STC SA340SO
FAA DRS lists SA340SO as Current · Issued, held by Mike Jones Avionics & Maintenance, for Twin Commander Aircraft 500 Series. Recorded change: Replacing Continental IO 470 M Engines with Continental IO 520 E engines rated at 300hp for takeoff 285hp continuous, and the installation of Hartzell 3 bladed propellers. EHC A3VF-2B/7636D. Snapshot dated June 30, 2026.
Recorded modification
What the FAA record covers
SA340SO 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: Twin Commander Aircraft 500 Series. Confirm the approved model list, serial effectivity, configuration, and certificate revision.
Related aircraft performance STCs
Increase gross weight from 3,000 lbs. to 3,800 lbs.
FAA holder: Helio Alaska Inc.
Increase normal category maximum gross weight from 2300 to 2400 lbs. and increase utility category maximum grow weight from 2000 to 2100 lbs. per Installation Instructions, STC SA1945CE, Gross Weight Increase for the C172N with an FAA approval date of January 3, 1989, or later.
FAA holder: Power Flow Systems Inc.
Increase in maximum gross weight from 3,000 lbs. to 3,300 lbs.
FAA holder: Helio Alaska Inc.
FAA record reference
- STC number
- SA340SO
- Product
- Aircraft · Small Airplane
- Country
- United States
- Application date
- December 8, 1965
- Revision date
- December 28, 2010
- CFR references
- Not listed