1. 840
Propellor

3. Basic Prop Control ON-Speed
Flyweights
Pilot-Valve
Speeder
Spring

4. Ports Prop to Gear-case
Basic Prop Control
OVER-Speed
Pilot Valve
Blocks Oil,
Ports Prop to Gear-case

5. Basic Prop Control UNDER-Speed
Pilot Valve
Blocks Oil Dump,
Ports Oil to Prop
Note Port in Beta Tube

6. Basic Prop Control Low-Pitch Stop
Propeller Piston &
Beta-Tube Move Forward
Beta-Tube Port Blocked

7. Basic Prop Control
Low-Pitch Stop
Beta Light

8. Prop Feather

9. NTS
Not Active
Negative-Torque
Port

11. Do you like what you’ve see so far?
Do you want to see the rest
of this system presentation?
Send me an at
for information on how to schedule
a Commander course tailored
to your training needs.