Loud gyroscopic instruments

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Flight school just replaced the DG in one of its Cherokees. Now the gyro is loud as hell. At least, it's much louder than it used to be! Are some gyros just loud, or can one be so loud as to be considered defective???
 

erj-145mech

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Noise is not disqualifying a gyro from service. Noise could be a bad or soon to be bad gimbal bearing, and that would cause excessive progression. How often do you have to set the heading? Noise could also be a case thats not totally sealed, which will draw in unfiltered air and cause a gimbal bearing failure due to FOD.
 

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erj-145mech said:
Noise is not disqualifying a gyro from service. Noise could be a bad or soon to be bad gimbal bearing, and that would cause excessive progression. How often do you have to set the heading? Noise could also be a case thats not totally sealed, which will draw in unfiltered air and cause a gimbal bearing failure due to FOD.
Yeah, the new DG does not seem to hold the actual mag heading as well as the old one did. In fact, durring some pattern work, my instructor told me to "make a 90-degree turn", instead of calling out the actual heading like he usually does. Kinda funny. Chances are, before long that DG may be swapped out again.
 
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