38): Reservoir assembly adapter (adapter) · Bell Helicopter Textron 212, 412 and 412EP with STC SH2820SO. Effective Oct 28, 2005 - [AD 2002-22-14](https://openairdocs.org/ad/2002-22-14): Main rotor tension-torsion (TT) straps · Bell Helicopter Textron 204B, 205A, 205A-1 and 4 more. Effective Dec 13, 2002 - [AD 2002-19-05](https://openairdocs.org/ad/2002-19-05): Tail boom · Bell Helicopter Textron 212. Effective Oct 30, 2002 - [AD 2001-13-01](https://openairdocs.org/ad/2001-13-01): Tail Rotor Counterweight Bellcrank (bellcrank) Retention Nut (retention nut) · Bell Helicopter Textron 205A-1, 205B, 212 and 3 more. Effective Aug 1, 2001 - [AD 2001-08-04](https://openairdocs.org/ad/2001-08-04): Main Rotor Actuator · Bell Helicopter Textron 205A-1, 205B, 212 and 3 more. Effective May 3, 2001 - [AD 2000-15-52](https://openairdocs.org/ad/2000-15-52): Mast and main rotor trunnions · Bell Helicopter Textron 204B, 205A, 205A-1 and 2 more. Effective Dec 28, 2000 - [AD 98-11-15](https://openairdocs.org/ad/98-11-15): Tail Rotor Yoke Assembly · Bell Helicopter Textron 212. Effective Feb 10, 1999 - [AD 94-18-09](https://openairdocs.org/ad/94-18-09): Main Transmission Lower Planetary Spider · Bell Helicopter Textron 205A, 205A-1, 205B and 2 more. Effective Oct 14, 1994 - [AD 93-17-12](https://openairdocs.org/ad/93-17-12): Main Rotor Transmission Lower Planetary Spider · Bell Helicopter Textron 204B, 205A, 205A-1 and 3 more. Effective Jul 29, 1994 - [AD 92-23-01](https://openairdocs.org/ad/92-23-01): Main Rotor Pillow Blocks · Bell Helicopter Textron 204B, 205A, 205A-1 and 10 more. Effective Apr 23, 1993 - [AD 92-13-10](https://openairdocs.org/ad/92-13-10): Tail Rotor Driveshaft Hanger Bearing · Bell Helicopter Textron 204B, 205A, 205A-1 and 3 more. Effective Feb 23, 1993 - [AD 92-09-05](https://openairdocs.org/ad/92-09-05): Torque Adapter · Bell Helicopter Textron 212 and 412. Effective Jun 2, 1992 - [AD 92-07-08](https://openairdocs.org/ad/92-07-08): Swashplate Support Assembly · Bell Helicopter Textron 204B, 205A, 205A-1 and 2 more. Effective Mar 25, 1992 - [AD 90-26-11](https://openairdocs.org/ad/90-26-11): Drag Brace Assemblies · Bell Helicopter Textron 212. Effective Jan 18, 1991 - [AD 90-03-09](https://openairdocs.org/ad/90-03-09): T/R Hub Assembly (See 90-03-09) · Bell Helicopter Textron 205A, 205A-1, 212 and 1 more. Effective Feb 13, 1990 - [AD 89-08-05](https://openairdocs.org/ad/89-08-05): Transmission Internal Sump Oil Filter · Bell Helicopter Textron 204B, 205A, 205A-1 and 2 more. Effective Jan 3, 1990 - [AD 81-10-07](https://openairdocs.org/ad/81-10-07): Swashplate Support · Bell Helicopter Textron 212. Effective May 14, 1981 - [AD 80-21-05](https://openairdocs.org/ad/80-21-05): Landing Gear Cross Tubes · Bell Helicopter Textron 205A-1 and 212. Effective Oct 15, 1980 - [AD 79-05-08](https://openairdocs.org/ad/79-05-08): Emergency Flotation (Ditching) Equipment · Bell Helicopter Textron 212. Effective Apr 16, 1979 - [AD 78-17-03](https://openairdocs.org/ad/78-17-03): Spiral Bevel Gear · Bell Helicopter Textron 212. Effective Nov 22, 1978 - [AD 78-20-07](https://openairdocs.org/ad/78-20-07): Shoulder Radius Fitting · Bell Helicopter Textron 204B, 205A-1 and 212. Effective Oct 25, 1978 ### Matched by engine (Pratt & Whitney T400-CP-400) None in force. ### Historical (superseded or no longer in force) - [AD 2022-02-02](https://openairdocs.org/ad/2022-02-02) (historical): Main Rotor System · Bell Textron 204B, 205A, 205A-1 and 3 more. Effective Feb 16, 2022 - [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 2021-15-51](https://openairdocs.org/ad/2021-15-51) (historical): Main rotor system · Bell Textron 204B, 205A, 205A-1 and 2 more. Effective Aug 24, 2021 - [AD 2018-17-01](https://openairdocs.org/ad/2018-17-01) (historical): Engine Oil System and Aircraft Fuel System · Bell Helicopter Textron 212, 412, 412CF and 1 more. Effective Sep 5, 2018 - [AD 2017-15-02](https://openairdocs.org/ad/2017-15-02) (historical): Engine Oil System and Aircraft Fuel System · Bell Helicopter Textron 212 and 412. Effective Aug 4, 2017 - [AD 2011-12-08](https://openairdocs.org/ad/2011-12-08) (historical): Tail rotor (T/R) blades · Bell Helicopter Textron 205A, 205A-1, 205B and 4 more. Effective Jul 5, 2011 - [AD 2011-08-01](https://openairdocs.org/ad/2011-08-01) (historical): Main rotor hub · Bell Helicopter Textron 212. Effective Apr 21, 2011 - [AD 2010-25-51](https://openairdocs.org/ad/2010-25-51) (historical): Main Rotor Hub · Bell Helicopter Textron 212 - [AD 2010-24-52](https://openairdocs.org/ad/2010-24-52) (historical): Cracked fitting · Bell Helicopter Textron 212 - [AD 2010-24-51](https://openairdocs.org/ad/2010-24-51) (historical): Cracked fitting · Bell Helicopter Textron 212 - [AD 2010-03-03](https://openairdocs.org/ad/2010-03-03) (historical): Main rotor blade · Bell Helicopter Textron 205B and 212. Effective Feb 19, 2010 - [AD 2008-10-03](https://openairdocs.org/ad/2008-10-03) (historical): Tail rotor blade assembly · Bell Helicopter Textron 204B, 205A, 205A-1 and 6 more. Effective May 21, 2008 - [AD 2007-19-53](https://openairdocs.org/ad/2007-19-53) (historical): Tail rotor blade (blade) · Bell Helicopter Textron 204B, 205A, 205A-1 and 6 more. Effective Dec 5, 2007 - [AD 2003-01-04](https://openairdocs.org/ad/2003-01-04) (historical): Main rotor grip · New rotor blades (Hillsboro STC SH5132NM). Effective Jan 30, 2003 - [AD 2002-09-04](https://openairdocs.org/ad/2002-09-04) (historical): Tip Block and Tip Closure · Bell Helicopter Textron 205A, 205A-1, 205B and 4 more. Effective Jun 7, 2002 - [AD 2000-25-03](https://openairdocs.org/ad/2000-25-03) (historical): Main Rotor Actuator Locking Washer · Bell Helicopter Textron 205A-1, 205B, 212 and 2 more. Effective Dec 28, 2000 - [AD 2000-08-52](https://openairdocs.org/ad/2000-08-52) (historical): Main Rotor System · Bell Helicopter Textron 204B, 205A, 205A-1 and 2 more - [AD 98-24-15](https://openairdocs.org/ad/98-24-15) (historical): Main Rotor Mast and Trunnion · Bell Helicopter Textron 204B, 205A, 205A-1 and 2 more. Effective Dec 8, 1998 - [AD 93-05-01](https://openairdocs.org/ad/93-05-01) (historical): Main Rotor Yoke Assembly · Bell Helicopter Textron 212. Effective Apr 19, 1993 - [AD 81-19-01](https://openairdocs.org/ad/81-19-01) (historical): Main Rotor Yoke · Bell Helicopter Textron 212. Effective Sep 30, 1981 - [AD 80-17-09](https://openairdocs.org/ad/80-17-09) (historical): Main Rotor Straps · Bell Helicopter Textron 204B, 205A-1, 212 and 16 more. Effective Sep 15, 1980 - [AD 79-20-05](https://openairdocs.org/ad/79-20-05) (historical): Main Rotor Hub Assembly · Bell Helicopter Textron 204B, 205A-1 and 212. Effective Jan 18, 1980 - [AD 75-26-05](https://openairdocs.org/ad/75-26-05) (historical): Main Rotor Blades · Bell Helicopter Textron 204B, 205A-1 and 212. Effective Jan 19, 1976 - [AD 74-08-03](https://openairdocs.org/ad/74-08-03) (historical): Tail Fin Forward Spar Cap Angle · Bell Helicopter Textron 212. Effective May 6, 1974 All 88: https://openairdocs.org/aircraft/N212TP/ads.md ## Information bulletins (advisory) (5 in force) - [SAIB SW-12-38](https://openairdocs.org/saib/SW-12-38): Emergency Push Out Window Retention. Issued Jul 30, 2012 - [SAIB SW-08-42](https://openairdocs.org/saib/SW-08-42): Emergency Float with Liferaft Kits (kits). Issued Aug 27, 2008 - [SAIB SW-05-79](https://openairdocs.org/saib/SW-05-79): . Issued Aug 8, 2005 - [SAIB SW-05-47](https://openairdocs.org/saib/SW-05-47): . Issued Apr 5, 2005 - [SAIB SW-05-10R1](https://openairdocs.org/saib/SW-05-10R1): . Issued Nov 30, 2004 - [SAIB SW-05-10](https://openairdocs.org/saib/SW-05-10) (historical): . Issued Nov 5, 2004 ## NTSB investigations None matched to N212TP. ## FAA accident and incident reports None matched to N212TP. ## 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) (356, 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 (Bell 212) - [STC SR12508IB](https://openairdocs.org/stc/SR12508IB): Installation of Personnel Carrying Devices (PCDs) for Human External Cargo (HEC). Ascent Aerospace Ltd - [STC SR12427IB](https://openairdocs.org/stc/SR12427IB): Installation of an AEM MTP136D Panel Mount FM Transceiver. Anodyne Electronics Manufacturing Corporation - [STC SR02736NY](https://openairdocs.org/stc/SR02736NY): Installation of Utility Basket on the right hand side. Alpine Aerotech Ltd - [STC SR02270SE](https://openairdocs.org/stc/SR02270SE): Fabrication and installation of Geneva Aviation Audio System. AEM USA Inc - [STC SR02444SE](https://openairdocs.org/stc/SR02444SE): Installation of P178 Failsafe Audio Mixer. AEM USA Inc - [STC SR12332SE](https://openairdocs.org/stc/SR12332SE): Installation of Mechanical Specialties, LLC Human External Cargo (HEC) and non-HEC Hook System. Mechanical Specialties, LLC - [STC SH3261SO](https://openairdocs.org/stc/SH3261SO): Installation of replacement skid tubes. Bell Helicopter Textron Inc - [STC SR04465NY](https://openairdocs.org/stc/SR04465NY): Installation of the iPad Mount. Avio Design Group Inc - [STC SR09922AC](https://openairdocs.org/stc/SR09922AC): Installation of a Foresight MX Condition Monitoring System. GPMS International Inc - [STC SR12068IB](https://openairdocs.org/stc/SR12068IB): Installation of the AFI4700 Electronic Flight Instrument. Alpine Aerotech LP - [STC SR12072IB](https://openairdocs.org/stc/SR12072IB): Manufacturing and Installation of Cargo Hold Nets; Maintenance must be in accordance with ICARUS Aero Inc. Instructions for Continued Airworthiness as shown on the attached FAA AML No. SR12072IB. Icarus Aero Inc - [STC SR11922AC](https://openairdocs.org/stc/SR11922AC): Demonstration of aircraft critical equipment and antenna systems tolerance of radio frequency interference (RFI) from intentional or spurious transmissions from certain Portable Electronic Devices (PEDs). Liberty Partners Inc - [STC SH8610SW](https://openairdocs.org/stc/SH8610SW): Fabrication of Isolair Eliminator II Model 4600-212/412 Fire Fighting System. Isolair Inc - [STC SR02590AK](https://openairdocs.org/stc/SR02590AK): Installation of Bell Lightweight Tailboom Modification. StandardAero Atlantic USA Inc - [STC SR00855DE](https://openairdocs.org/stc/SR00855DE): Installation of Tracking Patient Loading System. Air Methods LLC - [STC SR04132CH](https://openairdocs.org/stc/SR04132CH): Installation of Heli-Preheat Kit, p/n TA3132-1 for 115 volt application in accordance with Heli-Preheat Kit drawing TA3132-1 Revision G, dated December 11, 2023 or later FAA approved revisions and Preheat Kit Installation Instruction TNH3132 Revision C, dated November 7, 2023 or later FAA approved revisions. HARTZELL PROPELLER LLC - [STC SH1253SO](https://openairdocs.org/stc/SH1253SO): Installation of a wire strike protection system. Magellan Aerospace - [STC SR01779LA](https://openairdocs.org/stc/SR01779LA): Installation of the Emergency Float Kits. Dart Aerospace ULC - [STC SR00169IB](https://openairdocs.org/stc/SR00169IB): Installation of the Garmin G500H TXi Flight Display System. Eagle Copters Maintenance Ltd - [STC SR09343RC](https://openairdocs.org/stc/SR09343RC): Installation of Aero Seats and Systems, Inc., Life Raft Deployment System (LRDS). Bell Textron Inc - [STC SR00145IB](https://openairdocs.org/stc/SR00145IB): Installation of LH and RH Vertical Reference Door(s). Transwest Helicopters Ltd - [STC SR00142IB](https://openairdocs.org/stc/SR00142IB): Installation of the Integrated Health and Usage Monitoring System (HUMS). RMCI Canada Inc - [STC SR00141IB](https://openairdocs.org/stc/SR00141IB): Installation of the Aft Pedestal Stowage Compartment. Alpine Aerotech LP - [STC SH4056NM](https://openairdocs.org/stc/SH4056NM): Installation of pneumatic door actuators. Dart Aerospace USA Inc - [STC SR00131IB](https://openairdocs.org/stc/SR00131IB): Installation of an Artex Emergency Locator Transmitter (ELT) 4000 HM System. Eagle Copters Maintenance Ltd - [STC SR01865SE](https://openairdocs.org/stc/SR01865SE): Fabrication and installation of FastFin System. BLR Aerospace LLC - [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 SR00871LA](https://openairdocs.org/stc/SR00871LA): Installation of the Modular Seating System. LifePort LLC - [STC SR00094IB](https://openairdocs.org/stc/SR00094IB): Installation of Extended Port Seat Rail. Ascent Aerospace Ltd - [STC SR00080IB](https://openairdocs.org/stc/SR00080IB): Installation of the Garmin GRA 55 Radar Altimeter. Alpine Aerotech LP - [STC SR00077IB](https://openairdocs.org/stc/SR00077IB): Installation of the Two Place Seat Assembly. Ascent Aerospace Ltd - [STC SR00075IB](https://openairdocs.org/stc/SR00075IB): Installation of Cabin Furnishings. Ascent Aerospace Ltd - [STC SH400NW](https://openairdocs.org/stc/SH400NW): Installation of left hand bubble door with or without duplicate engine instruments. WSH, LLC - [STC SR03832NY](https://openairdocs.org/stc/SR03832NY): Installation of Full Vertical Reference Door P/N D412-761 for Left Hand Vertical Reference Operations. Dart Aerospace Limited - [STC SR04782NY](https://openairdocs.org/stc/SR04782NY): Installation of PCDs and HEC System. Ascent Aerospace Ltd - [STC SR00058IB](https://openairdocs.org/stc/SR00058IB): Installation of J301A Audio Controller. Alpine Aerotech LP - [STC SR00047IB](https://openairdocs.org/stc/SR00047IB): Installation of VIH Aerospace (VIHA) Pulse Light. VIH Aerospace Inc - [STC SR00035IB](https://openairdocs.org/stc/SR00035IB): Installation of the Garmin GTS 8xx Traffic System. Alpine Aerotech LP - [STC SR04615NY](https://openairdocs.org/stc/SR04615NY): Installation of the Human External Cargo (HEC) Suspension Line Kit. Boost Human External Cargo Systems Inc - [STC SR04616NY](https://openairdocs.org/stc/SR04616NY): Installation of the Dual HEC Hook System Provisions is to be performed. Boost Human External Cargo Systems Inc - [STC SR01124LA](https://openairdocs.org/stc/SR01124LA): Installation of Pratt & Whitney PT6T-3DE, or -3DF Twin-Pac in place of PT6T-3 or PT6T-3B Twin-Pac. ASCENT POWER INC - [STC SR00713SE](https://openairdocs.org/stc/SR00713SE): Installation of Onboard Systems International Cargo Hook Kit. Onboard Systems International - [STC SR01634SE](https://openairdocs.org/stc/SR01634SE): Installation of a Supplemental Lighting System. Aviation Specialties Unlimited Inc - [STC SR01903NY](https://openairdocs.org/stc/SR01903NY): Installation of a modified co-pilot seat. Transwest Helicopters Ltd - [STC SR04663NY](https://openairdocs.org/stc/SR04663NY): Installation of the Center Pedestal Riser. Alpine Aerotech LP - [STC SH5707NM](https://openairdocs.org/stc/SH5707NM): Fabrication of Onboard Systems Model 200-088-03 or 200-088-04 (without Load Weight) or 200-089-03, -04, -05 or -06 (with Load Weight) cargo hook suspension systems. Onboard Systems International - [STC SH5737NM](https://openairdocs.org/stc/SH5737NM): Replacement of Bell magnesium cargo hook bumper and ring Part Nos. 204-072-901-1 or -3, and 204-072-905-3, respectively, with Onboard bumper ring kit No. 210-092-00. Fabrication of Onboard Systems Model 210-092-00 bumper ring kit. Onboard Systems International - [STC SH5758NM](https://openairdocs.org/stc/SH5758NM): Fabrication of the Onboard Model 200-095-00 Multi-Channel Electrical Slip-Ring Kit. Onboard Systems International - [STC SR00277SE](https://openairdocs.org/stc/SR00277SE): Fabrication of Onboard Systems Model 528-002-00 or 528-002-01 cargo hook. Onboard Systems International LLC - [STC SR00699SE](https://openairdocs.org/stc/SR00699SE): Fabrication of Onboard Systems Model 200-246-00 cargo hook kit. Onboard Systems International All 356: https://openairdocs.org/aircraft/N212TP/stcs.md ## Related - Other Bell 212 aircraft: https://openairdocs.org/model/bell-212/aircraft.md - The Pratt & Whitney T400-CP-400 engine: https://openairdocs.org/engine/pratt-whitney-t400-cp-400.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.