The rules.
(c) An operator shall ensure that the pre-flight
calculation of usable fuel required for a flight
includes:
(1) Taxy fuel;
(2) Trip fuel;
(3) Reserve fuel consisting of:
(i) Contingency fuel (see IEM OPS
1.255(c)(3)(i));
(ii) Alternate fuel, if a destination
alternate is required. (This does not
preclude selection of the departure
aerodrome as the destination alternate);
(iii) Final reserve fuel; and
(iv) Additional fuel, if required by
the type of operation (e.g. ETOPS); and
(4) Extra fuel if required by the
commander.
JAR–OPS 1.375 In-flight fuel management
(See Appendix 1 to JAR–OPS
1.375)
(a) An operator shall establish a procedure to
ensure that in-flight fuel checks and fuel
management are carried out.
(b) A commander shall ensure that the amount
of usable fuel remaining in flight is not less than the
fuel required to proceed to an aerodrome where a
safe landing can be made, with final reserve fuel
remaining.
(c) The commander shall declare an emergency
when the actual usable fuel on board is less than
final reserve fuel.
Appendix 1 to JAR–OPS 1.375
In-flight fuel management
(b) In-flight fuel management.
[(1)] If, as a result of an in-flight fuel
check, the expected fuel remaining on arrival at
the destination is less than the required alternate
fuel plus final reserve fuel, the commander must
take into account the traffic and the operational
conditions prevailing at the destination
aerodrome, along the diversion route to an
alternate aerodrome and at the destination
alternate aerodrome, when deciding [whether] to
proceed to the destination aerodrome or to divert,
so as to land with not less than final reserve fuel.
[(2) On a flight to an isolated aerodrome:
The last possible point of diversion to any
available en-route alternate aerodrome shall be
determined. Before reaching this point, the
commander shall assess the fuel expected to
remain overhead the isolated aerodrome, the
weather conditions, and the traffic and operational
conditions prevailing at the isolated aerodrome
and at any of the en-route aerodromes before
deciding whether to proceed to the isolated
aerodrome or to divert to an en-route aerodrome.
(See AMC to Appendix 1 to JAR-OPS
1.375(b)(2))]
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