Is there an instrument to indicate this?
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2$\begingroup$ What type of aircraft are you interested in? The instrumentation of a new airliner is different from a glider, or a 1930's biplane. $\endgroup$ – Dan Hulme Aug 14 '18 at 12:33
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$\begingroup$ @DanHulme Would like to know what the commercial plane use $\endgroup$ – MisterClueless Aug 14 '18 at 12:41
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$\begingroup$ All the types of aircraft I mentioned are flown commercially. Are you asking specifically about airliners? $\endgroup$ – Dan Hulme Aug 14 '18 at 14:36
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For suction powered gyroscopic instruments there is usually some suction gauge to indicate the quality of the vacuum. See this question for more details in what the instrument shows.
