THE PILOT'S POOR JUDGEMENT/DECISION-MAKING, AND HIS OVER CONFIDENCE IN HIS OWN ABILITY WHICH LED TO HIS REPEATED DECISIONS TO OPERATE HIS AIRCRAFT IN ADVERSE WEATHER CONDITIONS. THE FACT THAT THE PILOT HAD OPERATED THE AIRCRAFT IN ADVERSE WEATHER CONDITIONS WITHOUT INCIDENT ON NUMEROUS PREVIOUS OCCASIONS CONTRIBUTED TO HIS OVER CONFIDENCE/ EXPECTANCY ON THE DAY OF THE ACCIDENT.