237
Federal Aviation Administration, DOT
§ 121.639
needed to fly to that airport (at the ap-
proved one-engine inoperative cruise
speed under standard conditions in still
air) would exceed the approved time for
the airplane’s most limiting ETOPS
Significant System (including the air-
plane’s most limiting fire suppression
system time for those cargo and bag-
gage compartments required by regula-
tion to have fire-suppression systems)
minus 15 minutes.
(b) For ETOPS beyond 180 minutes,
no person may list an airport as an
ETOPS Alternate Airport in a dispatch
or flight release if the time needed to
fly to that airport:
(1) at the all engine operating cruise
speed, corrected for wind and tempera-
ture, exceeds the airplane’s most lim-
iting fire suppression system time
minus 15 minutes for those cargo and
baggage compartments required by reg-
ulation to have fire suppression sys-
tems (except as provided in paragraph
(c) of this section), or
(2) at the one-engine-inoperative
cruise speed, corrected for wind and
temperature, exceeds the airplane’s
most limiting ETOPS Significant Sys-
tem time (other than the airplane’s
most limiting fire suppression system
time minus 15 minutes for those cargo
and baggage compartments required by
regulation to have fire-suppression sys-
tems).
(c) For turbine-engine powered air-
planes with more than two engines, the
certificate holder need not meet para-
graph (b)(1) of this section until Feb-
ruary 15, 2013.
[Doc. No. FAA–2002–6717, 72 FR 1882, Jan. 16,
2007]
§ 121.635 Dispatch to and from refuel-
ing or provisional airports: Domes-
tic and flag operations.
No person may dispatch an airplane
to or from a refueling or provisional
airport except in accordance with the
requirements of this part applicable to
dispatch from regular airports and un-
less that airport meets the require-
ments of this part applicable to regular
airports.
[Doc. No. 16383, 43 FR 22649, May 25, 1978]
§ 121.637 Takeoffs from unlisted and
alternate airports: Domestic and
flag operations.
(a) No pilot may takeoff an airplane
from an airport that is not listed in the
operations specifications unless—
(1) The airport and related facilities
are adequate for the operation of the
airplane;
(2) He can comply with the applicable
airplane operating limitations;
(3) The airplane has been dispatched
according to dispatching rules applica-
ble to operation from an approved air-
port; and
(4) The weather conditions at that
airport are equal to or better than the
following:
(i)
Airports in the United States.
The
weather minimums for takeoff pre-
scribed in part 97 of this chapter; or
where minimums are not prescribed for
the airport, 800–2, 900–1
1
⁄
2
, or 1,000–1.
(ii)
Airports outside the United States.
The weather minimums for takeoff pre-
scribed 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, 900–1
1
⁄
2
, or 1,000–1.
(b) No pilot may take off from an al-
ternate airport unless the weather con-
ditions are at least equal to the mini-
mums prescribed in the certificate
holder’s operations specifications for
alternate airports.
[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]
§ 121.639 Fuel supply: All domestic op-
erations.
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 au-
thorized to conduct day VFR oper-
ations in their operations specifica-
tions and who are operating non-
transport category airplanes type cer-
tificated after December 31, 1964, to fly