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Thread: Lost Comm and lighting

  1. #1

    Lost Comm and lighting

    Sounds more like you're going to need to go out and get some
    new wiring installed...you can't really run it that way anymore.
    That would explain your breaker popping...your alternator probably
    was pushing max power into whatever was drawing it. If the
    batter was 100% dead, perhaps you have a shorted cell (rare), but
    whatever was the ultimate cause of this issue is what you need
    to find and fix first and foremost.

    Also, did you lse the GPS comm and intercom when the breaker
    blew, or before? If you lost them before, I'd think that
    you have some major short somewhere in the system...very
    major...enough to take your system voltage down low enough
    to lose those radios. The fact that you turned the breaker
    on and things came back to life later kind of tells me that
    A) Whatever was shorted just melted itself away so the short
    was gone and B) the alternator blew, but the load was still
    there, which drew your battery down to nothing while having
    something get VERY hot somewhere in your airframe.

    If I were you, I would not even think about flying this plane
    again until you find the charcoal. Look in the engine
    compartment, behind the firewall, in the tail by the battery,
    and if you don't find it in those places, pull every
    inspection panel until you do find it. If the alternator
    wires were melting down, I would bet that you'll find some good
    evidence wherever the flaw lies.

    Just my 2 cents.

    Tim

    jm8995 wrote:
    > Flying yesterday, I lost my GPS comm and intercom. Alternator breaker
    > pops out. Initially, I did not reset it. Turned off all strobes,
    > beacon and position lights and alternatre switch. I then let the
    > plane run awhile while heading back to the airport. Reset the
    > breaker, turned the switch on and radios came back to life. I kept
    > her high so that I could make the field at the airport circled the
    > field to loose altitude and landed no problem.
    >
    > On the ground battery is totally discharged. I noticed that the wires
    > to the direct drive alternator were coated in Silicon and were
    > beginning to show exposure. Also where the wires connected, the bolt
    > and conector were rusted.
    >
    > Should I just go out and buy another alternator?
    >
    >


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  2. #2

    Lost Comm and lighting

    Tim Olson is right, in that this one ought to be sorted out before
    flying again. If just the alternator went, I wouldn't expect to see
    wiring damage. More than that, the rust and wire insulation can be
    big clues. Corrosion in wire connections (or less commonly, in the
    wire itself) has been found by the military to be one of the biggest
    problems in readiness and loss of equipment. Basically, a destructive
    loop is set up, in which the corrosion creates resistance, creating
    heat, the heat creates more resistance. Meanwhile, the charging
    system is increasing output to get through the resistance. The lowest
    temperature rating I know of for an aircraft wire is 150 degrees C,
    and most are 200C+. This means that if you can find insulation
    damage, the wire temp likely went well over those values (there are
    margins over the ratings).

    Bob
    A&P, Aero Eng

    --- In musketeermail@yahoogroups.com, "jm8995" <jm8995@y...> wrote:
    > Flying yesterday, I lost my GPS comm and intercom. Alternator
    breaker
    > pops out. Initially, I did not reset it. Turned off all strobes,
    > beacon and position lights and alternatre switch. I then let the
    > plane run awhile while heading back to the airport. Reset the
    > breaker, turned the switch on and radios came back to life. I kept
    > her high so that I could make the field at the airport circled the
    > field to loose altitude and landed no problem.
    >
    > On the ground battery is totally discharged. I noticed that the
    wires
    > to the direct drive alternator were coated in Silicon and were
    > beginning to show exposure. Also where the wires connected, the
    bolt
    > and conector were rusted.
    >
    > Should I just go out and buy another alternator?




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