# STCs that may be installed: N198HM A list on [N198HM](https://openairdocs.org/aircraft/N198HM.md). Approved for this aircraft’s airframe or engine model. The registry doesn’t record which STCs an aircraft has; its records do. In force first, then newest. - [STC SH3319NM](https://openairdocs.org/stc/SH3319NM.md): Installation of Precise Flight Pulselite Control Unit in the Landing /Taxi Recognition Visual Control Light system, · Precise Flight Inc - [STC SH3744NM](https://openairdocs.org/stc/SH3744NM.md): Dual Battery Installation · WSH, LLC - [STC SR00026DE](https://openairdocs.org/stc/SR00026DE.md): Installation of tailboom 24 inch plug extension, commercial style main rotor blades, and rotorhead. · Midwest Aerospace TC LLC - [STC SR00073DE](https://openairdocs.org/stc/SR00073DE.md): Replacement of Lycoming T53-L-13 series powerplant · Midwest Aerospace TC LLC - [STC SR00119DE](https://openairdocs.org/stc/SR00119DE.md): Installation of an upgraded 42 degree Tail Rotor gearbox, P/N 212-040-003, and Control Cables · Midwest Aerospace TC LLC - [STC SR09167RC](https://openairdocs.org/stc/SR09167RC.md): Replacement of tail rotor control roller chain. · Midwest Aerospace TC LLC - [STC SR09177RC](https://openairdocs.org/stc/SR09177RC.md): Modification of the vertical fin spar · Midwest Aerospace TC LLC - [STC SR09224RC](https://openairdocs.org/stc/SR09224RC.md): Modification of the lift beam on the Model UH-1H · Midwest Aerospace TC LLC - [STC SR02761LA](https://openairdocs.org/stc/SR02761LA.md): Installation of UH-1H composite main rotor blades on the UH-1B helicopters · Northern X-Treme Helicopters - [STC SH5690NM](https://openairdocs.org/stc/SH5690NM.md): Installation of Advanced Technology Aircraft Co. engine barrier filter. · WSH, LLC - [STC SR02492LA](https://openairdocs.org/stc/SR02492LA.md): Installation of a Helicopter Technology Company main rotor blade assembly · Helicopter Technology Co - [STC SR01039SE](https://openairdocs.org/stc/SR01039SE.md): Fabrication of tail boom mounted strakes in accordance with Master Drawing List Number BL-UH1H-01, Revision D, dated September 10, 2001, or later Federal Aviation Administration (FAA)-approved revision; and installation of this strake system · BLR Aerospace LLC. - [STC SR03408CH](https://openairdocs.org/stc/SR03408CH.md): Install Airwolf Aerospace, LLC Tension-Torsion Strap Assemblies, P/N AA-204-310-101-101 or AA-204-310-101-103 · Airwolf Aerospace LLC - [STC SR02413LA](https://openairdocs.org/stc/SR02413LA.md): Installation of an AKV, Inc Exceedence and Trend Monitoring System kit P/N ETM1000 · AKV Inc. - [STC ST04270AT](https://openairdocs.org/stc/ST04270AT.md): Install the VTOL ASSALT V3 Windscreen Laminate Kit · VTOL LLC - [STC SR00767SE](https://openairdocs.org/stc/SR00767SE.md): Fabrication of Helipro spar replacement system · Vector Aerospace Helicopter Services USA Inc. - [STC SR02394AK](https://openairdocs.org/stc/SR02394AK.md): Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system · Seaplanes North LLC - [STC SR01742NY](https://openairdocs.org/stc/SR01742NY.md): Installation of extended height landing gear. · Dart Aerospace Limited - [STC SR02051LA](https://openairdocs.org/stc/SR02051LA.md): Installation of a VAn Horn Aviation Tail Rotor Blade. · Van Horn Aviation LLC - [STC SR09313RC](https://openairdocs.org/stc/SR09313RC.md): Fabrication, modification, and installation of a new vertical fin spar in accordance with Global Helicopter Technology, Inc., Drawing number VTF-030-802, Revision B, dated April 5, 2001, or later FAA approved revision. · Global Spar LLC - [STC SR09316RC](https://openairdocs.org/stc/SR09316RC.md): Fabrication, modification, and installation of a new vertical fin spar in accordance with Global Helicopter Technology, Inc., Drawing number VTF-030-801, Revision B, dated April 5, 2001, or later FAA approved revision. · Global Spar LLC - [STC SR01497AT](https://openairdocs.org/stc/SR01497AT.md): Manufacture of Windows in accordance with Aeronautical Accessories, Inc. Drawing List Report No. AA-97115, no revision, dated August 20, 1997, or later FAA approved revisions, and installation per Installation Instructions listed in that report. · Bell Helicopter Textron Inc. - [STC SR01812AT](https://openairdocs.org/stc/SR01812AT.md): Manufacture of Flitestep in accordance with Aeronautical Accessories, Inc. Drawing List Report No. AA-97166, no revision, dated December 19, 1997, or later FAA approved revisions, and installation per Aeronautical Accessories, Inc. Report AA-97087, Revision B, dated December 18, 1997, or later FAA approved revisions. · Bell Helicopter Textron Inc. - [STC SR01922AT](https://openairdocs.org/stc/SR01922AT.md): Manufacture of Locking Door Handle. · Bell Helicopter Textron Inc. - [STC SR01923AT](https://openairdocs.org/stc/SR01923AT.md): Manufacture of Air Deflector. · Bell Helicopter Textron Inc. - [STC SR01924AT](https://openairdocs.org/stc/SR01924AT.md): Manufacture of Low Skid or High Skid Landing Gear. · Bell Helicopter Textron Inc. - [STC SR00103SE](https://openairdocs.org/stc/SR00103SE.md): Installation of Aviation Development Corporation oil filter · Aviation Development Corporation - [STC SR01298NY](https://openairdocs.org/stc/SR01298NY.md): Installation of replacement crosstubes P/N D212-664. · Dart Aerospace Limited - [STC SR00563NY](https://openairdocs.org/stc/SR00563NY.md): Installation of Skidtubes and associated saddles · Dart Aerospace Limited - [STC SR01218AT](https://openairdocs.org/stc/SR01218AT.md): Manufacture of Flitestep. · Aeronautical Accessories, Inc. - [STC SH2621SO](https://openairdocs.org/stc/SH2621SO.md): Modification of main rotor blades P/N 204-011-250-5 or P/N 204-011-250-113 for restricted category. · Hill Mr. Jamie R. - [STC SA4302NM](https://openairdocs.org/stc/SA4302NM.md): Installation of Electronics Int'l digital automatic engine analyzer. · Electronics International - [STC SE00585AT](https://openairdocs.org/stc/SE00585AT.md): Installation of Aeronautical Accessories, Inc. PC Safety Valve Kit. · Bell Helicopter Textron Inc. · Lists T5313B - [STC SE00028EN](https://openairdocs.org/stc/SE00028EN.md): Installation of Pratt & Whitney Engine Services Inc. SmartCycle Plus Engine Monitoring System, P/N EMU-K-010-1 on specified T53 engine models. · Pratt & Whitney Engine Services Inc. · Lists T5309A - [STC SE00029EN](https://openairdocs.org/stc/SE00029EN.md): Installation of Pratt & Whitney Engine Services Inc. SmartCycle Plus Engine Monitoring System, P/N EMU-K-010-1 on specific T53 engine models. · Pratt & Whitney Engine Services Inc. · Lists T5313B - [STC SE01440NY](https://openairdocs.org/stc/SE01440NY.md): Conversion of Honeywell engine model T5313B to Honeywell engine model T5317A utilizing Aero Design, Ltd. conversion instructions C1437.02 dtd 4/30/01. · Dart Aerospace Limited · Lists T5313B ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT m.matched_by, s.stc_number, s.description, s.holder, s.status, s.status_date, m.matched_model FROM ( SELECT stc_number, min(side) AS side, arg_min(matched_by, side) AS matched_by, arg_min(matched_model, side) AS matched_model FROM (SELECT stc_number, 1 AS side, 'airframe' AS matched_by, matched_model FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_stc.parquet' WHERE aircraft_model_code = '3740001' UNION ALL SELECT stc_number, 2, 'engine', matched_model FROM 'https://openairdocs.org/data/latest/faa_engine_model_stc.parquet' WHERE engine_model_code = '41552') GROUP BY stc_number ) m JOIN 'https://openairdocs.org/data/latest/faa_stc.parquet' s USING (stc_number) ORDER BY m.side, s.status = 'Current' DESC, s.status_date DESC, s.stc_number ``` This list as a web page: https://openairdocs.org/aircraft/N198HM/stcs --- 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.