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14 CFR Ch. I (1–1–19 Edition) 

§ 121.597 

§ 121.597

Flight release authority: Sup-

plemental operations. 

(a) No person may start a flight 

under a flight following system with-
out specific authority from the person 
authorized by the operator to exercise 
operational control over the flight. 

(b) No person may start a flight un-

less the pilot in command or the person 
authorized by the operator to exercise 
operational control over the flight has 
executed a flight release setting forth 
the conditions under which the flights 
will be conducted. The pilot in com-
mand may sign the flight release only 
when he and the person authorized by 
the operator to exercise operational 
control believe that the flight can be 
made with safety. 

(c) No person may continue a flight 

from an intermediate airport without a 
new flight release if the aircraft has 
been on the ground more than six 
hours. 

[Doc. No. 6258, 29 FR 19222, Dec. 31, 1964, as 
amended by Amdt. 121–3, 30 FR 3639, Mar. 19, 
1965] 

§ 121.599

Familiarity with weather 

conditions. 

(a) 

Domestic and flag operations. 

No 

aircraft dispatcher may release a flight 
unless he is thoroughly familiar with 
reported and forecast weather condi-
tions on the route to be flown. 

(b) 

Supplemental operations. 

No pilot 

in command may begin a flight unless 
he is thoroughly familiar with reported 
and forecast weather conditions on the 
route to be flown. 

[Doc. No. 6258, 29 FR 19222, Dec. 31, 1964, as 
amended by Amdt. 121–253, 61 FR 2614, Jan. 
26, 1996] 

§ 121.601

Aircraft dispatcher informa-

tion to pilot in command: Domestic 
and flag operations. 

(a) The aircraft dispatcher shall pro-

vide the pilot in command all available 
current reports or information on air-
port conditions and irregularities of 
navigation facilities that may affect 
the safety of the flight. 

(b) Before beginning a flight, the air-

craft dispatcher shall provide the pilot 
in command with all available weather 
reports and forecasts of weather phe-
nomena that may affect the safety of 
flight, including adverse weather phe-

nomena, such as clear air turbulence, 
thunderstorms, and low altitude wind 
shear, for each route to be flown and 
each airport to be used. 

(c) During a flight, the aircraft dis-

patcher shall provide the pilot in com-
mand any additional available infor-
mation of meteorological conditions 
(including adverse weather phenomena, 
such as clear air turbulence, thunder-
storms, and low altitude wind shear), 
and irregularities of facilities and serv-
ices that may affect the safety of the 
flight. 

[Doc. No. 6258, 29 FR 19222, Dec. 31, 1964, as 
amended by Amdt. 121–134, 42 FR 27573, May 
31, 1977; Amdt. 121–144, 43 FR 22649, May 25, 
1978; Amdt. 121–253, 61 FR 2614, Jan. 26, 1996] 

§ 121.603

Facilities and services: Sup-

plemental operations. 

(a) Before beginning a flight, each 

pilot in command shall obtain all 
available current reports or informa-
tion on airport conditions and irreg-
ularities of navigation facilities that 
may affect the safety of the flight. 

(b) During a flight, the pilot in com-

mand shall obtain any additional avail-
able information of meteorological 
conditions and irregularities of facili-
ties and services that may affect the 
safety of the flight. 

§ 121.605

Airplane equipment. 

No person may dispatch or release an 

airplane unless it is airworthy and is 
equipped as prescribed in § 121.303. 

§ 121.607

Communication and naviga-

tion facilities: Domestic and flag op-
erations. 

(a) Except as provided in paragraph 

(b) of this section for a certificate hold-
er conducting flag operations, no per-
son may dispatch an airplane over an 
approved route or route segment unless 
the communication and navigation fa-
cilities required by §§ 121.99 and 121.103 
for the approval of that route or seg-
ment are in satisfactory operating con-
dition. 

(b) If, because of technical reasons or 

other reasons beyond the control of a 
certificate holder conducting flag oper-
ations, the facilities required by 
§§ 121.99 and 121.103 are not available 
over a route or route segment outside 

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