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Engine and powerplant

STC SR00266SE

FAA DRS lists SR00266SE as Current · Amended, held by Overseas Aircraft Support Inc., for Hagglund Helicopters UH-1H, Overseas Aircraft Support UH-1H, and JJASPP Engineering Services UH-1H. Recorded change: Replacement of the Lycoming Model T53-L-13B engine with a Lycoming Model T53-L-703 engine flat rated to the same power settings specified in Type Certificate Data Sheet (TCDS) H15NM. Snapshot dated June 30, 2026.

FAA-listed holder
Overseas Aircraft Support Inc.
Aircraft configurations
3
FAA revision date
FAA status
Current · Amended

Recorded modification

What the FAA record covers

Replacement of the Lycoming Model T53-L-13B engine with a Lycoming Model T53-L-703 engine flat rated to the same power settings specified in Type Certificate Data Sheet (TCDS) H15NM.

SR00266SE 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: Hagglund Helicopters UH-1H, Overseas Aircraft Support UH-1H, and JJASPP Engineering Services UH-1H. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Hagglund Helicopters UH-1HH15NMOverseas Aircraft Support UH-1HH7SOJJASPP Engineering Services UH-1HR00004RC

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Hagglund Helicopters UH-1H and Overseas Aircraft Support UH-1H, and 1 more aircraft configuration 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?

Related engine and powerplant STCs

SA00888SEEngine and powerplant

Option 1: Install Walter M601-E11S engine and a Hartzell HC-B3TW-3/T10282N+4 propeller or a Walter M601-E11 engine and an Avia V508-E-AG 106/A propeller per the Master Drawing List and Installation Instructions given in Approved Model List SA00888SE. (Note: Prior to July 17, 2002, the model M601-E11S engine was designated as the model M601-E11 engine). Option 2: Install a Walter M601-D11 engine and Avia V508-E-AG 106/A propeller per Cascade Flying Service Master Drawing List CFS-MDL-0001 Rev G, dated June 15, 2004, and Cascade Flying Service Document CFS-IM-107, Rev A, dated July 29, 2003, “Installation Instructions for Walter Turbine Installation on Air Tractor 300 & 400 Series Ag Aircraft,” or later FAA-approved revisions to these documents. NOTE: The Air Tractor model AT-400, AT-402B, AT-502, AT-502B, and AT-503A airplanes are not eligible for modification under option 2.

FAA holder: Cascade Flying Service LLC

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