(1) A flight crew member holds a valid line check for the operator of an aeroplane and the aeroplane if:
(a) the flight crew member has successfully completed the operator's line check for an aeroplane of that kind; and
(i) for a pilot--subregulation 121.590(1); and
(ii) for a flight engineer--subregulation 121.590(2); and
(c) the check is valid in accordance with subregulations (2) and (3) of this regulation.
(2) Subject to subregulation (3), a line check is valid for the period:
(a) beginning on the day the check is completed; and
(b) ending at the end of the 12 month period beginning at the end of the month in which the check is completed.
(a) a person's line check (the existing check ) for the operator of an aeroplane and an aeroplane is valid in accordance with subregulation (2); and
(b) the person successfully completes another line check (the new check ) for that operator and aeroplane in accordance with paragraphs (1)(a) and (b) less than 3 months before the day the existing check is due to expire;
the new check is valid for the period of 12 months beginning at the end of the
day the existing check expires.