Answer by niels nielsen for What do a "sheared pump drive" and a "possible...
There is a small vacuum pump attached to the engine by a small rotating shaft which generates vacuum whenever the engine is running. That vacuum is used to spin up the gyro instruments in the...
View ArticleWhat do a "sheared pump drive" and a "possible sticky vacuum regulator" mean?
The POH for a PA28 (engine driven vacuum pump) says a decrease in pressure on the gyro suction gauge may indicate a possible sticky vacuum regulator. A zero pressure indication means a sheared pump...
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