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Aircraft STC directory

Learjet 55 STCs

The Jun 30, 2026 FAA DRS snapshot contains 49 selected supplemental type certificates with status Current whose public applicability data names the Learjet 55. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

49
listed Current at snapshot
26
holder directories
9
modification categories
Sep 15, 2025
latest recorded revision

Modification demand surface

Other aircraft modifications25
Avionics7
Safety and emergency equipment6
Aircraft connectivity3
Electrical systems3
Engine and powerplant2
Cabin and interiors1
Aircraft structures1
Landing gear and brakes1

Recorded holders

Learjet Inc.9Duncan Aviation Inc6LifePort LLC3Avcon Industries Inc2Symetric Industries, DBA Extant Aerospace2Royal Air Inc2Peregrine2Honeywell International Inc2West Star Aviation2Butler National Corporation1Chippewa Aerospace, Inc.1Lee Aerospace Inc.1Air Comm Corporation1Pro Star Aviation, LLC1Paul/ Lanna Egan LLC1Southeast Aerospace Inc1ELDEC Corporation1Aviation Fabricators Inc1Rockwell Collins Inc1Aero Consulting Services Ltd1

Recently revised 55 STCs

Showing the 49 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