Originally Posted by albatross
I seem to recall there is a minimum number of night fright hours required not just a night rating.
accordance with Section 421.11;
(b) 50 hours night flight time as pilot-in-command or as co-pilot of which a minimum of 15 hours shall have been acquired in helicopters;
Depends... this applies only for an unrestricted ATPL(H). If you don't have the night hours or rating, and/or meet instrument requirements then it's possible to hold a Restricted ATPL(H) in Canada for aerial work only.