What was found
INVESTIGATED REPORTED FLAP SYS FAILED TO OPERATE. FOUND THE FLAP CONTROL UNIT TO HAVE AN INTERNAL FAILURE, WOULD NOT RESET. REPLACED THE FLAP CONTROL UNIT WITH A SERVICEABLE FLAP CONTROL UNIT AND SYS OPERATIONS FOUND NORMAL. RECOMMEND AIRFRAME AND COMPONENT MFG TRACK FAILURE INTERVALS FOR VARIOUS P/N FCU'S USED AND DETERMINE A MODIFICATION LEVEL STANDARD FOR THE GREATEST RELIABILITY. RECOMMEND ISSUING A RECOMMENDED TYPE SB TO REPLACE FCU'S WITH MORE RELIABLE CONFIGURATION UNITS.