What it approves
Increase in impeller drive ratio from 10:1 to 12:1.
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 · 2
| Make | Model | Data sheet |
|---|---|---|
| Pratt & Whitney Division | R-985 Series | 5E-1 |
| Pratt & Whitney Division | Wasp Jr. Series | E-123 |