Aircraft STC directory
Learjet Learjet 28 STCs
The Jun 30, 2026 FAA DRS snapshot contains 5 selected supplemental type certificates with status Current whose public applicability data names the Learjet Learjet 28. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
5
listed Current at snapshot
5
holder directories
5
modification categories
Sep 1, 2016
latest recorded revision
Modification demand surface
Cargo and special mission1
Cabin and interiors1
Engine and powerplant1
Avionics1
Other aircraft modifications1
Recently revised Learjet 28 STCs
Showing the 5 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
SA2446SWCabin and interiors
Installation of cabin door closing system in accordance with Drawing List No. 34 dated 3/17/80 or later FAA approved revision.
FAA holder: Avcon Industries Inc
SA8930SWEngine and powerplant
Installation of Bizjet International Inlet Anti-ice Heat Blanket.
FAA holder: Bizjet International Sales & Support Inc
ST01511NYAvionics
Installation of Insight Instrument Corporation (IIC) Heading Gyro 4000.
FAA holder: Insight Instrument Corporation
ST09568SCOther aircraft modifications
Modification of existing refrigerant R12 air conditioning systems to convert them into refrigerant R134a systems on the aircraft identified above.
FAA holder: Steinbach & Associates, Inc.