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193 

Federal Aviation Administration, DOT 

§ 121.517 

Administrator as adequate to serve the 
terminal points concerned. 

[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] 

§ 121.505

Flight time limitations: Two 

pilot crews: airplanes. 

(a) If a certificate holder conducting 

supplemental operations schedules a 
pilot to fly more than eight hours dur-
ing any 24 consecutive hours, it shall 
give him an intervening rest period at 
or before the end of eight scheduled 
hours of flight duty. This rest period 
must be at least twice the number of 
hours flown since the preceding rest pe-
riod, but not less than eight hours. The 
certificate holder conducting supple-
mental operations shall relieve that 
pilot of all duty with it during that 
rest period. 

(b) No pilot of an airplane that has a 

crew of two pilots may be on duty for 
more than 16 hours during any 24 con-
secutive 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] 

§ 121.507

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 

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