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14 CFR Ch. I (1–1–24 Edition) 

§ 121.101 

the requirements of paragraph (d) of 
this section as of February 15, 2007. 

[Doc. No. 28154, 62 FR 13256, Mar. 19, 1997, as 
amended by Amdt. 121–329, 72 FR 1878, Jan. 
16, 2007; Amdt. 121–333, 72 FR 31680, June 7, 
2007; Docket FAA–2018–0119, Amdt. 121–380, 83 
FR 9173, Mar. 5, 2018] 

§ 121.101 Weather reporting facilities. 

(a) Each certificate holder con-

ducting domestic or flag operations 
must show that enough weather report-
ing services are available along each 
route to ensure weather reports and 
forecasts necessary for the operation. 

(b) Except as provided in paragraph 

(d) of this section, no certificate holder 
conducting domestic or flag operations 
may use any weather report to control 
flight unless— 

(1) For operations within the 48 con-

tiguous States and the District of Co-
lumbia, it was prepared by the U.S. Na-
tional Weather Service or a source ap-
proved by the U.S. National Weather 
Service; or 

(2) For operations conducted outside 

the 48 contiguous States and the Dis-
trict of Columbia, it was prepared by a 
source approved by the Administrator. 

(c) Each certificate holder con-

ducting domestic or flag operations 
that uses forecasts to control flight 
movements shall use forecasts prepared 
from weather reports specified in para-
graph (b) of this section and from any 
source approved under its system 
adopted pursuant to paragraph (d) of 
this section. 

(d) Each certificate holder con-

ducting domestic or flag operations 
shall adopt and put into use an ap-
proved system for obtaining forecasts 
and reports of adverse weather phe-
nomena, such as clear air turbulence, 
thunderstorms, and low altitude wind 
shear, that may affect safety of flight 
on each route to be flown and at each 
airport to be used. 

[Doc. No. 6258, 29 FR 19194, Dec. 31, 1964, as 
amended by Amdt. 121–27, 36 FR 13911, July 
28, 1971; Amdt. 121–134, 42 FR 27573, May 31, 
1977; Amdt. 121–253, 61 FR 2610, Jan. 26, 1996] 

§ 121.103 En route navigation facili-

ties. 

(a) Except as provided in paragraph 

(b) of this section, each certificate 
holder conducting domestic or flag op-

erations must show, for each proposed 
route (including to any regular, provi-
sional, refueling or alternate airports), 
that suitable navigation aids are avail-
able to navigate the airplane along the 
route within the degree of accuracy re-
quired for ATC. Navigation aids re-
quired for approval of routes outside of 
controlled airspace are listed in the 
certificate holder’s operations speci-
fications except for those aids required 
for routes to alternate airports. 

(b) Navigation aids are not required 

for any of the following operations— 

(1) Day VFR operations that the cer-

tificate holder shows can be conducted 
safely by pilotage because of the char-
acteristics of the terrain; 

(2) Night VFR operations on routes 

that the certificate holder shows have 
reliably lighted landmarks adequate 
for safe operation; and 

(3) Other operations approved by the 

responsible Flight Standards office. 

[Doc. No. FAA–2002–14002, 72 FR 31681, June 7, 
2007, as amended by Docket FAA–2018–0119, 
Amdt. 121–380, 83 FR 9173, Mar. 5, 2018] 

§ 121.105 Servicing and maintenance 

facilities. 

Each certificate holder conducting 

domestic or flag operations must show 
that competent personnel and adequate 
facilities and equipment (including 
spare parts, supplies, and materials) 
are available at such points along the 
certificate holder’s route as are nec-
essary for the proper servicing, mainte-
nance, and preventive maintenance of 
airplanes and auxiliary equipment. 

[Doc. No. 28154, 61 FR 2610, Jan. 26, 1996] 

§ 121.106 ETOPS Alternate Airport: 

Rescue and fire fighting service. 

(a) Except as provided in paragraph 

(b) of this section, the following rescue 
and fire fighting service (RFFS) must 
be available at each airport listed as an 
ETOPS Alternate Airport in a dispatch 
or flight release. 

(1) For ETOPS up to 180 minutes, 

each designated ETOPS Alternate Air-
port must have RFFS equivalent to 
that specified by ICAO as Category 4, 
or higher. 

(2) For ETOPS beyond 180 minutes, 

each designated ETOPS Alternate Air-
port must have RFFS equivalent to 
that specified by ICAO Category 4, or