John,

 

If you are going to be more comfortable with a backup pitot tube, why not just plumb it to a second airspeed indicator?  Will you have pitot heat on both?

 

The AOA system I use relies on 4 inputs - upper and lower wing pressures, pitot and static.  If I wanted an airspeed backup I would install another heated pitot and a dedicated line to a separate AI in order to keep it simple.  Otherwise, I am just going to rely on known power settings cross checked with GPS ground speed and how quickly the clouds or trees are going by.

 

Scott Krueger

 

Greetings,

 

I will have an AOA in my Legacy. 

 

That said, I am concerned that if for some reason my pitot tube gets blocked by something like an insect, bird, or other debris, my airspeed indicator will probably be giving me an erroneous reading. 

 

Would not this error also be reflected in the AOA?

 

Therefore, would it not be a good idea to have the AOA on its own pitot source?  And could one tie both pitot tube together so that if one was blocked, the other would continue to provide pitot pressure?

 

Thank you in advance for your input.

 

John Kleber