What it approves
Installation of S-TEC yaw damper system, Model ST-591.
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
Approved models · 7
| Make | Model | Data sheet |
|---|---|---|
| Twin Commander Aircraft Corporation | 680T | 2A4 |
| Twin Commander Aircraft Corporation | 680V | 2A4 |
| Twin Commander Aircraft Corporation | 680W | 2A4 |
| Twin Commander Aircraft Corporation | 681 | 2A4 |
| Twin Commander Aircraft Corporation | 690 | 2A4 |
| Twin Commander Aircraft Corporation | 690A | 2A4 |
| Twin Commander Aircraft Corporation | 690B | 2A4 |