Adam Air Flight 574
First Officer Susanto switches his IRS mode to ATT (or attitude) mode, and his attitude indicator screen goes blank. Because of this, Captain Widodo is required to fly the aircraft straight and level for 30 seconds. Because the pilots were focused on the navigation error, neither of them noticed that the autopilot had disconnected. The Boeing 737 slowly began to bank to the right, because an earlier unresolved maintenance error had put the ailerons slightly out of trim.