SA955NW
Installation of a Continental E-225-4 engine using updraft cooling with a Hartzell HC-12X20-5/8433-O propeller. Held by S Duke Teitzel. Last revised June 27, 1980. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Sierra Hotel Aero Inc.
- Models
- Navion (Army L-17A)
- Type certificate
- A-782
- 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.