STC SA438NW
FAA DRS lists SA438NW as Current · Reissued, held by Sierra Industries Inc, for Textron Aviation 421C. Recorded change: Addition of Fowler wing flaps aileron droop system, elevator trim spring and new flap actuation system. Snapshot dated June 30, 2026.
Recorded modification
What the FAA record covers
Addition of Fowler wing flaps aileron droop system, elevator trim spring and new flap actuation system.
SA438NW 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.
Buyer checks
Confirm before sourcing
- 01Does it cover the exact Textron Aviation 421C model, serial range, and configuration?
- 02Which control configuration, rigging, limitations, and inspections apply?
- 03Who can legally supply the design data, kit, instructions, and ICAs?
- 04What parts, labor, conformity, and return-to-service work are excluded?
Related flight controls STCs
Installation of rudder spring tabs and fuselage saddle, horizontal stabilizer incidence inc to 1 degree; flap tracks cut off, flap travel reduced to 51% of original travel.
FAA holder: Signature Flight Support Corporation
Installation of electric trim system.
FAA holder: Signature Flight Support Corporation
Installed a positive stop in the rudder system.
FAA holder: Signature Flight Support Corporation