Is there even the slightest possiblity (Aircraft Electrical question)

Discussion in 'Maintenance Bay' started by FlySince9, Jan 19, 2019.

  1. FlySince9

    FlySince9 En-Route

    Joined:
    Mar 7, 2011
    Messages:
    2,834
    Location:
    Huntersville, NC
    Display Name:

    Display name:
    Jerry
    I recently started having a weird problem with my radios. When I power up the radios after engine start, I try to call Ground and they can't hear me (they report garbled/unreadable). After several attempts I can get enough thru to them that I get cleared to taxi to the runway... By the time I get there, do my runup and call tower for departure, the trouble seems to have cleared and the tower doesn't complain about any problem with readability. After the initial trouble there doesn't seem to be an issue with any radio communications.

    So Monday, my solenoid craps out and its now been replaced. I haven't had the opportunity to check to see if the radios are still having issues yet, but is it possible that the solenoid was putting noise on the ground connection and interfering with the radios.
     
  2. Juliet Hotel

    Juliet Hotel Line Up and Wait PoA Supporter

    Joined:
    Jul 21, 2018
    Messages:
    621
    Display Name:

    Display name:
    Juliet Hotel
    Stupid question. Does the plane sit outside? Any chance you're getting some moisture in the radio that has to dry off as it heats up?

    One of the work Supercubs I used to fly had a leaky windscreen and if it rained, water would pool inside the radio. I used to keep a radio screwdriver in the plane. If the radio didn't transmit or receive after startup, I'd turn it off and use the screwdriver to pull it out of the tray. I'd hold it out the window with the end turned toward the ground until the water stopped coming out. Then I'd put it back in the tray, power it up and it would work fine.
     
  3. FlySince9

    FlySince9 En-Route

    Joined:
    Mar 7, 2011
    Messages:
    2,834
    Location:
    Huntersville, NC
    Display Name:

    Display name:
    Jerry

    LOL ... Yea, its outside but it has an extended Canopy cover on it so doubt any real moisture can get in there... Thanks..
     
  4. eman1200

    eman1200 Touchdown! Greaser! PoA Supporter

    Joined:
    Mar 10, 2013
    Messages:
    10,812
    Display Name:

    Display name:
    eman1200
    you're welcome.

    deleteme.jpg
     
  5. weirdjim

    weirdjim En-Route

    Joined:
    Jul 8, 2008
    Messages:
    3,608
    Location:
    Grass Valley, CA (KGOO)
    Display Name:

    Display name:
    weirdjim
    At this time of the year, more probable a component that doesn't like the cold warming up as the cabin warms up. Most of us that do troubleshooting like this keep a squeeze bottle of Freon on the test bench to "hit" parts that we suspect. After, of course, a lot of signal tracing to isolate the problem to one circuit.

    The alternative to this is put the radio in the fridge overnight and then touch one component after another with a hot soldering iron.

    Jim
     
  6. FlySince9

    FlySince9 En-Route

    Joined:
    Mar 7, 2011
    Messages:
    2,834
    Location:
    Huntersville, NC
    Display Name:

    Display name:
    Jerry
    Its a 430W... not putting that in the fridge... LOL
     
  7. unsafervguy

    unsafervguy Cleared for Takeoff

    Joined:
    Aug 16, 2011
    Messages:
    1,325
    Location:
    Sw florida
    Display Name:

    Display name:
    bob
    using the F word in California? im sure the California EPA types will be knocking on your door momentarily.........
     
  8. ircphoenix

    ircphoenix En-Route

    Joined:
    Feb 29, 2016
    Messages:
    2,510
    Location:
    Redondo Beach, CA
    Display Name:

    Display name:
    ircphoenix
    It's not the real stuff. It's the R134A that plants crave.

    Sent from my Pixel 3 using Tapatalk
     
    flyingcheesehead likes this.
  9. Lantraxco

    Lantraxco Pre-takeoff checklist

    Joined:
    Dec 23, 2018
    Messages:
    138
    Display Name:

    Display name:
    OldNewbie
    Got a voltmeter in the panel anywhere? Could be the battery is dropping badly during the start and it takes a while for the charging system to bring the voltage back up. Bad connections, especially poor grounds can cause similar symptoms.
     
  10. Skyrys62

    Skyrys62 Pattern Altitude PoA Supporter

    Joined:
    Apr 5, 2017
    Messages:
    2,223
    Location:
    Owensboro, KY
    Display Name:

    Display name:
    Meet the Fokkers
    Let the wife know you need a new plane.....it's the only safe choice.