Why does the overspeed limit go down as altitude increases over FL260

I want to know why. It just does not make sense.

Thank you!

1 Like

Because the air is thinner

It’s quite the complex thing, but ol’ @Brandon_Sandstrom composed this tutorial back in the days per my request to explain it all better:


thanks a lot

GS has no bearing on the aircraft only dynamic pressure as you will come to understand by reading the tutorial @schyllberg posted.

1 Like

This statement is wrong.

Someone needs to read the tutorial it seems ;)


Also incorrect the only reason you see a decrease in the IAS limitation above FL280 is because you are transitioning to Mach speed and reaching that limitation before the other.


Just realized the issues with that statement, ouch.

1 Like

Because the airspeed limit is higher than the mach limit so the mach limit takes over.

This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.