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Subject: Gyro spool down time question from a pilot.
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D24112User is Offline
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JH Newbie
Posts:4

05/27/2009 7:01 AM  
In a previous life in the military we would never move an aircraft for at least 20 minutes after shut down to give the gyros a chance to spool down to prevent damage. In the EMS world it seem as though this practice is never given a thought. Its it necessary?
oldwarriorpilotUser is Offline
JH Member
JH Member
Posts:22

05/29/2009 12:10 PM  
The old military gyros did not have an integrated limit stop which basically cages the gyro when power is shut off  to the unit.

Most newer gyros do have limit stops so it is safe to move the aircraft around without haveing them pound against the internal stops.

If you really want to know for certain, get the PN and call your local repair shop.

was once bold, now just old
BirdUser is Offline
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Posts:1

03/04/2010 9:50 AM  
Both JET and C-14's required a minimum of 15 minutes. Be safe and go to 20-25. If you do need to move, use an external source to keep them powered until the aircraft is stopped. This will cure a lot of gyro issues!
KapMechUser is Offline
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Posts:4

08/05/2010 8:26 PM  

Outside of the Army, I have not seen a gyro go bad if someone towed a helicopter without waiting 15-20 mins. However I wouldn't want to be that guy who has a gyro crap out on him because he didn't let it spool down or didn't want to keep the battery on for the extra few mins it takes to tow it back into the hanger.

Artificial horizons are not cheap. Try explaining that to a customer who feels he doesn't have to pay for a new one because you decided it was fine to move without waiting or keeping the power on.

I recall having a rash of gyro problems due to improper caging by the pilots. Instead of pulling the cage knob and releasing it smoothly, they were simply letting it snap back. For weeks, I couldn't keep an artificial horizon working and was blowing through them like candy..until one day I caught the pilot doing it and promptly explained to him and showed him the correct way to cage a gyro. After that, my gyros started to last a bit longer..
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