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Lane B Flashing

in 912iS Technical Questions 6 years ago
Last couple of flights I've experienced a Lane B flashing after starting a descent. Tonight I had the engine page up on the MFD and noticed my cylinder 2 EGT temp drop significantly after reducing power. I suspect that is the cause. Once I added power, the temps came back up. I'm scheduled for a BUDS download tomorrow. What does the group think? Failing/loose EGT sensor?

Aviation Real Estate Specialist & iRMT

  • Re: Lane B Flashing

    by » 6 years ago

    Or you may just need to go into the menu of the instrument and lower the EGT lower alarm set point. When you pull back power to idle in the air you have no control of the EGT temps.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: Lane B Flashing

    by » 6 years ago

    Or you may just need to go into the menu of the instrument and lower the EGT lower alarm set point. When you pull back power to idle in the air you have no control of the EGT temps.


    I see your point, but why is this an issue now? I have over 500 hours on the engine and this is a recent development. And why only on cylinder #2? All other cylinder temps remain in the green. I guess the BUDS D/L will reveal the cause...

    Aviation Real Estate Specialist & iRMT

      
    Report

  • Re: Lane B Flashing

    by » 6 years ago

    You originally said EGT then went to CH. Are we talking EGT (exhaust gas temp) only or CHT (coolant temp)?
    If you have 500 hrs. without an issue on #2 EGT then the instrument settings aren't the problem.
    How old is the engine? Maybe a lose connector on #2? Unplug #2 connector and plug it firmly back and and fly again.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
    Report

  • Re: Lane B Flashing

    by » 6 years ago

    I notice the same thing (unusually high EGT spreads) with long power off emergency descents (idle for long descents) that trigger a flashing lane light. Since I know what the problem is I simply switch off the lane and back on and problem solved. Everything back to normal. Generally to avoid this I do the long descents with some throttle. Note flying in the mountains these can be at 12,000 to 5000 MSL and temps well below freezing.
      
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  • Re: Lane B Flashing

    by » 6 years ago

    Isn't 500 hours about the time one might expect an EGT sensor to go bad?
      
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