SA342NW
Installation of Hartzell HC-C2YF-1FB/F8459-6 propeller on a Franklin 6A-350-C2 engine and Edo 248-2440 floats. Held by Seaplane Flying INC, which holds 18 approved modifications in all. Last revised September 17, 1976. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Cessna Aircraft Company
- Models
- 170B
- Type certificate
- A-799
- On this site
- Cessna 170 2,085 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.