# STCs that may be installed: N94AP A list on [N94AP](https://openairdocs.org/aircraft/N94AP.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 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 SR00420NY](https://openairdocs.org/stc/SR00420NY.md): Installation of Airwolf remote mounted engine oil filter Model AFC-600 · Airwolf Filter, Corp - [STC SR02487AK](https://openairdocs.org/stc/SR02487AK.md): Installation of L-3 Communications Avionics Systems ESI-500 Standby Instrument System · ADS-B Technologies, LLC - [STC SR02470AK](https://openairdocs.org/stc/SR02470AK.md): Installation of the L-3 Communications NGT -1000/2000/2500 ADS-B System · ADS-B Technologies, LLC - [STC SR02471AK](https://openairdocs.org/stc/SR02471AK.md): Installation of the L-3 Communications NGT -9000/9000R ADS-B System · ADS-B Technologies, 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 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 SH247NW](https://openairdocs.org/stc/SH247NW.md): Installation and maintenance of exhaust ejector engine oil cooler system. (UH-12D (ARMY UH-23D modified per STC SH177WE) · Siam Hiller Holdings Inc - [STC SH295NW](https://openairdocs.org/stc/SH295NW.md): Installation of Hiller auxiliary fuel tanks kit No 72041. (UH-12D (ARMY UH-23D) modified per STC SH177WE) · Siam Hiller Holdings Inc - [STC SH297NW](https://openairdocs.org/stc/SH297NW.md): Installation and maintenance of a cabin heater system. (UH-12D (ARMY UH-23D modified per STC SH178WE) · Siam Hiller Holdings Inc - [STC SH299NW](https://openairdocs.org/stc/SH299NW.md): Installation of Soloy cargo racks. · Siam Hiller Holdings Inc - [STC SH321NW](https://openairdocs.org/stc/SH321NW.md): Installation of a Bendix fuel control/power governor system on the Allison 250-C20 turbine powered Hiller UH-12D rotorcraft. (UH-12D (ARMY UH-23D) modified per STC SH177WE) · Siam Hiller Holdings Inc - [STC SH338NW](https://openairdocs.org/stc/SH338NW.md): Installation of transmission oil cooling system on the Allison250-C20 turbine powered Hiller UH-12D rotorcraft. (UH-12D (ARMY UH-23D modified per STC SH177WE) · Siam Hiller Holdings Inc - [STC SH380NW](https://openairdocs.org/stc/SH380NW.md): Installation and maintenance of engine auto reignition system. (UH-12D (ARMY UH-23D) modified per STC SH177WE) · Siam Hiller Holdings Inc - [STC SH505NW](https://openairdocs.org/stc/SH505NW.md): Installation of cargo release pedal. · Siam Hiller Holdings Inc - [STC SH559NW](https://openairdocs.org/stc/SH559NW.md): Installation and maintenance of engine inlet air cleaner system. (UH-12D (ARMY UH-23D) modified per STC SH177WE) · Siam Hiller Holdings Inc - [STC SA00680SE](https://openairdocs.org/stc/SA00680SE.md): Installation of Electronics International model UBG-16 or UBG-16T bar graph engine analyzer. · Electronics International - [STC SH177WE](https://openairdocs.org/stc/SH177WE.md): Installation of Allison 250-C20/250-C20B engine and related changes. · Siam Hiller Holdings Inc - [STC SH287NW](https://openairdocs.org/stc/SH287NW.md): Installation of Hiller landing gear float kit No. 44012. (UH-12d (ARMY UH-23D modified per STC SH177WE) · Siam Hiller Holdings Inc - [STC SH475NW](https://openairdocs.org/stc/SH475NW.md): Installation of an agricultural spray system. (UH-12D (ARMY UH-23D) modifier per STC) · Siam Hiller Holdings Inc - [STC SR01430LA](https://openairdocs.org/stc/SR01430LA.md): Installation of Stainless Steel Skid shoes. · Papas Gary Los Angeles Laboratories 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 SA2687NM](https://openairdocs.org/stc/SA2687NM.md): Installation of Truboplus/ Electronics Int'l gauges and switches. · Aero Manufacturing 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 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 SH359GL](https://openairdocs.org/stc/SH359GL.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 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 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 SH618NW](https://openairdocs.org/stc/SH618NW.md): Installation of the Onboard Weighing System Adapter No. 1500, for use with Eastern Rotorcraft Cargo Hook No 2A15E · Onboard Weighing Systems - [STC SH877SO](https://openairdocs.org/stc/SH877SO.md): Installation of tail rotor guard assembly. · Jungle Aviation & Radio Service, Inc. - [STC SA2350NM](https://openairdocs.org/stc/SA2350NM.md): Installation of Electronics International Inc digital carburetor/outside air temperature gauges listed on the attached continuation sheet and the associated accessories. · Electronics International ## 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 = '4360118') 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/N94AP/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.