The Prop Rpm gauge has two red zones.

One red zone has green zones on either side.

 

What warnings are the two red zones indicating?

 

 

 

 

How about I tell you what the two green zones represent and that will make the two red zones much clearer.

 

Look at your power quadrant, for the Carenado airplane you will need to push the power levers forward some. The first position you will see, right across the "TRI" in trim is the flight idle position. It is labeled IDLE. In the box below that you see the words LIFT. When you pull the power levers to idle this is the flight detent position. In the real airplane if you just slightly pull up on the power levers you will enter the GROUND FINE position. The lower of the two green arcs represents the propeller operating in this ground fine taxi range.

 

The second green arc is the normal operating range of the primary governor, 1400-1700. Since the area between 1250 and 1400 is not normally a governed propeller position it is marked red as a transient zone. You don't want to see your propellers hanging around in this area.

 

So the lower red arc well that is our avoid range with the engine running while taxing. Its OK for the propellers to transit this range  during engine start and shutdown (and when feathering a prop!)

 

Ground Fine operates the propellers between +7 and -2 degrees pitch, full reverse is -14 degrees pitch. Flight idle is +13 degrees pitch.

 

Ken,

 

Thanks.