Enroute to the AAMMO intersection when I selected the runway for landing in KDTW and the autopilot on NAV mode instantaneously made a 45 degree bank turn to the left sending the plane off course, but NAV mode was still engaged. The MCDU still showed direct AAMMO, but I had to go to select DIR INTC and input a direct course to AAMMO and the plane eventually got back on course. The plane was still level at 15,000 ft.
This is nothing new, but I wonder when the 717 does this, why always a hard immediate bank to the left? Since something in the programming of the 717 is still a bit off, why not a wrong turn to the right?
P.S. The MCDU still has a font problem when inputting the flightplan, so I am attaching a screenshot.