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Aircraft STC directory

Learjet 35A (C-21A) STCs

The Jun 30, 2026 FAA DRS snapshot contains 158 selected supplemental type certificates with status Current whose public applicability data names the Learjet 35A (C-21A). Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

158
listed Current at snapshot
47
holder directories
12
modification categories
Sep 15, 2025
latest recorded revision

Recently revised 35A (C-21A) STCs

Showing the 100 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.

ST04393CHAircraft connectivity

Avionics upgrade installation of a Garmin GTN (TM) 750 Touchscreen Navigator interfaced to existing pilot side instruments and existing FC-200 or FC-530/-550 Autopilot and added GWX (TM) 70 Weather Radar. The Garmin GTN (TM) 750 GPS is paired with the added GTX (TM) 345R (or GTX 33/33D) Transponders for Automatic Broadcast Surveillance (ADS-B) OUT and ADS-B IN (GDL-88) capability with wireless download connectivity utilizing Garmin Connext®. Optional second Garmin GTN (TM) 650/750 interfaced to existing copilot side instruments only.

FAA holder: Royal Air Inc.

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ST04447CHAircraft connectivity

Installation of Garmin GTS (TM) 8000 TCAS/ACAS II Traffic Surveillance system, dual GTX (TM) 3000 Mode-S Extended Squitter Transponders and GDL® 88 receiver for a complete ADS-B In/Out capability and a Flight Stream 210 for wireless download connectivity using Garmin Connext®. Installation in accordance with Royal Air Master Document List No. RACB-MDL-3000, Revision A, dated January 06, 2020, or later FAA approved revision.

FAA holder: Royal Air Inc

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