June 7, 20178 yr Hello all! Just picked up the 550 a day ago, and I am having an issue holding a steady altitude with the default AP- The aircraft will porpoise +- 500 FPM while trying to hold a set altitude...is this a known issue? Jon Richardson Raleigh, NC
December 4, 20178 yr I am having ctds just changing interior views which is a pita. No issues with the ap YET but on the Phenom I was having all kinds of problems holding altitude. May not be your problem but mine was I had the TRIM set to a TM Warthog throttle wheel. During trouble shooting I removed it and all is well. I now use a hat switch on the stick. I no longer ask WHY it works but just that it solved it. Maybe try to remove your elevator + and - and see what happens.
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