SA5846NMFuel systems
Installation of wing tank flexible fuel cells.
FAA holder: Aerosport Fuel Cells, LLC
Aircraft STC directory
Textron Aviation 421B STCs
The Jun 30, 2026 FAA DRS snapshot contains 16 selected supplemental type certificates with status Current whose public applicability data names the Textron Aviation 421B. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
16
listed Current at snapshot
10
holder directories
4
modification categories
Feb 17, 2026
latest recorded revision
Modification demand surface
Other aircraft modifications7
Avionics5
Fuel systems2
Flight controls2
Recently revised 421B STCs
Showing the 16 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
View record
SA02731SEAvionics
Installation of Luma Technologies LT-4300 Series LED Display Panel and/or LT-4302 LED Gear Status Annunciator.
FAA holder: Luma Technologies LLC
SA197GLOther aircraft modifications
Install Cleveland conversion kit P/N 199-76.
FAA holder: Kaman Corporation Aircraft Wheel and Brake LLC
SA03317CHOther aircraft modifications
Installation of Max-Viz EVS-600 Enhanced Vision System.
FAA holder: PECO Inc
SA00998WI-DAvionics
Installation of Bendix/King KMD 550/850 Multi-Function Display, with optional KLN 94 Global Positioning System, KGP 560 General Aviation Enhanced Ground Proximity Warning System, RDR 2000 Weather Radar System and KMH 880 Multi-Hazard Awareness System or KTA 870 Traffic Awareness System.
FAA holder: Honeywell International Inc
SA952CEAvionics
Installation of King Radio Model KFC-300 automatic flight control system.
FAA holder: Honeywell International Inc
SA4410NMOther aircraft modifications
ONE ONLY STC, SN 421B0205, N5962M; Installation of Sperry Model GH14B Gyro Horizon.
FAA holder: Honeywell International Inc
SA987CEAvionics
Installation of Sperry SPZ-200/ STARS IVC automatic flight control system with optional Sperry AA-220/ RT-220 radar altimeter.
FAA holder: Honeywell International Inc
SA01750SEOther aircraft modifications
Fabrication and Installation of Dahlia Doubler.
FAA holder: Fliegen Works Inc.
SA01751SEOther aircraft modifications
Fabrication and Installation of Panida Doubler.
FAA holder: Fliegen Works Inc.
SA01752SEOther aircraft modifications
Fabrication and Installation of Panida Doubler.
FAA holder: Fliegen Works Inc.
SA09751DSFlight controls
Installation of an S-TEC 01326 Digital Flight Control System (DFCS).
FAA holder: S-TEC Corporation
SA18NWFlight controls
Installation of Fowler flaps, flap actuated drooped ailerons, flap actuated elevator trim and anti- servo rudder trim tab.
FAA holder: Sierra Industries Inc
SA09774ACOther aircraft modifications
Replacement of certain Goodrich pneumatic deicer boots.
FAA holder: Goodrich Corp.
SA574NWFuel systems
Installation of forward facing white lights, (100 Watts) and clear plastic wing tip tank nose cone and associated systems.
FAA holder: Knots 2U Ltd.
SA03527ATAvionics
Installation of an Avidyne EXP5000 Primary Flight Display (PFD).
FAA holder: Star Aviation