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Propellers

STC SA12225AC

FAA DRS lists SA12225AC as Current · Amended, held by High Cotton Aircraft Conversions LLC, for Pratt & Whitney Canada Corp PT6A-41, Pratt & Whitney Canada Corp PT6A-41AG, and Pratt & Whitney Canada Corp PT6A-42. Recorded change: This STC will incorporate P&W 1700 rpm propeller reduction gearbox on P&WC engines to allow Hartzell HC-B5MP-3( ), propeller installation. Snapshot dated June 30, 2026.

FAA-listed holder
High Cotton Aircraft Conversions LLC
Aircraft configurations
3
FAA revision date
FAA status
Current · Amended

Recorded modification

What the FAA record covers

This STC will incorporate P&W 1700 rpm propeller reduction gearbox on P&WC engines to allow Hartzell HC-B5MP-3( ), propeller installation.

SA12225AC 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: Pratt & Whitney Canada Corp PT6A-41, Pratt & Whitney Canada Corp PT6A-41AG, and Pratt & Whitney Canada Corp PT6A-42. Confirm the approved model list, serial effectivity, configuration, and certificate revision.

Pratt & Whitney Canada Corp PT6A-41E4EA
Pratt & Whitney Canada Corp PT6A-41AGE4EA
Pratt & Whitney Canada Corp PT6A-42E4EA

Buyer checks

Confirm before sourcing

  1. 01Does it cover the exact Pratt & Whitney Canada Corp PT6A-41 and Pratt & Whitney Canada Corp PT6A-41AG, and 1 more aircraft configuration model, serial range, and configuration?
  2. 02Which propeller, governor, spinner, engine, and vibration limits 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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