What was found
PILOT REPORTED FLAPS WOULD NOT RETRACT AFTER LANDING. TROUBLESHOT SYS IAW THE MM 27-50-00-101 AND HBC TECH SUPPORT RECOMMENDATIONS. RECEIVED NUMEROUS FAULT CODES NOT FOUND IN TROUBLESHOOTING MATRIX. REPLACED FLAP CONTROL UNIT WITH REPAIRED FLAP CONTROL UNIT IAW THE MM 27-50-08-401. FLAP CONTROL SYS OPS NORMAL. RECOMMEND AIRFRAME AND FLAP CONTROL UNIT MFG INVESTIGATE RAC/HBC 390 FLEET FLAP CONTROL UNIT SYS FAILURES FOR EXCESSIVE FAILURE RATE AND INVESTIGATE FURTHER IF WARRANTED.