Stall Warning Circuit Breaker -- Pitts S-2A

Discussion in 'Pitts Miscellaneous' started by cwilliamrose, Mar 20, 2018.

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  1. Mar 20, 2018 #1

    cwilliamrose

    cwilliamrose

    cwilliamrose

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    What are all you S-2 owners doing to defeat the stall warning? My circuit breakers do not make it possible to kill the circuit manually, the buttons are flush when engaged and there's nothing to get a hold of. When I have it apart for the annual I'd like to improve that situation so I don't have to use tape on the stall warning wing switch.......
     
  2. Mar 20, 2018 #2

    PittsDriver68

    PittsDriver68

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    I opened the panel behind the head of the front seat passenger, found the wire to the horn, and installed a wrist-lock connector in that line. I then separated the two halves of the connector and put heat shrink over them so that nothing would short out. At annual time I explain that to my friendly AI and if he insists, I demonstrate that the system can work. Then I disconnect it again.

    The funny thing is that when I had my ship recovered, the guy who did the fabric said "I did you a favor and disconnected the stall sensor out in the wing." Of course I laughed and explained that the horn was already disconnected. Have not had to fish out there and re-connect it yet.

    Best of luck,

    Wes
     
  3. Mar 20, 2018 #3

    cwilliamrose

    cwilliamrose

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    Thanks Wes, that's a good solution. Is there an option for a more user-friendly CB to replace the original? Without a stack of mandatory FAA paperwork of course.....
     
  4. Mar 20, 2018 #4

    smizo

    smizo

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    Replace the flush breaker with a Klixon one........
     
  5. Mar 20, 2018 #5

    cgzro

    cgzro

    cgzro

    Peter Ashwood-Smith P

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    Other options. 1- Little drop of clear Silicon sealant on the top of the vane, or 2- a bit of thread between the two screws and over the top of the vane.
     
  6. Mar 20, 2018 #6

    EAABipe40FF

    EAABipe40FF

    EAABipe40FF

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    In WV nothing but Duct tape is approved:rolleyes:

    Jack:D
     
  7. Mar 20, 2018 #7

    PittsDriver68

    PittsDriver68

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    I grew up where flying around with pulled out circuit breakers was severely frowned on. Look up "normalization of deviance". Much better to implement a hidden and easily reversible "hack". The thread on the vane might be easy and inconspicuous enough. I will suggest that tape on the vane is too easy to spot.

    Best of luck,

    Wes
     
  8. Mar 20, 2018 #8

    cgzro

    cgzro

    cgzro

    Peter Ashwood-Smith P

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    3- Take a few flies, mush them up and stick them in the vane slot:)
     
  9. Mar 20, 2018 #9

    Captain Scarlet

    Captain Scarlet

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    I cannot believe the authorities are so lunatic as to require a stall warner on ANY aerobatic machine, especially one with a fully inverted systems capability...
    Sheer madness!
     
  10. Mar 20, 2018 #10

    cgzro

    cgzro

    cgzro

    Peter Ashwood-Smith P

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    You should fly a glass cockpit Extra 330LT. It flashes all kinds of warnings at you. Super annoying. At least the Pitts is so noisy you really cant hear the warning anyway:)
     
  11. Mar 20, 2018 #11

    Morphewb

    Morphewb

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    It also has a mandatory alternate static system activated by the standard Mk 1 radiator drain valve.

    Same type of idiotic regulation that brought the bungee spring trim system on the Husky. I did notice recently on the Aviat web site a 2018 Husky sporting a trim tab on it's elevator. Anyone know about that?
     
  12. Mar 20, 2018 #12

    cgzro

    cgzro

    cgzro

    Peter Ashwood-Smith P

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    Well at least that alternate static has one good use, a convenient way to hook to static during a transponder check. Just tape up the static ports on the pitot head and away you go. The stall warner is totally useless.
     
  13. Mar 20, 2018 #13

    cwilliamrose

    cwilliamrose

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    Thankfully I didn't receive that same schooling. :) I'd rather be able to just push a button to be in full compliance.

    Anyway, if I were to replace the Tyco W58XC-4C-12A5 with a similar Tyco W23-X1A1G-5 or even an equivilent Klixon CB, would that require anything more than a logbook entry?

    Interesting. I would think "normalization of deviance" would apply whether the deviance was visible or not because you know it's there.........

     
  14. Mar 20, 2018 #14

    wzm

    wzm

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    Is the horn unpluggable? That's what I've seen done before on other planes, if you can do it that way you don't need to pop any circuits or tape up the switch.
     
  15. Mar 20, 2018 #15

    cwilliamrose

    cwilliamrose

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    I don't know how it's wired in the wing, that could be another option. Thanks.....
     
  16. Mar 20, 2018 #16

    cgzro

    cgzro

    cgzro

    Peter Ashwood-Smith P

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    Its trivial to disconnect the switch in the wing. Two screws to remove it then just disconnect one of the leads from the switch. Make sure to insulate the lead you disconnect. Its a 5 minute job max.
     
  17. Mar 20, 2018 #17

    Tomcat

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    As long as the new CB'r is "as good as or better" than the original from a functionality standpoint, and it comes with an 8130-3 tag or has a PMA number you can replace it and cover it with a simple log entry.
     
  18. Mar 20, 2018 #18

    wzm

    wzm

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    I was actually referring to the horn itself, that way you've unplugged it at the panel, and it's easy to reconnect before annuals. The switch in the wing would work too.
     
  19. Mar 20, 2018 #19

    cwilliamrose

    cwilliamrose

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    I assume this one has a PMA number since it has p/n from three airframe manufacturers;

    Capture.JPG

    But how would I prove that?
     
  20. Mar 20, 2018 #20

    TFF1

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    If it fits the hole, kick the CB around in the dirt, stick it in, and pretend it has been there forever. If the quality of work is equal or better than the factory, and with the possibility of small changes during production of what is a custom aircraft, only your buddies will know. The FAA guys don't know. As for documentation, either write it in as generic as possible, and play dumb if you get challenged or don't put anything in. Undocumented what? You are trying to defeat a safety feature no matter what you do!
     

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