nuckollsr(at)cox.net
Guest
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 Posted: Mon Mar 12, 2007 9:10 am Post subject: OV condition in old Bonanza |
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| Quote: | Comments/Questions: A good friend of mine has completed an RV6 and
recommended that you were the only one to answer my question.
I just replaced the voltage regulator on my A36 Bonanza that I have owned
for 20 years - 1977 E-1058 - The reason for the replacement was that we
had an over voltage condition that caused a number of avionics to fail. I
am trying to find out the cause of the failure, and if it was just a
failure of the regulator or anything else.
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Root cause was probably failure of the voltage regulator . . .
however, there are exceedingly rare but not zero risk that
some other defect in wiring or internal to the alternator
caused the ov condition.
A follow-up consideration is that the OV condition was permitted
to continue to an unhappy result because either (1) no OV protection
was installed or (2) the OV protection system was failed.
| Quote: | My question is: The charging system in this bonanza has a 3 amp fuse in
the alternator field wiring located on the engine side of the fire wall.
This fuse block is out exposed to the elements. The fuse holder brackets
holdding the fuse were noted to be corroded. My question is could the
corrosion have caused the regulator to not read the field voltage and
cause the "inductive kickback" or voltage spike.
We cleaned up the fuse bracket after installing a new Zeftronics voltage
regulator. But I need to know if this could happen again due to corrosion.
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If the system is operating normally after having replaced
the regulator, then failure of the original regulator is
mostly likely the root cause. Did your replacement regulator
come with OV protection built in? Does your system have
an OV protection devices installed that failed to function
earlier? I'll dig around in the drawings at Hawker/Beech to
see how the airplane was wired when it left the factory.
Corrosion at the fuse holder would not have caused an OV
condition.
Bob . . .
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( IF one wishes to be "world class" at )
( anything, what ever you do must be )
( exercised EVERY day . . . )
( R. L. Nuckolls III )
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