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Other aircraft modifications

STC SE01537AT

FAA DRS lists SE01537AT as Current · Reissued, held by Whelen Aerospace Technologies, for Textron Lycoming AVCO IO-540-C1B5, Textron Lycoming AVCO O-540-A1D5, and Textron Lycoming AVCO O-540-A1B5, and 2 more aircraft configurations. Recorded change: Replace counterweights on Lycoming O-540-A1A5, -A1B5, -A1C5, -A1D5, and IO-540-C1B5 engines. Snapshot dated June 30, 2026.

FAA-listed holder
Whelen Aerospace Technologies
Aircraft configurations
5
FAA revision date
FAA status
Current · Reissued

Recorded modification

What the FAA record covers

Replace counterweights on Lycoming O-540-A1A5, -A1B5, -A1C5, -A1D5, and IO-540-C1B5 engines.

SE01537AT 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 Lycoming AVCO IO-540-C1B5, Textron Lycoming AVCO O-540-A1D5, and Textron Lycoming AVCO O-540-A1B5, and 2 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Textron Lycoming AVCO IO-540-C1B51E4Textron Lycoming AVCO O-540-A1D5E-295Textron Lycoming AVCO O-540-A1B5E-295Textron Lycoming AVCO O-540-A1A5E-295Textron Lycoming AVCO O-540-A1C5E-295

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Textron Lycoming AVCO IO-540-C1B5 and Textron Lycoming AVCO O-540-A1D5, and 3 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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