SA8902SW-D
Installation of S-TEC System 55 two axis automatic flight guidance system, Model ST-571, with optional autotrim system. Eligibility limited to PA-28RT-201, serial number 28R-7918070 and up, and Model PA-28RT-201T, serial number 28R-7931100 and up. Held by S-Tec Corporation, which holds 1,083 approved modifications in all. Last revised April 18, 2001. 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-28RT-201, PA-28RT-201T
- Type certificates
- 2A13, 2A13
- On this site
- Piper PA-28 Cherokee, Warrior, Archer and Arrow 18,636 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.