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Aircraft STC directory

Learjet 55C STCs

The Jun 30, 2026 FAA DRS snapshot contains 30 selected supplemental type certificates with status Current whose public applicability data names the Learjet 55C. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

30
listed Current at snapshot
15
holder directories
9
modification categories
Sep 15, 2025
latest recorded revision

Modification demand surface

Other aircraft modifications13
Safety and emergency equipment4
Aircraft connectivity3
Avionics3
Electrical systems2
Engine and powerplant2
Cabin and interiors1
Aircraft structures1
Landing gear and brakes1

Recorded holders

Learjet Inc.7LifePort LLC3Duncan Aviation Inc3Avcon Industries Inc2Royal Air Inc2Peregrine2Honeywell International Inc2West Star Aviation2Butler National Corporation1Chippewa Aerospace, Inc.1Lee Aerospace Inc.1ELDEC Corporation1Aviation Fabricators Inc1JetCorp1AeroMech Incorporated1

Recently revised 55C STCs

Showing the 30 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.

View record
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

View record