Results 1 to 5 of 5

Thread: help Electrical problems

  1. #1

    help Electrical problems

    Help
    1978 Sundowner
    The main breaker (50A) kept popping so I had the shop test eveything and we
    concluded a week breaker so we replaced it with a new one from Beech. Went up
    on a Night IFR pre Check ride with a new instructor, loaded everything up on
    the first two flights, no problem. Then last night went up again and pop goes
    the breaker. Instructor gets excited and had me retuned to base. We were up
    less then an hour when the main breaker popped.
    Shop said they loaded everything and it was only drawing 40 Amps and alt was
    putting out fine.
    Does anybody have any ideas on where to start looking?

    Bobby
    78 Sundowner
    N5161M



    [Non-text portions of this message have been removed]



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Help save the life of a child. Support St. Jude Children's Research Hospital's
    'Thanks & Giving.'
    http://us.click.yahoo.com/6iY7fA/5Wn...ZIAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links

    <*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/musketeermail/

    <*> To unsubscribe from this group, send an email to:
    musketeermail-unsubscribe@yahoogroups.com

    <*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

  2. #2

    Main Breaker Popping

    Please post a list of every single item that is being turned on during the load testing on the ground.

    Had anything just been touched or changed shortly before the most recent circuit breaker pop? Had the transmit keey been pressed? Anything at all?

    It is also very possible to get a bad breaker out of the box. What brand and model number did you get and install?

  3. #3

    help Electrical problems

    Bobby,
    Some detective work is in store, as well as some very fine inspections.
    Start at the CB and work back toward the equipment tied into it. Look for
    burnt or charred residue on the wiring or the frame. It sounds to me like an
    intermittent problem...a loose wire or hot lead making contact with a ground
    somewhere along the route. Check connections first. 78 Sundowner? Wires are
    nearly 30 years old and the insulation could be getting brittle and cracking
    allowing a short to ground at a connection or within a wiring bundle. If on
    preliminary inspection, nothing is obvious, you may want to untie your wiring ties
    and separate wires; again checking for discoloration, cracks in the
    insulation, or charring as a result of arcing. Since it happens in flight, my guess is
    it is something loose or rubbing from the vibration.
    On the other hand, it could be a faulty CB. Just because it is new,
    don't rule it out; especially since the draw on the system is only 40 amps.
    Disconnect your battery at the battery terminal BEFORE starting this
    and, of course, remove your rings and watch. You'll be surprised how quickly
    cracks in the wiring show up when you're moving wires around and your wedding
    band makes contact. 40 amps will probably do more than char your ring and
    discolor your finger and what it does to the LED in your watch...it will burn
    bright, for a moment. But, unlike an analog watch, it won't even be right twice a
    day <grin>.
    Good luck,
    Chuz


    [Non-text portions of this message have been removed]



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Give the gift of life to a sick child.
    Support St. Jude Children's Research Hospital's 'Thanks & Giving.'
    http://us.click.yahoo.com/5iY7fA/6Wn...ZIAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links

    <*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/musketeermail/

    <*> To unsubscribe from this group, send an email to:
    musketeermail-unsubscribe@yahoogroups.com

    <*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

  4. #4

    help Electrical problems

    My landing light CB used to pop all the time after about 5 mins or op, then
    every min or so.

    Replaced the breaker (after checking the bulb wattage and wiring) and all is
    well. CBs do go soft after a while especially when operating near the trip
    current.
    Dr Bill
    76 Sundonwer
    N9230S



    [Non-text portions of this message have been removed]



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Give the gift of life to a sick child.
    Support St. Jude Children's Research Hospital's 'Thanks & Giving.'
    http://us.click.yahoo.com/5iY7fA/6Wn...ZIAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links

    <*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/musketeermail/

    <*> To unsubscribe from this group, send an email to:
    musketeermail-unsubscribe@yahoogroups.com

    <*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

  5. #5

    help Electrical problems

    Does anybody have any ideas on where to start looking?

    [AP: ] [AP] No but lots of sympathy. Goint through similar at the
    moment. Painful, expensive and slow.

    -ALlan Palmer
    Brisbane, Australia


    [Non-text portions of this message have been removed]



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Give the gift of life to a sick child.
    Support St. Jude Children's Research Hospital's 'Thanks & Giving.'
    http://us.click.yahoo.com/5iY7fA/6Wn...ZIAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links

    <*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/musketeermail/

    <*> To unsubscribe from this group, send an email to:
    musketeermail-unsubscribe@yahoogroups.com

    <*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

Similar Threads

  1. Electrical Short?
    By PeterD in forum Musketeer-Mail Archive
    Replies: 3
    Last Post: 06-02-2006, 06:23 AM
  2. Electrical Problems
    By sjcote in forum BAC Mail Archive - DO NOT POST HERE
    Replies: 5
    Last Post: 05-08-2006, 10:33 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO