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Flight controls

STC SA18NW

FAA DRS lists SA18NW as Current · Reissued, held by Sierra Industries Inc, for Textron Aviation 421, Textron Aviation 421A, and Textron Aviation 421B. Recorded change: Installation of Fowler flaps, flap actuated drooped ailerons, flap actuated elevator trim and anti- servo rudder trim tab. Snapshot dated June 30, 2026.

FAA-listed holder
Sierra Industries Inc
Aircraft configurations
3
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

Installation of Fowler flaps, flap actuated drooped ailerons, flap actuated elevator trim and anti- servo rudder trim tab.

SA18NW 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 421, Textron Aviation 421A, and Textron Aviation 421B. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Textron Aviation 421A7CETextron Aviation 421AA7CETextron Aviation 421BA7CE

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Textron Aviation 421 and Textron Aviation 421A, and 1 more aircraft configuration model, serial range, and configuration?
  2. 02Which control configuration, rigging, limitations, and inspections apply?
  3. 03Who can legally supply the design data, kit, instructions, and ICAs?
  4. 04What parts, labor, conformity, and return-to-service work are excluded?

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