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Federal Aviation Administration, DOT 

§ 121.99 




Those affecting takeoff and land-

ing performance computations in ac-
cordance with Subpart I of this part. 


Controlling obstacles. 


Instrument flight procedures. 


Departure procedure. 


Approach procedure. 


Missed approach procedure. 


Special information. 


Runway visual range measure-

ment equipment. 


Prevailing winds under low visi-

bility conditions. 

(c) If the responsible Flight Stand-

ards office charged with the overall in-
spection of the certificate holder’s op-
erations finds that revisions are nec-
essary for the continued adequacy of 
the certificate holder’s system for col-
lection, dissemination, and usage of 
aeronautical data that has been grant-
ed approval, the certificate holder 
shall, after notification by the respon-
sible Flight Standards office, make 
those revisions in the system. Within 
30 days after the certificate holder re-
ceives such notice, the certificate hold-
er may file a petition to reconsider the 
notice with the Executive Director, 
Flight Standards Service. This filing of 
a petition to reconsider stays the no-
tice pending a decision by the Execu-
tive Director, Flight Standards Serv-
ice. However, if the responsible Flight 
Standards office finds that there is an 
emergency that requires immediate ac-
tion in the interest of safety in air 
transportation, the Executive Director, 
Flight Standards Service may, upon 
statement of the reasons, require a 
change effective without stay. 

[Doc. No. 6258, 29 FR 19194, Dec. 31, 1964, as 
amended by Amdt. 121–162, 45 FR 46738, July 
10, 1980; Amdt. 121–207, 54 FR 39293, Sept. 25, 
1989; Amdt. 121–253, 61 FR 2610, Jan. 26, 1996; 
Amdt. 121–329, 72 FR 1878, Jan. 16, 2007; Dock-
et FAA–2018–0119, Amdt. 121–380, 83 FR 9172, 
9173, Mar. 5, 2018] 

§ 121.99

Communications facilities— 

domestic and flag operations. 

(a) Each certificate holder con-

ducting domestic or flag operations 
must show that a two-way communica-
tion system, or other means of commu-
nication approved by the responsible 
Flight Standards office, is available 
over the entire route. The communica-
tions may be direct links or via an ap-

proved communication link that will 
provide reliable and rapid communica-
tions under normal operating condi-
tions between each airplane and the ap-
propriate dispatch office, and between 
each airplane and the appropriate air 
traffic control unit. 

(b) Except in an emergency, for all 

flag and domestic kinds of operations, 
the communications systems between 
each airplane and the dispatch office 
must be independent of any system op-
erated by the United States. 

(c) Each certificate holder con-

ducting flag operations must provide 
voice communications for ETOPS 
where voice communication facilities 
are available. In determining whether 
facilities are available, the certificate 
holder must consider potential routes 
and altitudes needed for diversion to 
ETOPS Alternate Airports. Where fa-
cilities are not available or are of such 
poor quality that voice communication 
is not possible, another communication 
system must be substituted. 

(d) Except as provided in paragraph 

(e) of this section, after February 15, 
2008 for ETOPS beyond 180 minutes, 
each certificate holder conducting flag 
operations must have a second commu-
nication system in addition to that re-
quired by paragraph (c) of this section. 
That system must be able to provide 
immediate satellite-based voice com-
munications of landline-telephone fi-
delity. The system must be able to 
communicate between the flight crew 
and air traffic services, and the flight 
crew and the certificate holder. In de-
termining whether such communica-
tions are available, the certificate 
holder must consider potential routes 
and altitudes needed for diversion to 
ETOPS Alternate Airports. Where im-
mediate, satellite-based voice commu-
nications are not available, or are of 
such poor quality that voice commu-
nication is not possible, another com-
munication system must be sub-

(e) Operators of two-engine turbine- 

powered airplanes with 207 minute 
ETOPS approval in the North Pacific 
Area of Operation must comply with 

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