Section 121.633

14 CFR Ch. I (1-1-19 Edition)

in conditions that have occurred since
dispatch.
(d) If paragraph (c)(1) of this section
cannot be met for a specific airport,
the dispatch or flight release may be
amended to add an ETOPS Alternate
Airport within the maximum ETOPS
diversion time that could be authorized
for that flight with weather conditions
at or above operating minima.
(e) Before the ETOPS Entry Point,
the pilot in command for a supplemental operator or a dispatcher for a
flag operator must use company communications to update the flight plan
if needed because of a re-evaluation of
aircraft system capabilities.
(f) No person may change an original
destination or alternate airport that is
specified in the original dispatch or
flight release to another airport while
the aircraft is en route unless the other
airport is authorized for that type of
aircraft and the appropriate requirements of SectionSection 121.593 through 121.661 and
121.173 are met at the time of redispatch or amendment of the flight release.
(g) Each person who amends a dispatch or flight release en route shall
record that amendment.
[Doc. No. 628, 29 FR 19222, Dec. 31, 1964, as
amended by Amdt. 121-65, 35 FR 12709, Aug.
11, 1970; Amdt. 121-329, 72 FR 1881, Jan. 16,
2007]

Section 121.633 Considering time-limited systems in planning ETOPS alternates.
(a) For ETOPS up to and including
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 (at the approved 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 airplane-s most limiting fire suppression
system time for those cargo and baggage compartments required by regulation 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 temperature, exceeds 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 systems (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 System 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 systems).
(c) For turbine-engine powered airplanes with more than two engines, the
certificate holder need not meet paragraph (b)(1) of this section until February 15, 2013.
[Doc. No. FAA-2002-6717, 72 FR 1882, Jan. 16,
2007]

Section 121.635 Dispatch to and from refueling or provisional airports: Domestic 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 unless that airport meets the requirements of this part applicable to regular
airports.
[Doc. No. 16383, 43 FR 22649, May 25, 1978]

Section 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 applicable to operation from an approved airport; and
(4) The weather conditions at that
airport are equal to or better than the
following:

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