He was sentenced to 80 hours of community work, fined $3700, and disqualified from flying for three months, the CAA said in a statement.
CAA safety information general manager John Kay said Metcalfe's actions indicated a distinct lack of concern for the safety of the passenger, those in the area, and the aircraft itself.
"The helicopter was low level, over water, with a person hanging from a skid. If there had been an emergency, Mr Metcalfe would have had nowhere to go, and no option but to descend into the lake, potentially on top of that person.
"Although Mr Metcalfe demonstrated poor judgement, his subsequent remorse and early guilty plea is acknowledged."