Federal Aviation Administration, DOT

Section 121.99
proved communication link that will
provide reliable and rapid communications under normal operating conditions between each airplane and the appropriate 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 operated by the United States.
(c) Each certificate holder conducting 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 facilities 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 communication system in addition to that required by paragraph (c) of this section.
That system must be able to provide
immediate satellite-based voice communications of landline-telephone fidelity. The system must be able to
communicate between the flight crew
and air traffic services, and the flight
crew and the certificate holder. In determining whether such communications are available, the certificate
holder must consider potential routes
and altitudes needed for diversion to
ETOPS Alternate Airports. Where immediate, satellite-based voice communications are not available, or are of
such poor quality that voice communication is not possible, another communication system must be substituted.
(e) Operators of two-engine turbinepowered airplanes with 207 minute
ETOPS approval in the North Pacific
Area of Operation must comply with

(4) Obstacles.
(i) Those affecting takeoff and landing performance computations in accordance with Subpart I of this part.
(ii) Controlling obstacles.
(5) Instrument flight procedures.
(i) Departure procedure.
(ii) Approach procedure.
(iii) Missed approach procedure.
(6) Special information.
(i) Runway visual range measurement equipment.
(ii) Prevailing winds under low visibility conditions.
(c) If the responsible Flight Standards office charged with the overall inspection of the certificate holder-s operations finds that revisions are necessary for the continued adequacy of
the certificate holder-s system for collection, dissemination, and usage of
aeronautical data that has been granted approval, the certificate holder
shall, after notification by the responsible Flight Standards office, make
those revisions in the system. Within
30 days after the certificate holder receives such notice, the certificate holder may file a petition to reconsider the
notice with the Executive Director,
Flight Standards Service. This filing of
a petition to reconsider stays the notice pending a decision by the Executive Director, Flight Standards Service. However, if the responsible Flight
Standards office finds that there is an
emergency that requires immediate action 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; Docket FAA-2018-0119, Amdt. 121-380, 83 FR 9172,
9173, Mar. 5, 2018]

Section 121.99 Communications
facilities - 
domestic and flag operations.
(a) Each certificate holder conducting domestic or flag operations
must show that a two-way communication system, or other means of communication approved by the responsible
Flight Standards office, is available
over the entire route. The communications may be direct links or via an ap-

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