As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON FINAL APPROACH, AIRCRAFT HAD A SUDDEN SHARP MOVEMENT WHEN FLAPS WERE SELECTED. AN AIRSPEED DIFFERENCE OF 10 TO 20 KNOTS BECAME APPARENT. THIS CONTINUED DOWN TO ROLL-OUT. CAPTAIN'S AIRSPEED SHOWED 70, 1ST OFFICER ZERO. NR 2 AIR DATA AND INERTIAL REFERENCE UNIT INOPERATIVE. AIR DATA MODULE REPLACED AND SYSTEM CHECKED SERVICEABLE.