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Engine and powerplant

STC SA04121CH

FAA DRS lists SA04121CH as Current · Amended, held by Svenn s Aviation LLC, for Piper Aircraft PA-18-105 (Special), Piper Aircraft PA-18-125 (Army L-21A), and Piper Aircraft PA-18-135, and 29 more aircraft configurations. Recorded change: Installation of Lycoming 0-320 engine. Snapshot dated June 30, 2026.

FAA-listed holder
Svenn s Aviation LLC
Aircraft configurations
32
FAA revision date
FAA status
Current · Amended

Recorded modification

What the FAA record covers

Installation of Lycoming 0-320 engine.

SA04121CH 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: Piper Aircraft PA-18-105 (Special), Piper Aircraft PA-18-125 (Army L-21A), and Piper Aircraft PA-18-135, and 29 more aircraft configurations. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Piper Aircraft PA-18-105 (Special)1A2Piper Aircraft PA-18-125 (Army L-21A)1A2Piper Aircraft PA-18-1351A2Piper Aircraft PA-18-1501A2Piper Aircraft PA-181A2Piper Aircraft PA-18A-1351A2Piper Aircraft PA-18A-1501A2Piper Aircraft PA-18A1A2Piper Aircraft PA-18AS-1251A2Piper Aircraft PA-18AS-1351A2Piper Aircraft PA-18AS-1501A2Piper Aircraft PA-18S-105 (Special)1A2Piper Aircraft PA-18S-1251A2Piper Aircraft PA-18S-1351A2Piper Aircraft PA-18S-1501A2Piper Aircraft PA-18S1A2Piper Aircraft PA-19 (Army L-18C)1A2Piper Aircraft PA-19S1A2Piper Aircraft PA-20-1151A4Piper Aircraft PA-20-1351A4Piper Aircraft PA-201A4Piper Aircraft PA-20S-1151A4Piper Aircraft PA-20S-1351A4Piper Aircraft PA-20S1A4Piper Aircraft PA-22-1081A6Piper Aircraft PA-22-1351A6Piper Aircraft PA-22-1501A6Piper Aircraft PA-22-1601A6Piper Aircraft PA-221A6Piper Aircraft PA-22S-1351A6Piper Aircraft PA-22S-1501A6Piper Aircraft PA-22S-1601A6

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Piper Aircraft PA-18-105 (Special) and Piper Aircraft PA-18-125 (Army L-21A), and 30 more aircraft configurations model, serial range, and configuration?
  2. 02Which powerplant configuration, limits, instruments, and maintenance data 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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