Federal Aviation Administration, DOT

Section 121.643

(i) Airports in the United States. The
weather minimums for takeoff prescribed in part 97 of this chapter; or
where minimums are not prescribed for
the airport, 800-2, 900-11-2, or 1,000-1.
(ii) Airports outside the United States.
The weather minimums for takeoff prescribed or approved by the government
of the country in which the airport is
located; or where minimums are not
prescribed or approved for the airport,
800-2, 900-11-2, or 1,000-1.
(b) No pilot may take off from an alternate airport unless the weather conditions are at least equal to the minimums prescribed in the certificate
holder-s operations specifications for
alternate airports.

(3) Thereafter, to fly for 30 minutes
plus 15 percent of the total time required to fly at normal cruising fuel
consumption to the airports specified
in paragraphs (a) (1) and (2) of this section or to fly for 90 minutes at normal
cruising fuel consumption, whichever
is less.
(b) No person may dispatch a nonturbine or turbo-propeller-powered airplane to an airport for which an alternate
is
not
specified
under
Section 121.621(a)(2), unless it has enough fuel,
considering wind and forecast weather
conditions, to fly to that airport and
thereafter to fly for three hours at normal cruising fuel consumption.

[Doc. No. 6258, 29 FR 19222, Dec. 31, 1964, as
amended by Amdt. 121-33, 32 FR 13912, Oct. 6,
1967; Amdt. 121-253, 61 FR 2615, Jan. 26, 1996]

Section 121.643 Fuel supply: Nonturbine and
turbo-propeller-powered airplanes:
Supplemental operations.

Section 121.639 Fuel supply: All domestic operations.
No person may dispatch or take off
an airplane unless it has enough fuel - 
(a) To fly to the airport to which it is
dispatched;
(b) Thereafter, to fly to and land at
the most distant alternate airport
(where required) for the airport to
which dispatched; and
(c) Thereafter, to fly for 45 minutes
at normal cruising fuel consumption
or, for certificate holders who are authorized to conduct day VFR operations in their operations specifications and who are operating nontransport category airplanes type certificated after December 31, 1964, to fly
for 30 minutes at normal cruising fuel
consumption for day VFR operations.

(a) Except as provided in paragraph
(b) of this section, no person may release for flight or takeoff a nonturbine
or turbo-propeller-powered airplane unless, considering the wind and other
weather conditions expected, it has
enough fuel - 
(1) To fly to and land at the airport
to which it is released;
(2) Thereafter, to fly to and land at
the most distant alternate airport
specified in the flight release; and
(3) Thereafter, to fly for 45 minutes
at normal cruising fuel consumption
or, for certificate holders who are authorized to conduct day VFR operations in their operations specifications and who are operating nontransport category airplanes type certificated after December 31, 1964, to fly
for 30 minutes at normal cruising fuel
consumption for day VFR operations.
(b) If the airplane is released for any
flight other than from one point in the
contiguous United States to another
point in the contiguous United States,
it must carry enough fuel to meet the
requirements of paragraphs (a) (1) and
(2) of this section and thereafter fly for
30 minutes plus 15 percent of the total
time required to fly at normal cruising
fuel consumption to the airports specified in paragraphs (a) (1) and (2) of this
section, or to fly for 90 minutes at normal cruising fuel consumption, whichever is less.

[Doc. No. 6258, 29 FR 19222, Dec. 31, 1964, as
amended by Amdt. 121-251, 60 FR 65935, Dec.
20, 1995]

Section 121.641 Fuel supply: Nonturbine and
turbo-propeller-powered airplanes:
Flag operations.
(a) No person may dispatch or take
off a nonturbine or turbo-propellerpowered airplane unless, considering
the wind and other weather conditions
expected, it has enough fuel - 
(1) To fly to and land at the airport
to which it is dispatched;
(2) Thereafter, to fly to and land at
the most distant alternate airport
specified in the dispatch release; and

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