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I have been mulling over how to both secure my airplane as required by Australian law and making sure it’s safe from an accidental engine start. I want to ask for comments on my proposed solution.

I’ve done the first engine run. I set the motor control up with toggle switches (mil spec) per rotax advice because of reliability issues with key switches. I made a throttle lock and a lockable box over the switches.

Folks, the lockable box idea is inconvenient, ugly and messy. Furthermore if the switches are exposed, than anyone can at least turn the starter with awful results even if the engine won’t start because the throttle is locked. I do have grandchildren, as do friends, and one of these days I just know a kid is going to want to play when no one is around.

My solution is a SPST key switch in the starter circuit. The engine can’t be hand started. If the key switch fails, i’ll be on the ground anyway. unless they have the key, all kids can do is flatten the battery.

What are your thoughts?

  • Re: Security and Safety

    by » 5 years ago


    The key switch on the starter is a good idea to keep the average kid at bay.

    You will need an Off-ON-Start Switch.  The Start Power needs to be applied until the Lane lights extinguish before cranking begins.

    I have this type of wiring.  After engine start, the Key is returned to the OFF position to disable the Start Power Circuit.

    The key could be removed from the switch and the engine will remain running, but I leave it in place in case it might be needed for a restart in a hurry.

     

    If the backside of all these switches are reachable from behind the panel, the advance troublemaker will have little trouble hot wiring the starter anyway.

    Pulling the small wire Off the starting solenoid is easy to do and will defeat the starter.

    There will be no way even you will be able to forget the wire is off.

    No one is going anywhere until it is reinstalled.

     

    Your average troublemaker is in an automobile mindset.

    The one thing aircraft have that cars do not, is a Fuel Shutoff Valve.

    Be sure the Fuel Valve is closed and the key is inaccessible and you will stop 99.9% of the population.

    Especially the inebriated crowd.

    There will always be that One in a Thousand that you can do nothing about without an armed guard.


    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.


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