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Aircraft STC directory

Learjet Learjet 35A (C-21A) STCs

The Jun 30, 2026 FAA DRS snapshot contains 75 selected supplemental type certificates with status Current whose public applicability data names the Learjet 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.

75
listed Current at snapshot
20
holder directories
10
modification categories
Apr 1, 2025
latest recorded revision

Modification demand surface

Other aircraft modifications23
Avionics21
Aircraft structures7
Electrical systems7
Cabin and interiors4
Cargo and special mission4
Safety and emergency equipment4
Engine and powerplant3
Landing gear and brakes1
Aircraft connectivity1

Recorded holders

Learjet Inc.26Avcon Industries Inc16Phoenix Air Group Inc.6LifePort LLC4Duncan Aviation Inc3Spectrum Aeromed LLC dba Spectrum Aeromed2Fargo Jet Center2East Coast Avionics2Acron Aviation Inc.1Securaplane Technologies Inc.1Raisbeck Engineering Inc.1Kaman Corporation Aircraft Wheel and Brake LLC1Paul/ Lanna Egan LLC1Honeywell International Inc1Eaglejet Aviation Inc.1Avcon Division Butler National Corporation1Aviation Fabricators Inc1ElectroSonics1West Star Aviation1Steinbach & Associates, Inc.1

Recently revised Learjet 35A (C-21A) STCs

Showing the 75 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.