SA09359AC-D
Installation of S-TEC System 20/30 single and two-axis automatic flight guidance systems, Model ST-816-20/30. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised July 15, 2008. System: other and general.
What it applies to
- Kind of product
- Aircraft
- Design holder
- The New Piper Aircraft Inc.; The New Piper Aircraft Inc.
- Models
- PA-30, PA-39
- Type certificates
- A1EA, A1EA
- On this site
- Piper PA-30 Twin Comanche 879 registered
Piper PA-39 Twin Comanche C/R 82 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 5, 2026.