What was found
LOSS OF RT INERTIAL REFERENCE SYS & YAW DAMPER. EMER DECLARED FLIGHT RETURNED & LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. REPLACED AIR DATA INERTIAL REFERENCE UNIT. SYS GND CHECKED NORMAL, OPERATION CLOSED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
LOSS OF RT INERTIAL REFERENCE SYS & YAW DAMPER. EMER DECLARED FLIGHT RETURNED & LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. REPLACED AIR DATA INERTIAL REFERENCE UNIT. SYS GND CHECKED NORMAL, OPERATION CLOSED.