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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

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

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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