STC SA1663NM
FAA DRS lists SA1663NM as Current · Reissued, held by Sierra Industries Ltd., for Textron Aviation 421C. Recorded change: Addition of fowler wing flaps, elevator trim spring with cockpit tension select lever, fuselage strakes, and nacelle strakes. Snapshot dated June 30, 2026.
FAA-listed holder
Aircraft configurations
1
FAA revision date
FAA status
Current · Reissued
Recorded modification
What the FAA record covers
SA1663NM identifies the approval, recorded holder, named aircraft, and modification scope. It does not confirm kit availability, serial-number effectivity, data rights, price, or installation authority.
Applicability
Aircraft named in FAA DRS
Named aircraft: Textron Aviation 421C. Confirm the approved model list, serial effectivity, configuration, and certificate revision.
Related engine and powerplant STCs
Installation of CAPCO Auxiliary Nacelle Fuel Tanks.
FAA holder: PHILL-Air Inc.
Installation of a Heli-Logistics Ltd. P/N HL92116 engine upper firewall.
FAA holder: Heli-Logistics Ltd
Installation of HP Turbine vanes with improved cooling.
FAA holder: Atlantic Turbines International Inc.
FAA record reference
- STC number
- SA1663NM
- Product
- Aircraft · Small Airplane
- Country
- United States
- Application date
- September 30, 1981
- Revision date
- July 31, 2017
- CFR references
- Part 3, Part 21