What was found
AUTO PRESSURIZATION WAS UNCONTROLLABLE. INITIATED EMERGENCY DESCENT AND AIR TURNEDBACK TO BIL. PERFORMED ADJUST/TEST OF CABIN PRESSURE CONTROL IAW DC9 MM 21-32-00.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AUTO PRESSURIZATION WAS UNCONTROLLABLE. INITIATED EMERGENCY DESCENT AND AIR TURNEDBACK TO BIL. PERFORMED ADJUST/TEST OF CABIN PRESSURE CONTROL IAW DC9 MM 21-32-00.