B: RE: Intermittent Tach & power outlet question
BobsV35B at aol.com
BobsV35B at aol.com
Wed Feb 27 11:09:47 EST 2008
Good Morning Michael,
The correct answer is that It All Depends!
If you will provide your serial number, John Collins could probably tell you
what it was when it left the factory, but many have been modified so that is
not a sure bet.
Some Barons were equipped with a standard twelve volt cigar lighter. Beech
installed a resistor in series with that outlet that had about the same
resistance as the cigar lighter. If you check the no load voltage with a volt
meter, it will show the full twenty-eight (or twenty-four if the alternator is
not running) volts, but the resistor will drop the voltage appropriately when
it is loaded with the stock cigar lighter.
Unfortunately, many folks tried to use the cigar lighter outlet for other
purposes and since the resistor was not likely to be sized to accommodate the
new load, the voltages were not what was expected. The later airplanes use a
special (read for a truck) cigar lighter and there is no resistor in the
circuit. It is my understanding that many folks have removed the dropping resistor
and not made a notice to that effect in the ship's papers.
I think it would be pertinent to do a little sleuthing with Volt/Ohmmeter to
find out just how your individual outlet is wired.
Check the size of the wire and the circuit protection to see how much
current can be safely carried by that circuit.
In any case, if the circuit is still wired as it came from the factory,
there should be no potential for a fire!
628 West 86th Street
Downers Grove, IL 60516
Brookeridge Air Park LL22
In a message dated 2/27/2008 9:49:57 A.M. Central Standard Time,
mitchell at policetrust.com writes:
1979 Beech Baron B55 IO470
Intermittent Tach, we have experienced varying degrees of Tach issues. The
mechanics have cleaned and secured the "cannon plugs" which offered
temporary relief. At this point the left seems to function at 99%, while the
right does not come alive until run up.
Power outlet, does anyone know what the voltage is for the DC outlets are in
the Baron? Additionally, what type of sustained load will these outlets
take. I'm wanting to hook up a small inverter to run a laptop on a 3-4 hour
flight. Any concerns about load (fire) ect.
Thanks in advance for the responses.
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