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Alternate static source check

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NovemberGolf created the topic: Alternate static source check

G'day,

Why is it that when checking the alternate static source on an aircraft like a C172, a momentary change in indication is noticed in the altimeter and VSI but not the Airspeed indicator? I have so far assumed it's down to the sensitivity threshold of the instruments.

Additionally if this check is done when stationary on the ground then the static pressure should be the same both inside and outside the cockpit correct? why then is a momentary change noticed at all on any instrument when testing the alt static source?

Cheers
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