SE12225AC
This STC will incorporate P&W 1700 rpm propeller reduction gearbox on P&WC engines to allow 1700 rpm propeller installation. Held by High Cotton Aircraft Conversions, LLC. Last revised September 14, 2026. System: engine.
What it applies to
- Kind of product
- Engine
- Design holder
- Pratt & Whitney Canada Corp.; Pratt & Whitney Canada Corp.; Pratt & Whitney Canada Corp.
- Models
- PT6A-41, PT6A-41AG, PT6A-42
- Type certificates
- E4EA, E4EA, E4EA
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 21, 2026.