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Fligh Manual Limitations

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The yellow arc is for A\C with a one piece tail rotor drive shaft.  Since one gauge almost fits all, the yellow arc will not be removed.  Just imagine the paper trail to remove that one marking.


Still know of a least one 206 with a straight drive shaft.

Uh...WTF....did you take your Allison (back then), and 206 course when there were C-18's installed? :rolleyes:

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correct me if i'm wrong but wasn't the yellow arc for resonant turbine wheel vibrations?


The yellow arc is for the one piece T/R shaft as mentioned, the range for the resonant turbine wheel vibrations was somewhere between 95-97%, I believe those wheels have all been replaced by now.


Quite a few jetrangers around with the single piece T/R driveshaft, and it's still a good idea to accelerate thru the yellow arc in case you arent sure what kind of shaft is on the machine AND because the Flight Manual tells you to do so.


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