Section 121.101

14 CFR Ch. I (1-1-19 Edition)
erations must show, for each proposed
route (including to any regular, provisional, refueling or alternate airports),
that suitable navigation aids are available to navigate the airplane along the
route within the degree of accuracy required for ATC. Navigation aids required for approval of routes outside of
controlled airspace are listed in the
certificate holder-s operations specifications 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 certificate holder shows can be conducted
safely by pilotage because of the characteristics 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.

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]

Section 121.101 Weather reporting facilities.
(a) Each certificate holder conducting domestic or flag operations
must show that enough weather reporting 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 contiguous States and the District of Columbia, it was prepared by the U.S. National Weather Service or a source approved by the U.S. National Weather
Service; or
(2) For operations conducted outside
the 48 contiguous States and the District of Columbia, it was prepared by a
source approved by the Administrator.
(c) Each certificate holder conducting domestic or flag operations
that uses forecasts to control flight
movements shall use forecasts prepared
from weather reports specified in paragraph (b) of this section and from any
source approved under its system
adopted pursuant to paragraph (d) of
this section.
(d) Each certificate holder conducting domestic or flag operations
shall adopt and put into use an approved system for obtaining forecasts
and reports of adverse weather phenomena, 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. 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]

Section 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 necessary for the proper servicing, maintenance, and preventive maintenance of
airplanes and auxiliary equipment.
[Doc. No. 28154, 61 FR 2610, Jan. 26, 1996]

Section 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 Airport must have RFFS equivalent to
that specified by ICAO as Category 4,
or higher.
(2) For ETOPS beyond 180 minutes,
each designated ETOPS Alternate Airport must have RFFS equivalent to
that specified by ICAO Category 4, or

[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]

Section 121.103 En route navigation facilities.
(a) Except as provided in paragraph
(b) of this section, each certificate
holder conducting domestic or flag op-

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