Mechanical Stall Warning??

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Vans have supplied the kit with two pilot holes ready for the Stall Warner Vane slot.

I have asked the LAA (Light Aircraft Association, UK) whether I will be compelled to fit a mechanical stall warner, since I plan to fit a pitot probe with AOA. This will of course be displayed on an EFIS with audio warning.

I suspect I’ll need to apply for an official modification, but in the meantime I’ve decided not to cut the slot. Instead I’ve machine countersunk the holes & fitted small OOP’s rivets.

If it turns out that I have to fit a stall warning vane after all, I’ll drill out the rivets and open up the holes to #10 as per the manual, and file the slot. Apparently there are several RV7’s & 8’s in the UK flying with no mechanical stall warner, so it bodes well, but fingers crossed

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I’ve prepared the brackets that attach the stall warning microswitch, and will also rivet the relevant nutplates to the left inboard LE rib just in case it has to be incorporated.

2 Comments on "Mechanical Stall Warning??"

  1. Bill Sweetnam | June 16, 2019 at 10:16 am | Reply

    Hi Steve… great blog!
    I’m on the home straight with my 14 QB tail dragger…full G3x ifr installation…
    Also wondering about the mechanical stall warner…did you ever get a ruling on this? Otherwise I’ll just leave wires in place and be able to fit later.

    • Hi Bill … thanks for your comment. I contacted the LAA who said the following … “In summary, yes, we’d be happy for you to use the Garmin AoA system in lieu of a mechanical stall warning device, subject to the test pilot confirming that it gives an appropriate/obvious warning of an impending stall and the visual component of the warning is also sufficiently clear.” They said they are planning to publish a Technical Leaflet about this topic, but I haven’t seen anything yet. I’ve sent you a private email with a little more info.

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