Last Saturday I shut down our Rotax 914F turbo. (Super Dimona TTC)
Suprise: when I shut down the right-magnet, the engine stoped. (It should run further on the left-magnet!)

Another suprise: when we repeated the same with 1600 rpm, the same problem. When I shut down the right-magnet the was a decrease of 100 rpm. But when I turn the key one step further to the left, the engine stoped!

The engine started inmediately afterwards and this phenomenon was'nt seen anymore. On Sunday we flew without any problems.

But I am a littlebit worried. What could cause the unexpected shut-down? And can we expect some more suprises of this kind? Especially high above the groud?

Who can give advice?

Thank you in advance.

Kind regards,
Gerard Hanstede,
The Netherlands.
  • Re: engine shuts down

    by » 6 years ago

    Could be a defective ignition switch or faulty wiring causing your "left" ignition to be off-line and not operating? You may be flying around with only the "right" ignition operating? Check your switch and wiring.

  • Re: engine shuts down

    by » 6 years ago

    I am going to assume that you do a MAG Check before every flight.
    That would mean the Switch is probably good as the common failure mode is OPEN Circuit which would mean your problem would be the engine would not shut OFF.
    If you are getting an intermittent ground, I would suspect wire chaffing.
    Trace the entire length of the Left Ignition wire to confirm that the insulation is not allowing the conductor to contact the frame at any point.

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

  • Re: engine shuts down

    by » 6 years ago

    Thank you for your quick responce!
    I am glad that you don't suspect the coils.
    I wil check the wires and keep you an informd.

    Kind regards from a cold and drizzeld Netherlands.

    Gerard Hanstede

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