1 Answers
Alternate Static Preflight Check
Asked by: NovemberGolf 3043 views Aircraft Systems, Commercial Pilot, General Aviation
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 shoud 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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