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Air speed indicator

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Joined
Feb 7, 2019
Messages
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Recently replaced the Pito Blade on my 1973 PA-28-140. I had the avionics shop do the static check for vacuum leaks & everything looked good. Now, a couple of weeks later the Airspeed indicator needle has been vibrating, & two days ago it was jumping up & down, ten to twenty mph. Coincidence, or is this a symptom of a leak?
 

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