# STCs approved under this data sheet: TCDS A21NM A list on [TCDS A21NM](https://openairdocs.org/tcds/A21NM.md). Current certificates first, most recently changed first. - [STC ST01305WI-D](https://openairdocs.org/stc/ST01305WI-D.md): Modification of a Collins ALT-50A or ALT-55B Radio Altimeter system installation to a Collins ALT-1000 or ALT-4000 Radio Altimeter system installation in accordance with Collins Drawing Index as listed on AML No. ST01305WI-D, Revision -, or later FAA approved revision. · Rockwell Collins Inc - [STC ST12461IB](https://openairdocs.org/stc/ST12461IB.md): Installation of Cockpit Voice Recorder with optional RIPS Upgrade · Mid- Canada Mod Center - [STC ST00342BO](https://openairdocs.org/stc/ST00342BO.md): Installation of an NVIS / NVG Compatible Lighting System · ATI Engineering Services LLC - [STC ST03424CH](https://openairdocs.org/stc/ST03424CH.md): Certification of Automatic Dependent Surveillance - Broadcast (ADS-B) Out System with Rockwell Collins TDR-94/-94D Transponders · CMD Flight Solutions LLC - [STC ST04177AT](https://openairdocs.org/stc/ST04177AT.md): Installation of a Talon Aerospace LED Replacement General Purpose Lamps · Aaxico Technical Services Inc. - [STC ST01887WI](https://openairdocs.org/stc/ST01887WI.md): Installation of non-essential radome and component provisions, antennas, associated wiring and mounting provisions, and associated non-essential mission system components. · Sierra Nevada Corporation/Integrated Mission Systems - [STC ST01888WI](https://openairdocs.org/stc/ST01888WI.md): Installation of non-essential mission equipment configurable pallet assemblies. · Sierra Nevada Corporation-Integrated Mission Systems - [STC ST01889WI](https://openairdocs.org/stc/ST01889WI.md): Installation of a non-essential mission power and distribution system. · Sierra Nevada Corporation/Integrated Mission Systems - [STC ST01890WI](https://openairdocs.org/stc/ST01890WI.md): Installation of an EO/IR sensor and lift system in the left sponson. · Sierra Nevada Corporation-Integrated Mission Systems - [STC ST01891WI](https://openairdocs.org/stc/ST01891WI.md): Installation of an optional nose extension · Sierra Nevada Corporation-Integrated Mission Systems - [STC ST03776NY](https://openairdocs.org/stc/ST03776NY.md): Modification to upgrade existing Rockwell Collins TCAS (Model: TTR-920, TTR-921, and TTR-4000) at VERSION 7.0 to Rockwell Collins TCAS (Model: TTR-921, TTR-4000, and TTR-4100) at VERSION 7.1 (ACAS II) · Scandinavian Avionics Design ApS - [STC ST00881WI-D](https://openairdocs.org/stc/ST00881WI-D.md): Modification of a TCAS II system installation to Change 7.0 or Change 7.1 · Rockwell Collins Inc - [STC ST04211AT](https://openairdocs.org/stc/ST04211AT.md): Replace original equipment Nickel-Cadmium (NiCd) main batteries with Concorde Lead-Acid, main batteries along with associated hardware · Concorde Battery Corporation - [STC ST00266BO](https://openairdocs.org/stc/ST00266BO.md): Installation of a BAE Systems AN/AAR-57 Missile Warning System with an AN/ALE-47 Threat Adaptive Countermeasures Dispensing System · BAE Systems Information and Electronic Systems Integration Inc. - [STC ST01635WI-D](https://openairdocs.org/stc/ST01635WI-D.md): Modification of Rockwell Collins, Inc. VHF-4000 and VHF-4000E installations · Rockwell Collins Inc - [STC ST00234BO](https://openairdocs.org/stc/ST00234BO.md): Installation of a modified exhaust. · BAE SYSTEMS Information and Electronic Systems Integration Inc. - [STC ST02887CH-D](https://openairdocs.org/stc/ST02887CH-D.md): Installation of Universal Avionics Systems Corporation (UASC) EFI-890r Electronic Flight Display System · Duncan Aviation Inc - [STC ST00673WI-D](https://openairdocs.org/stc/ST00673WI-D.md): Modification of Collins VHF-22A/VHF-22B VHF COMM Receiver Transmitter with CTL-22 Control Pro Line II System Installation to a Collins VHF-22C/VHF-22D VHF COMM Receiver Transmitter with CTL-22C Control 8.33 kHz Pro Line II System installation. · Rockwell Collins Inc - [STC ST02887CH](https://openairdocs.org/stc/ST02887CH.md): Installation of Universal Avionics Systems Corporation (UASC) EFI-890r Electronic Flight Display System · Duncan Aviation Inc - [STC ST03537AT](https://openairdocs.org/stc/ST03537AT.md): Installation of a Single Class-A Sandel ST3400 Terrain Awareness Warning System with Remote Magnetic Indicator Function on copilot upper left instrument panel. · Presidential Airways Inc. - [STC ST02131LA](https://openairdocs.org/stc/ST02131LA.md): Installation of Cabin Interior Noise Reduction Kit · Aerocon Engineering Co. - [STC ST01142WI-D](https://openairdocs.org/stc/ST01142WI-D.md): Modification of a single or dual Collins TDR-94 or TDR-94D Mode S Transponder System installation with CTL-92 control head to a Flight ID capable Collins TDR-94 or TDR-94D Mode S Transponder System installation with CTL-92E control head. · Rockwell Collins Inc - [STC ST00844WI-D](https://openairdocs.org/stc/ST00844WI-D.md): Modification of Collins TCAS II or TCAS-94 (TCAS II) system installation with Collins TTR-920 Change 7.0 Receiver Transmitter to a Collins TCAS II or TCAS-94 OTCAS II) system installation with Collins TTR-921 or Collins TTR-4000 Change 7.0 TCAS Receiver Transmitter. · Rockwell Collins Inc - [STC ST01307WI-D](https://openairdocs.org/stc/ST01307WI-D.md): Modification of a Collins TVI-920/TVI-920D Vertical Speed/TCAS Indicator installation · Rockwell Collins Inc - [STC SA9169SC-D](https://openairdocs.org/stc/SA9169SC-D.md): Incorporated GPS approach capability to the existing certified GPS and EFIS installation. · L-3 Communications Integrated Systems LP ## 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 = 'A21NM') ORDER BY s.status = 'Current' DESC, s.status_date DESC, s.stc_number ``` This list as a web page: https://openairdocs.org/tcds/A21NM/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.