What it approves
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.
ADs that name this STC · 0
An AD can apply because an STC is installed, or mention one in its text.
No AD in this release names this STC