Skip to content

Aircraft STC directory

Cessna Aircraft 421C STCs

The Jun 30, 2026 FAA DRS snapshot contains 50 selected supplemental type certificates with status Current whose public applicability data names the Cessna Aircraft 421C. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

50
listed Current at snapshot
29
holder directories
11
modification categories
Jun 16, 2022
latest recorded revision

Modification demand surface

Other aircraft modifications21Engine and powerplant6Avionics5Cargo and special mission5Fuel systems3Propellers3Landing gear and brakes2Cabin and interiors2Electrical systems1Flight controls1Aircraft structures1

Recorded holders

RAM Aircraft Limited Partnership11Aviation Fabricators Inc3Sandel Avionics LLC2SMR Technologies2S-TEC Corporation2Genesys Aerosystems Inc.1Air Comm Corporation1LifePort LLC1SMR Technologies Inc1Spectrum Aeromed LLC dba Spectrum Aeromed1OCR Aviation1Griggs Aircraft Refinishing LLC1Paul/ Lanna Egan LLC1Spoilers Inc1Bell Helicopter Textron Inc.1Avcon Industries Inc1P2 Incorporated1Snaky Creek Enterprises LLC dba Spectrum Aeromed1M-20 Oil Separators LLC1MT- Propeller Entwicklung GmbH1

Recently revised 421C STCs

Showing the 50 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.