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208 

14 CFR Ch. I (1–1–24 Edition) 

§ 121.507 

§ 121.507 Flight time limitations: Three 

pilot crews: airplanes. 

(a) No certificate holder conducting 

supplemental operations may schedule 
a pilot— 

(1) For flight deck duty in an air-

plane that has a crew of three pilots for 
more than eight hours in any 24 con-
secutive hours; or 

(2) To be aloft in an airplane that has 

a crew of three pilot for more than 12 
hours in any 24 consecutive hours. 

(b) No pilot of an airplane that has a 

crew of three pilots may be on duty for 
more than 18 hours in any 24 consecu-
tive hours. 

[Doc. No. 6258, 29 FR 19218, Dec. 31, 1964; 30 
FR 3639, Mar. 19, 1965, as amended by Amdt. 
121–253, 61 FR 2613, Jan. 26, 1996] 

§ 121.509 Flight time limitations: Four 

pilot crews: airplanes. 

(a) No certificate holder conducting 

supplemental operations may schedule 
a pilot— 

(1) For flight deck duty in an air-

plane that has a crew of four pilots for 
more than eight hours in any 24 con-
secutive hours; or 

(2) To be aloft in an airplane that has 

a crew of four pilots for more than 16 
hours in any 24 consecutive hours. 

(b) No pilot of an airplane that has a 

crew of four pilots may be on duty for 
more than 20 hours in any 24 consecu-
tive hours. 

[Doc. No. 6258, 29 FR 19218, Dec. 31, 1964; 30 
FR 3639, Mar. 19, 1965, as amended by Amdt. 
121–253, 61 FR 2613, Jan. 26, 1996] 

§ 121.511 Flight time limitations: 

Flight engineers: airplanes. 

(a) In any operation in which one 

flight engineer is serving the flight 
time limitations in §§ 121.503 and 121.505 
apply to that flight engineer. 

(b) In any operation in which more 

than one flight engineer is serving and 
the flight crew contains more than two 
pilots the flight time limitations in 
§ 121.509 apply in place of those in 
§ 121.505. 

§ 121.513 Flight time limitations: Over-

seas and international operations: 

airplanes. 

In place of the flight time limita-

tions in §§ 121.503 through 121.511, a cer-
tificate holder conducting supple-

mental operations may elect to comply 
with the flight time limitations of 
§§ 121.515 and 121.521 through 121.525 for 
operations conducted— 

(a) Between a place in the 48 contig-

uous States and the District of Colum-
bia, or Alaska, and any place outside 
thereof; 

(b) Between any two places outside 

the 48 contiguous States, the District 
of Columbia, and Alaska; or 

(c) Between two places within the 

State of Alaska or the State of Hawaii. 

[Doc. No. 6258, 29 FR 19218, Dec. 31, 1964; 30 
FR 3639, Mar. 19, 1965, as amended by Amdt. 
121–253, 61 FR 2613, Jan. 26, 1996] 

§ 121.515 Flight time limitations: All 

airmen: airplanes. 

No airman may be aloft as a flight 

crewmember more than 1,000 hours in 
any 12-calendar-month period. 

§ 121.517 Flight time limitations: Other 

commercial flying: airplanes. 

No airman who is employed by a cer-

tificate holder conducting supple-
mental operations may do any other 
commercial flying, if that commercial 
flying plus his flying in operations 
under this part will exceed any flight 
time limitation in this part. 

[Doc. No. 28154, 61 FR 2613, Jan. 26, 1996] 

§ 121.519 Flight time limitations: 

Deadhead transportation: airplanes. 

Time spent by an airman in deadhead 

transportation to or from a duty as-
signment is not considered to be part 
of any rest period. 

§ 121.521 Flight time limitations: Crew 

of two pilots and one additional air-

man as required. 

(a) No certificate holder conducting 

supplemental operations may schedule 
an airman to be aloft as a member of 
the flight crew in an airplane that has 
a crew of two pilots and at least one 
additional flight crewmember for more 
than 12 hours during any 24 consecutive 
hours. 

(b) If an airman has been aloft as a 

member of a flight crew for 20 or more 
hours during any 48 consecutive hours 
or 24 or more hours during any 72 con-
secutive hours, he must be given at 
least 18 hours of rest before being as-
signed to any duty with the certificate 

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209 

Federal Aviation Administration, DOT 

§ 121.525 

holder. In any case, he must be relieved 
of all duty for at least 24 consecutive 
hours during any seven consecutive 
days. 

(c) No airman may be aloft as a flight 

crewmember more than— 

(1) 120 hours during any 30 consecu-

tive days; or 

(2) 300 hours during any 90 consecu-

tive days. 

[Doc. No. 6258, 29 FR 19218, Dec. 31, 1964, as 
amended by Amdt. 121–17, 31 FR 1147, Jan. 28, 
1966; Amdt. 121–253, 61 FR 2613, Jan. 26, 1996] 

§ 121.523 Flight time limitations: Crew 

of three or more pilots and addi-

tional airmen as required. 

(a) No certificate holder conducting 

supplemental operations may schedule 
an airman for flight deck duty as a 
flight engineer, or navigator in a crew 
of three or more pilots and additional 
airmen for a total of more than 12 
hours during any 24 consecutive hours. 

(b) Each certificate holder con-

ducting supplemental operations shall 
schedule its flight hours to provide 
adequate rest periods on the ground for 
each airman who is away from his prin-
cipal operations base. It shall also pro-
vide adequate sleeping quarters on the 
airplane whenever an airman is sched-
uled to be aloft as a flight crewmember 
for more than 12 hours during any 24 
consecutive hours. 

(c) No certificate holder conducting 

supplemental operations may schedule 
any flight crewmember to be on contin-
uous duty for more than 30 hours. Such 
a crewmember is considered to be on 
continuous duty from the time he re-
ports for duty until the time he is re-
leased from duty for a rest period of at 
least 10 hours on the ground. If a flight 
crewmember is on continuous duty for 
more than 24 hours (whether scheduled 
or not) during any scheduled duty pe-
riod, he must be given at least 16 hours 
for rest on the ground after completing 
the last flight scheduled for that sched-
uled duty period before being assigned 
any further flight duty. 

(d) If a flight crewmember is required 

to engage in deadhead transportation 
for more than four hours before begin-
ning flight duty, one half of the time 
spent in deadhead transportation must 
be treated as duty time for the purpose 
of complying with duty time limita-

tions, unless he is given at least 10 
hours of rest on the ground before 
being assigned to flight duty. 

(e) Each certificate holder con-

ducting supplemental operations shall 
give each airman, upon return to his 
operations base from any flight or se-
ries of flights, a rest period that is at 
least twice the total number of hours 
he was aloft as a flight crewmember 
since the last rest period at his base, 
before assigning him to any further 
duty. If the required rest period is 
more than seven days, that part of the 
rest period that is more than seven 
days may be given at any time before 
the pilot is again scheduled for flight 
duty. 

(f) No airman may be aloft as a flight 

crewmember for more than 350 hours in 
any 90 consecutive days. 

[Doc. No. 6258, 29 FR 19218, Dec. 31, 1964; 30 
FR 3639, Mar. 19, 1965, as amended by Amdt. 
121–253, 61 FR 2613, Jan. 26, 1996; Amdt. 121– 
387, 87 FR 75846, Dec. 9, 2022] 

§ 121.525 Flight time limitations: Pilots 

serving in more than one kind of 

flight crew. 

(a) This section applies to each pilot 

assigned during any 30 consecutive 
days to more than one type of flight 
crew. 

(b) The flight time limitations for a 

pilot who is scheduled for duty aloft for 
more than 20 hours in two-pilot crews 
in 30 consecutive days, or whose assign-
ment in such a crew is interrupted 
more than once in any 30 consecutive 
days by assignment to a crew of two or 
more pilots and an additional flight 
crewmember, are those listed in 
§§ 121.503 through 121.509, as appro-
priate. 

(c) Except for a pilot covered by para-

graph (b) of this section, the flight 
time limitations for a pilot scheduled 
for duty aloft for more than 20 hours in 
two-pilot and additional flight crew-
member crews in 30 consecutive days or 
whose assignment in such a crew is in-
terrupted more than once in any 30 
consecutive days by assignment to a 
crew consisting of three pilots and an 
additional flight crewmember, are 
those set forth in § 121.521. 

(d) The flight time limitations for a 

pilot to whom paragraphs (b) and (c) of 
this section do not apply, and who is