SA4-783
Lycoming 150 hp O-340-A1A engine and Hartzell HC82XG-2B/8433-12 propellers. Held by Mckenzie Flying Service INC, which holds 6 approved modifications in all. Last revised April 8, 1991. System: propeller.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The New Piper Aircraft Inc.
- Models
- PA-23
- Type certificate
- 1A10
- On this site
- Piper PA-23 Apache and Aztec 1,316 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.