Simviation Forums

Posted: **Tue Oct 27, 2009 8:05 pm**

At what altitude should you switch from IAS to MACH or is it variable?

Posted: **Tue Oct 27, 2009 11:35 pm**

FL180 is the standard I believe.

Posted: **Tue Oct 27, 2009 11:48 pm**

Climb at normal IAS climb speed, till you reach cruise mach, then hold that mach number even if you are climbing.

Posted: **Wed Oct 28, 2009 8:07 am**

Thanks all. That answers my question.

Posted: **Wed Oct 28, 2009 2:51 pm**

Does it make much difference though? Or is it just the done thing?

I've never heard of needing to switch to .mach at a certain speed or altitude.

Posted: **Wed Oct 28, 2009 3:16 pm**

Does it make much difference though? Or is it just the done thing?

I've never heard of needing to switch to .mach at a certain speed or altitude.

LOL , I know is for important heavies and general jets has it for a very important reason ,I mean at FL180 the indicator has to be switch from IAS to Match, ::)

but to be honest I never dear to ask ,but now that the subject is on ,why do we have to do that? ::)

please be nice :P

Posted: **Thu Oct 29, 2009 8:39 pm**

because mach is a more reliable speed indicator at high altitudes than ias is

IAS gets inaccurate at high altitudes due to thinner air

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