What was found
FLT 4600 - DURING APPROACH INTO YOW FROM ATL, THE CREW SELECTED THE FLAPS TO TWENTY DEGREES AND AT ELEVEN DEGREES RECEIVED A FLAPS FAIL CAUTION MESSAGE, WITH THE FLAPS REMAINING AT ELEVEN DEGREES. QRH PROCEDURES WERE COMPLIED WITH AND AN EMERGENCY DECLARED. THE FLAPS WERE SELECTED TO EIGHT DEGREES AND THE AIRCRAFT LANDED SAFELY IN YOW. LOCAL MAINTENANCE INSPECTED AND RESET THE FLAPS IAW AD 98-20-01. ASA MAINTENANCE REMOVED AND REPLACED THE FLAPS POWER DRIVE UNIT. OPS CHECKS GOOD. AIRCRAFT OK FOR SERVICE. (M)