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Cruise Altitude Capture - Fluctuations Approx 200' Below

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When transitioning from SPD climb to capturing the cruising altitude at FL370-FL390 (the altitudes I tried this at), the CRJ's would seemingly level off 200' below, descend at 300fpm, then climb at 300fpm, and it'll keep doing that until I intervene. The displayed Autopilot Mode Annunciation is "ALT CAP" until I intervene and select V/S. After intervening, the altitude capture goes normally.


This only happens with relatively high cruising flight levels. I haven't observed the same behavior at lower altitudes (10,000-FL250).

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