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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