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Other aircraft modifications

STC ST04481CH

FAA DRS lists ST04481CH as Current · Issued, held by Butler National Corporation, for Learjet 35, Learjet 35A (C-21A), and Learjet 36, and 1 more aircraft configuration. Recorded change: Replacement of similar functioning circuit and switch for obsolete steering interface unit (SIU) in accordance with Butler National Master Data List 0200 I 020 Revisio n (A) , dat ed 14 MAY 2021, or later FAA Approved Revision. Snapshot dated June 30, 2026.

FAA-listed holder
Butler National Corporation
Aircraft configurations
4
FAA revision date
FAA status
Current · Issued

Recorded modification

What the FAA record covers

Replacement of similar functioning circuit and switch for obsolete steering interface unit (SIU) in accordance with Butler National Master Data List 0200 I 020 Revisio n (A) , dat ed 14 MAY 2021, or later FAA Approved Revision.

ST04481CH 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: Learjet 35, Learjet 35A (C-21A), and Learjet 36, and 1 more aircraft configuration. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Learjet 35A10CELearjet 35A (C-21A)A10CELearjet 36A10CELearjet 36AA10CE

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Learjet 35 and Learjet 35A (C-21A), and 2 more aircraft configurations model, serial range, and configuration?
  2. 02Which configuration, parts, installation data, limitations, and ICAs 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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