Section 121.351

14 CFR Ch. I (1-1-19 Edition)

approach routing is specified in the
procedure) are available and suitable
for use by the aircraft navigation systems required by this section;
(2) The airplane used in those operations is equipped with at least - 
(i) Except as provided in paragraph
(c) of this section, two approved independent navigation systems suitable
for navigating the airplane along the
route to be flown within the degree of
accuracy required for ATC;
(ii) One marker beacon receiver providing visual and aural signals; and
(iii) One ILS receiver; and
(3) Any RNAV system used to meet
the navigation equipment requirements of this section is authorized in
the certificate holder-s operations
specifications.
(b) Communication equipment requirements. No person may operate an airplane under VFR over routes that cannot be navigated by pilotage, and no
person may operate an airplane under
IFR or over the top, unless the airplane
is equipped with - 
(1) At least two independent communication systems necessary under normal operating conditions to fulfill the
functions specified in Section 121.347 (a); and
(2) At least one of the communication systems required by paragraph
(b)(1) of this section must have twoway voice communication capability.
(c) Use of a single independent navigation system for operations under VFR over
routes that cannot be navigated by pilotage, or operations conducted under IFR
or over the top. Notwithstanding the requirements of paragraph (a)(2)(i) of this
section, the airplane may be equipped
with a single independent navigation
system suitable for navigating the airplane along the route to be flown within the degree of accuracy required for
ATC if:
(1) It can be shown that the airplane
is equipped with at least one other
independent navigation system suitable, in the event of loss of the navigation capability of the single independent navigation system permitted
by this paragraph at any point along
the route, for proceeding safely to a
suitable airport and completing an instrument approach; and
(2) The airplane has sufficient fuel so
that the flight may proceed safely to a

suitable airport by use of the remaining navigation system, and complete
an instrument approach and land.
(d) Use of VOR navigation equipment.
If VOR navigation equipment is used to
comply with paragraph (a) or (c) of this
section, no person may operate an airplane unless it is equipped with at least
one approved DME or suitable RNAV
system.
(e) Additional communication system
equipment requirements for operators subject to Section 121.2. In addition to the requirements in paragraph (b) of this section,
no person may operate an airplane having a passenger seat configuration of 10
to 30 seats, excluding each crewmember
seat, and a maximum payload capacity
of 7,500 pounds or less, under IFR, over
the top, or in extended over-water operations unless it is equipped with at
least - 
(1) Two microphones; and
(2) Two headsets, or one headset and
one speaker.
[Doc. No. FAA-2002-14002, 72 FR 31681, June 7,
2007]

Section 121.351 Communication and navigation equipment for extended overwater operations and for certain
other operations.
(a) Except as provided in paragraph
(c) of this section, no person may conduct an extended over-water operation
unless the airplane is equipped with at
least two independent long-range navigation systems and at least two independent long-range communication
systems necessary under normal operating conditions to fulfill the following
functions - 
(1) Communicate with at least one
appropriate station from any point on
the route;
(2) Receive meteorological information from any point on the route by either of two independent communication systems. One of the communication systems used to comply with this
paragraph may be used to comply with
paragraphs (a)(1) and (a)(3) of this section; and
(3) At least one of the communication systems must have two-way voice
communication capability.
(b) No certificate holder conducting a
flag or supplemental operation or a domestic operation within the State of

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