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C172 RG overvoltage

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Old 06-18-2007 | 01:50 PM
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From: CRJ900
Default C172 RG overvoltage

Anyone know how big the overvoltage protection is? I thought it was 35 or 33 but thats in the P model so i need to find the RG. ANy one know?
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Old 06-21-2007 | 09:18 AM
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I've got the POH at home, but I am not sure what you are after; overvoltage for a breaker to trip? Which one? Or maybe for the voltage regulator? What prompted the inquiry might help also.

Last edited by Cubdriver; 06-21-2007 at 09:29 AM.
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Old 06-21-2007 | 09:40 AM
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He's looking for the high voltage at which the VR will shut itself down (it will then give you a low-voltage light because it's making no voltage).

It's not in the POH, you probably need to ask a mechanic because their Mx manuals will have the value for testing/adjusting purposes.

It is almost certainly in the 33-35 volt range however, that would be typical for a 28V system.
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Old 06-22-2007 | 08:58 PM
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Sorry if I was not very clear but it was the VR. I wondered because I was asked this on my instrument ride and couldnt remember for sure what it was since I have a CSEL coming up in the very near future. Thanks for all the help VERY much appreciated!
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