ST1048NW
Installation of a Franklin 6A-335-B engine, McCauley 2A31C21/84S-4 to -8 propeller, and associated systems; or installation of a Franklin 6A350-C1R or -C2 engine with McCauley 2A31C21/84S-4, or -8 or McCauley 2A34C22/84SF-4, -6, -8, or -10, or McCauley 2A34C201/90DA or Hartzell HC-C2YF-1BF/F8459-4 to -8 or MT-Propeller MTV-12-D/19230D propeller and associated systems. Held by Kown Bruce, which holds 2 approved modifications in all. Last revised August 21, 2002. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The Cessna Aircraft Company
- Models
- 170A
- 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.