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Aircraft STC directory

Cessna Aircraft 421A STCs

The Jun 30, 2026 FAA DRS snapshot contains 34 selected supplemental type certificates with status Current whose public applicability data names the Cessna Aircraft 421A. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

34
listed Current at snapshot
26
holder directories
8
modification categories
Jun 16, 2022
latest recorded revision

Modification demand surface

Other aircraft modifications17
Engine and powerplant4
Cargo and special mission4
Avionics3
Electrical systems2
Cabin and interiors2
Aircraft structures1
Fuel systems1

Recorded holders

Aviation Fabricators Inc3BF Goodrich Aerospace2RAM Aircraft Limited Partnership2Genesys Aerosystems Inc.1Sandel Avionics LLC1Air Comm Corporation1LifePort LLC1Spectrum Aeromed LLC dba Spectrum Aeromed1OCR Aviation1Griggs Aircraft Refinishing LLC1Paul/ Lanna Egan LLC1Bell Helicopter Textron Inc.1Icarus Avionics, LLC1P2 Incorporated1Snaky Creek Enterprises LLC dba Spectrum Aeromed1M-20 Oil Separators LLC1Honeywell International Inc1Saint-Gobain Performance Plastics Corp1Precise Flight Inc1Avidyne Corporation1

Recently revised 421A STCs

Showing the 34 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.

SA362CEOther aircraft modifications

Description of Type Design Change: Install Hoskins Twilighter MK III per Installation Manual and Specification Sheets as amended, dated September 20, 1965. Install Hoskins Twilighter MK IIIB Supplemental Lights per the following required data: Models 310 through 310F and 320 Specification Sheets P/N 65-0025-5 with drawings listed; Models 310G through N and 320-1 through F Specification Sheets P/N 65-0025-6 with drawings listed; Models 401, 401A and 402 Specification Sheets P/N 65-0025-9 with drawing listed; Models 411 and 411A Specification Sheets P/N 65-0025-7 with drawings listed; and Models 421 and 421A Specification Sheets P/N 65-0027-8 with drawings listed.

FAA holder: BF Goodrich Aerospace

View record