SA4678SW
Installation of Pratt & Whitney AC L PT6A-20, -27 engine and airplane modifications to increase the maximum takeoff gross weight to 8,000 pounds. Held by Southeastern Resources Corporation. Last revised August 9, 1988. System: engine.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Piper Aircraft Inc.
- Models
- PA-31-350
- Type certificate
- A20SO
- On this site
- Piper PA-31 Navajo and Chieftain 935 registered
- 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 20, 2026.