"Sriram Narayan" wrote in message
news:1105574315.223629d9c9b6178c7b6b555f5ecac8c3@t eranews...

"Gary Drescher" wrote in message

Hm, shouldn't a blocked static line cause the airspeed indicator to show
an
increase in airspeed, rather than a decrease, with increasing altitude?


It would indicate a lower airspeed.

The pitot ram air pressure for a given airspeed decreases with higher
altitude. If the static port were blocked (at say, the takeoff altitude),
the airspeed would "indicate" a lower airspeed since the pitot pressure
has
dropped for that airspeed as the plane gains altitude. As another poster
commented, the only altitude where the ASI is accurate is at the altitude
where the blockage occurred.

Oops. Yes, of course. Thanks.

--Gary