# STCs approved under this data sheet: TCDS 4H11 A list on [TCDS 4H11](https://openairdocs.org/tcds/4H11.md). Current certificates first, most recently changed first. Page 1 of 2 · 75 STCs - [STC SR04637CH](https://openairdocs.org/stc/SR04637CH.md): Replacement of existing main ship battery with Lithium Ion Battery and installation of Annunciator Control Panel · Airwolf Aerospace LLC - [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 SH1152NW](https://openairdocs.org/stc/SH1152NW.md): Installation of the Automatic Flagman Model 135 Control Stick Grip · Air Products & Parts LLC - [STC SR02704SE](https://openairdocs.org/stc/SR02704SE.md): Installation and maintenance of the Sunspot 36 and 46 series lights · AeroLED's Holdings LLC - [STC SR00359BO](https://openairdocs.org/stc/SR00359BO.md): Installation of Parmetheus Plus LED PAR36 and PAR46 taxi and landing lights. · Whelen Aerospace Technologies - [STC SR01845SE](https://openairdocs.org/stc/SR01845SE.md): Installation of a barrier air filtration system · Cascade Flying Service LLC - [STC SR00420NY](https://openairdocs.org/stc/SR00420NY.md): Installation of Airwolf remote mounted engine oil filter Model AFC-600 · Airwolf Filter, Corp - [STC SR01802WI](https://openairdocs.org/stc/SR01802WI.md): To allow the use of UL91 or UL94 (minimum) grade aviation fuel per ASTM D7547. · Swift Fuels LLC - [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 SA00068SE](https://openairdocs.org/stc/SA00068SE.md): Installation of fuel flow/pressure instruments. (W/TSIO-360-MB1) · Electronics International Inc. - [STC SA2693NM](https://openairdocs.org/stc/SA2693NM.md): Installation of Electronics International digital volt/amp gauges and accessories. · Electronics International Inc. - [STC SH381NW](https://openairdocs.org/stc/SH381NW.md): Installation and maintenance of engine auto reignition system. (UH-12E modified per STC SH178WE) · Siam Hiller Holdings Inc - [STC SH476NW](https://openairdocs.org/stc/SH476NW.md): Installation of an agricultural spray system. · Siam Hiller Holdings Inc - [STC SA593CH](https://openairdocs.org/stc/SA593CH.md): Install Champion SlickSTART magneto booster system. · Champion Aerospace LLC - [STC SA02033AT](https://openairdocs.org/stc/SA02033AT.md): Modification to install an air-oil separator to prevent oil from being aspirated from the engine breather line. · M-20 Oil Separators LLC - [STC SH178WE](https://openairdocs.org/stc/SH178WE.md): Installation of Allison 250-C20/250-C20B engine and related changes. (UH-12E-L (4 place)) · Siam Hiller Holdings Inc - [STC SH248NW](https://openairdocs.org/stc/SH248NW.md): Installation and maintenance of exhaust ejector engine oil cooler system. (UH-12E modified per STC SH178WE) · Siam Hiller Holdings Inc - [STC SH288NW](https://openairdocs.org/stc/SH288NW.md): Installation of Hiller landing gear float kit No. 44012. (UH-12E modified per STC SH178WE) · Siam Hiller Holdings Inc - [STC SH296NW](https://openairdocs.org/stc/SH296NW.md): Installation of Hiller auxiliary fuel tanks kit No. 72041. (UH-12E modified per STC SH178WE) · Siam Hiller Holdings Inc - [STC SH298NW](https://openairdocs.org/stc/SH298NW.md): Installation and maintenance of a cabin heater system. (UH-12E modified per STC SH178WE) · Siam Hiller Holdings Inc - [STC SH300NW](https://openairdocs.org/stc/SH300NW.md): Installation of Soloy cargo racks. · Siam Hiller Holdings Inc - [STC SH322NW](https://openairdocs.org/stc/SH322NW.md): Installation of a Bendix fuel control/power governor system on the Allison 250-C20 turbine powered Hiller UH-12E rotorcraft. (UH-12E modified per STC SH178WE) · Siam Hiller Holdings Inc - [STC SH339NW](https://openairdocs.org/stc/SH339NW.md): Installation of transmission oil cooling system on the Allison250-C20 turbine powered Hiller UH-12E rotorcraft. (UH-12E modified per STC SH178WE) · Siam Hiller Holdings Inc - [STC SH506NW](https://openairdocs.org/stc/SH506NW.md): Installation of cargo release pedal. · Siam Hiller Holdings Inc - [STC SH560NW](https://openairdocs.org/stc/SH560NW.md): Installation and maintenance of engine inlet air cleaner system. · Siam Hiller Holdings Inc - [STC SH634NW](https://openairdocs.org/stc/SH634NW.md): Installation of Tundra Pads. · Siam Hiller Holdings Inc - [STC SA01258SE](https://openairdocs.org/stc/SA01258SE.md): Installation of the Automatic Flagman Dispenser Models in accordance with Automatic Flagman Master Drawing Lists specified in attached AML, or later FAA approved revision.This STC supercedes several existing STC s as listed in the notes on the attached AML. · R-S Sales Inc. - [STC SA02520AT](https://openairdocs.org/stc/SA02520AT.md): Installation of M-20 Oil Separator, model 600-WP. · M-20 Oil Separators LLC - [STC SH849NW](https://openairdocs.org/stc/SH849NW.md): Installation of North American Industries, Inc., Model No. 5 Automatic Flagman · R-S Sales Inc. - [STC SH201WE](https://openairdocs.org/stc/SH201WE.md): Installation of stirrup assemblies to directional control pedals for operation by handicapped pilot. (US ARMY OH-13E 205A) · Dallwig Barry C - [STC SA2687NM](https://openairdocs.org/stc/SA2687NM.md): Installation of Truboplus/ Electronics Int'l gauges and switches. · Aero Manufacturing Inc. - [STC SH12CE](https://openairdocs.org/stc/SH12CE.md): Replace existing engine induction air filter with AC Spark Plug Filter. · Brackett Aero Filters Inc. - [STC SH767NW](https://openairdocs.org/stc/SH767NW.md): Installation of Chadwick Model C-512S spray system. · Tower Aerospace, Inc - [STC SR00135LA](https://openairdocs.org/stc/SR00135LA.md): Installation of Yehnert Tail Rotor Blades YH-278 as replacements for Hiller Tail Rotor Blades 55073. · Yehnert Helicopters, Inc - [STC SA1626NM PAGE 1](https://openairdocs.org/stc/SA1626NM%20PAGE%201.md): Installation of Electronics Int'l Digital EGT/CHT Instruments and accessories. (201 Series) · Electronics International - [STC SH5729NM](https://openairdocs.org/stc/SH5729NM.md): Full flow oil filter system · Grogan Don - [STC SA2350NM PAGE 1](https://openairdocs.org/stc/SA2350NM%20PAGE%201.md): Installation of Electronics International Inc digital carburetor/outside air temperature gauges · Electronics International - [STC SH300GL](https://openairdocs.org/stc/SH300GL.md): Installation of Facet Enterprises engine lubrication system scavenge filter. · Facet Filter Products - [STC SH2763SO](https://openairdocs.org/stc/SH2763SO.md): Installation of control rotor safety cable. · JAARS Inc. - [STC SA4302NM](https://openairdocs.org/stc/SA4302NM.md): Installation of Electronics Int'l digital automatic engine analyzer. · Electronics International - [STC SH2611SO](https://openairdocs.org/stc/SH2611SO.md): Installation of cargo rack. · JAARS Inc. - [STC SA3862NM PAGE 1](https://openairdocs.org/stc/SA3862NM%20PAGE%201.md): Installation of Electronics International Primary TIT/EGT/CHT instruments, remote switches and associated accessories. · Electronics International - [STC SH4173NM](https://openairdocs.org/stc/SH4173NM.md): Installation of Simplex Model 7600 modular electrical system. (US ARMY OH-13E M74A) · Simplex Manufacturing Company - [STC SH3362NM](https://openairdocs.org/stc/SH3362NM.md): Installation of a Tail Rotor Blade Protective Coating · Columbia Helicopters Inc - [STC SA2190NM PAGE 1](https://openairdocs.org/stc/SA2190NM%20PAGE%201.md): Installation of electronics International Digital Volt/Amp Gauges and Accessories. · Electronics International - [STC SH4997SW](https://openairdocs.org/stc/SH4997SW.md): Installation of Lycoming TIVO-540-A2A engine · Craig Helicopters - [STC SH302NM](https://openairdocs.org/stc/SH302NM.md): Installation of two Albany Int. dispersion pads, Drawing No. 21940 or 21961. · Albany International - [STC SH1014NW](https://openairdocs.org/stc/SH1014NW.md): Simplex Model 4600 spray system · Simplex Manufacturing Co - [STC SH1147NW](https://openairdocs.org/stc/SH1147NW.md): Installation of a Chadwick Spray System · Helicopter Maintenance Corp. - [STC SH887NW](https://openairdocs.org/stc/SH887NW.md): Simplex Model 4650 spray system - agricultural. · Simplex Manufacturing Co Next page: https://openairdocs.org/tcds/4H11/stcs.md?page=2 ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT s.stc_number, s.description, s.holder, s.status, s.status_date FROM 'https://openairdocs.org/data/latest/faa_stc.parquet' s WHERE s.stc_number IN (SELECT stc_number FROM 'https://openairdocs.org/data/latest/faa_stc_model.parquet' WHERE tcds_number = '4H11') ORDER BY s.status = 'Current' DESC, s.status_date DESC, s.stc_number ``` This list as a web page: https://openairdocs.org/tcds/4H11/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.