As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 4142 - DURING APPROACH CREW REPORTED A DUAL PITCH TRIM FAILURE WITH AUTO PILOT ON AFTER SELECTING FLAPS TO 9 DEGREES. IAS WAS 210 KNOTS IN SMOOTH AIR IN VMC CONDITIONS LEVELING OFF AT 5000 FEET. NO CONTROL COLUMN FORCE WAS FELT DUE TO AUTO PILOT BEING ON. REPLACED HSCU. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. (M)