I'm not an engineer or test pilot but I though some might find the following useful.

A friend of mine has a Lightning with a Jabiru/Bing installed.  His engine became erratic in cruise and even died when he pulled the throttle back.  He landed power on, on a long runway.  After much investigation he discovered that the balance tube between the intake plenum and the Bing carb had disconnected.  Reconnection solved his problem.

Moral of the story is:  secure that tube!

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His must have popped of during cruise.  My story starts on the ground.  The connection at the Bing is to a very small stub fitting.  I have knocked it off several times while doing work around that area.  Once I knocked it off during my phase 1 flight test period, didn't know realize it, and went flying.  Nothing out of the ordinary showed up during the run-up, and initial take-off, but on climb-out, I certainly noticed the engine was not happy.  It was running rough, but running none the less.  I turned back into the pattern and was able to make an uneventful landing.  I checked undercowl and found this line popped off.  I reconnected it and flew again immediately with no further problems. 


Indeed, the moral of the story is:  secure that tube!



I used safety wire to secure each end of the tubing ... just don't over-tighten it and cut the tubing.


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