PPRuNe Forums - Why Does Vmo decrease with Altitude

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concordino

18th Feb 2003 20:18

Why Does Vmo decrease with Altitude

I am looking at B1900D flight training manual and it says:
Vmo is 245 from Sea level to 13500 feet
and decreases to 195 from 13500 feet to 25000'
Why is that so ?

many thanks in advance

Squawk7777

18th Feb 2003 21:59

The King Air 200's ASI has a Vmo bar that does change with altitude. That is a basic form of a mach meter. I am not sure about the 1900's ASI.

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