As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACY - FLT 181 - AUTO-PILOT CONTROL IS UNRELIABLE IN CLIMB, DESCENT, OR ALT HOLD MODES. WILL NOT HOLE ASSIGNED VERT SPEED AND STARTED A SUDDEN DESCENT WHEN IN ALT HOLD. DMI'D PER MEL 22-16-1-6. DMI NR 00460. PLACARD INSTALLED CAT 'C'. (M)