Checks
Well-known member
- Joined
- Dec 23, 2001
- Posts
- 447
In my SA-227 operators manual, there is a note under Engine Failure-Takeoff Continued that states the following:
NOTE
In the event of an engine failure and an NTS system and/or feather valve malfunction, setting the power lever fully forward will drive the propeller blades toward the feathered position (Beta Follow-up), yielding a lower windmilling propeller drag.
Here is what I do know: Engine oil drive the blades to low pitch and there is a spring that wants to feather the blades. With no oil the prop blades would go to feather. Above the flight idle the power levers control the manual fuel valve so how can pushing the power lever fully forward effect the blade angle?
Thanks in advance!
NOTE
In the event of an engine failure and an NTS system and/or feather valve malfunction, setting the power lever fully forward will drive the propeller blades toward the feathered position (Beta Follow-up), yielding a lower windmilling propeller drag.
Here is what I do know: Engine oil drive the blades to low pitch and there is a spring that wants to feather the blades. With no oil the prop blades would go to feather. Above the flight idle the power levers control the manual fuel valve so how can pushing the power lever fully forward effect the blade angle?
Thanks in advance!