Federal Aviation Administration, DOT

Section 125.205

(i) Except as provided in paragraph
(d) of this section, two approved independent navigation systems suitable
for navigating the airplane along the
route within the degree of accuracy required for ATC;
(ii) One marker beacon receiver providing visual and aural signals;
(iii) One ILS receiver;
(iv) Two transmitters;
(v) Two microphones;
(vi) Two headsets or one headset and
one speaker; and
(vii) Two independent communication systems, one of which must have
two-way voice communication capability, capable of transmitting to, and
receiving from, at least one appropriate facility from any place on the
route to be flown; and
(3) Any RNAV system used to meet
the navigation equipment requirements of this section is authorized in
the certificate holder-s operations
specifications.
(d) Use of a single independent navigation system for operations under IFR - not
for extended overwater operations. Notwithstanding the requirements of paragraph (c)(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.
(e) Use of VOR navigation equipment.
If VOR navigation equipment is required by paragraph (c) or (d) of this
section, no person may operate an airplane unless it is equipped with at least
one approved DME or a suitable RNAV
system.
(f) Extended over-water operations.
Notwithstanding the requirements of

paragraph (c) of this section, installation and use of a single long-range
navigation system and a single longrange communication system for extended over-water operations in certain
geographic areas may be authorized by
the Administrator and approved in the
certificate holder-s operations specifications. The following are among the
operational factors the Administrator
may consider in granting an authorization:
(1) The ability of the flight crew to
navigate the airplane along the route
to be flown within the degree of accuracy required for ATC;
(2) The length of the route being
flown; and
(3) The duration of the very high frequency communications gap.
[Doc. No. FAA-2002-14002, 72 FR 31682, June 7,
2007]

Section 125.204 Portable electronic devices.
(a) Except as provided in paragraph
(b) of this section, no person may operate, nor may any operator or pilot in
command of an aircraft allow the operation of, any portable electronic device
on any U.S.-registered civil aircraft operating under this part.
(b) Paragraph (a) of this section does
not apply to - 
(1) Portable voice recorders;
(2) Hearing aids;
(3) Heart pacemakers;
(4) Electric shavers;
(5) Portable oxygen concentrators
that comply with the requirements in
Section 125.219; or
(6) Any other portable electronic device that the Part 125 certificate holder
has determined will not cause interference with the navigation or communication system of the aircraft on
which it is to be used.
(c) The determination required by
paragraph (b)(6) of this section shall be
made by that Part 125 certificate holder operating the particular device to be
used.
[Doc. No. FAA-1998-4954, 64 FR 1080, Jan. 7,
1999, as amended by Docket FAA-2014-0554,
Amdt. 125-65, 81 FR 33118, May 24, 2016]

Section 125.205 Equipment
requirements:
Airplanes under IFR.
No person may operate an airplane
under IFR unless it has - 

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