What was found
NR 2 ADI PITCH/ROLL MISMATCH, AHRS DATA INVALID, YAW DAMPNER FAILED ON BOTH CHANNELS. FLAPS VERY SLOW MOVING AND STUCK AT 10 PERCENT. FLAPS WOULD NOT RETRACT ABOVE 5 DEGREE. DECLARED EMERGENCY AND RETURNED TO AIRPORT. LANDED WITHOUT INCIDENT. CORRECTIVE ACTION: 1) PERFORMED GMT TEST FOR BOTH NR 1 AND NR 2 AHS SYSTEM. TESTED GOOD - 2) PERFORMED GMT TEST FOR YAW DAMPNER SYS.(BOTH L & R CHANNELS). TESTED GOOD. 3) BLED NR 1 MAIN HYDRAULIC SYSTEM AND FPU. (B) FUNCTIONAL TEST OF WING FLAP SYSTEM GOOD. NO DEFECTS NOTED. NOTE: FLAPS SLOW TO MOVE, REMOVED AND REPLACED THE FLAP POWER DRIVE UNIT. ((TRACKING NUMBER KPVA 2002-9))