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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 

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238 

14 CFR Ch. I (1–1–24 Edition) 

§ 121.641 

for 30 minutes at normal cruising fuel 
consumption for day VFR operations. 

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

§ 121.641 Fuel supply: Nonturbine and 

turbo-propeller-powered airplanes: 

Flag operations. 

(a) No person may dispatch or take 

off 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 dispatched; 

(2) Thereafter, to fly to and land at 

the most distant alternate airport 
specified in the dispatch release; and 

(3) Thereafter, to fly for 30 minutes 

plus 15 percent of the total time re-
quired to fly at normal cruising fuel 
consumption to the airports specified 
in paragraphs (a) (1) and (2) of this sec-
tion or to fly for 90 minutes at normal 
cruising fuel consumption, whichever 
is less. 

(b) No person may dispatch a nontur-

bine or turbo-propeller-powered air-
plane to an airport for which an alter-
nate is not specified under 
§ 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 nor-
mal cruising fuel consumption. 

§ 121.643 Fuel supply: Nonturbine and 

turbo-propeller-powered airplanes: 

Supplemental operations. 

(a) Except as provided in paragraph 

(b) of this section, no person may re-
lease for flight or takeoff a nonturbine 
or turbo-propeller-powered airplane un-
less, 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 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 
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 speci-
fied in paragraphs (a) (1) and (2) of this 
section, or to fly for 90 minutes at nor-
mal cruising fuel consumption, which-
ever is less. 

(c) No person may release a nontur-

bine or turbo-propeller-powered air-
plane to an airport for which an alter-
nate is not specified under § 121.623(b), 
unless it has enough fuel, considering 
wind and other weather conditions ex-
pected, to fly to that airport and there-
after to fly for three hours at normal 
cruising fuel consumption. 

[Doc. No. 6258, 29 FR 19222, Dec. 31, 1964, as 
amended by Amdt. 121–10, 30 FR 10025, Aug. 
12, 1965; Amdt. 121–251, 60 FR 65935, Dec. 20, 
1995] 

§ 121.645 Fuel supply: Turbine-engine 

powered airplanes, other than 
turbo propeller: Flag and supple-
mental operations. 

(a) Any flag operation within the 48 

contiguous United States and the Dis-
trict of Columbia may use the fuel re-
quirements of § 121.639. 

(b) For any certificate holder con-

ducting flag or supplemental oper-
ations outside the 48 contiguous United 
States and the District of Columbia, 
unless authorized by the Administrator 
in the operations specifications, no per-
son may release for flight or takeoff a 
turbine-engine powered airplane (other 
than a turbo-propeller powered air-
plane) unless, considering 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) After that, to fly for a period of 10 

percent of the total time required to 
fly from the airport of departure to, 
and land at, the airport to which it was 
released;