The operator shall ensure that the calculation of usable fuel required by such helicopter for a flight meets the requirements specified in Document SA-CATS-128 and includes-
(a) taxi/hover fuel;
(b) trip fuel;
(c) reserve fuel consisting of-
(i) contingency fuel;
(ii) alternate fuel, if a destination alternate aerodrome is required;
(iii) final reserve fuel;
(iv) additional fuel, if required by the type of operation; and
(d) extra fuel, if required by the pilot-in-command.