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341 

Federal Aviation Administration, DOT 

§ 125.204 

(b) 

Navigation equipment for operations 

over the top. 

No person may operate an 

airplane over the top unless it has 
navigation equipment suitable for the 
route to be flown. 

(c) 

Communication and navigation 

equipment for IFR or extended over-water 
operations—General. 

Except as provided 

in paragraph (f) of this section, no per-
son may operate an airplane carrying 
passengers under IFR or in extended 
over-water operations unless— 

(1) The en route navigation aids nec-

essary for navigating the airplane 
along the route (e.g., ATS routes, ar-
rival and departure routes, and instru-
ment approach procedures, including 
missed approach procedures if a missed 
approach routing is specified in the 
procedure) are available and suitable 
for use by the aircraft navigation sys-
tems required by this section; 

(2) The airplane used in those oper-

ations is equipped with at least the fol-
lowing equipment— 

(i) Except as provided in paragraph 

(d) of this section, two approved inde-
pendent navigation systems suitable 
for navigating the airplane along the 
route within the degree of accuracy re-
quired for ATC; 

(ii) One marker beacon receiver pro-

viding 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 communica-

tion systems, one of which must have 
two-way voice communication capa-
bility, capable of transmitting to, and 
receiving from, at least one appro-
priate facility from any place on the 
route to be flown; and 

(3) Any RNAV system used to meet 

the navigation equipment require-
ments of this section is authorized in 
the certificate holder’s operations 
specifications. 

(d) 

Use of a single independent naviga-

tion system for operations under IFR—not 
for extended overwater operations. 

Not-

withstanding the requirements of para-
graph (c)(2)(i) of this section, the air-
plane may be equipped with a single 
independent navigation system suit-
able 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 suit-
able, in the event of loss of the naviga-
tion capability of the single inde-
pendent navigation system permitted 
by this paragraph at any point along 
the route, for proceeding safely to a 
suitable airport and completing an in-
strument approach; and 

(2) The airplane has sufficient fuel so 

that the flight may proceed safely to a 
suitable airport by use of the remain-
ing navigation system, and complete 
an instrument approach and land. 

(e) 

Use of VOR navigation equipment. 

If VOR navigation equipment is re-
quired by paragraph (c) or (d) of this 
section, no person may operate an air-
plane 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, installa-
tion and use of a single long-range 
navigation system and a single long- 
range communication system for ex-
tended over-water operations in certain 
geographic areas may be authorized by 
the Administrator and approved in the 
certificate holder’s operations speci-
fications. The following are among the 
operational factors the Administrator 
may consider in granting an authoriza-
tion: 

(1) The ability of the flight crew to 

navigate the airplane along the route 
to be flown within the degree of accu-
racy required for ATC; 

(2) The length of the route being 

flown; and 

(3) The duration of the very high fre-

quency communications gap. 

[Doc. No. FAA–2002–14002, 72 FR 31682, June 7, 
2007] 

§ 125.204 Portable electronic devices. 

(a) Except as provided in paragraph 

(b) of this section, no person may oper-
ate, nor may any operator or pilot in 
command of an aircraft allow the oper-
ation of, any portable electronic device 
on any U.S.-registered civil aircraft op-
erating under this part. 

(b) Paragraph (a) of this section does 

not apply to— 

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342 

14 CFR Ch. I (1–1–24 Edition) 

§ 125.205 

(1) Portable voice recorders; 
(2) Hearing aids; 
(3) Heart pacemakers; 
(4) Electric shavers; 
(5) Portable oxygen concentrators 

that comply with the requirements in 
§ 125.219; or 

(6) Any other portable electronic de-

vice that the Part 125 certificate holder 
has determined will not cause inter-
ference with the navigation or commu-
nication 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 hold-
er 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] 

§ 125.205 Equipment requirements: 

Airplanes under IFR. 

No person may operate an airplane 

under IFR unless it has— 

(a) A vertical speed indicator; 
(b) A free-air temperature indicator; 
(c) A heated pitot tube for each air-

speed indicator; 

(d) A power failure warning device or 

vacuum indicator to show the power 
available for gyroscopic instruments 
from each power source; 

(e) An alternate source of static pres-

sure for the altimeter and the airspeed 
and vertical speed indicators; 

(f) At least two generators each of 

which is on a separate engine, or which 
any combination of one-half of the 
total number are rated sufficiently to 
supply the electrical loads of all re-
quired instruments and equipment nec-
essary for safe emergency operation of 
the airplane; and 

(g) Two independent sources of en-

ergy (with means of selecting either), 
of which at least one is an engine-driv-
en pump or generator, each of which is 
able to drive all gyroscopic instru-
ments and installed so that failure of 
one instrument or source does not 
interfere with the energy supply to the 
remaining instruments or the other en-
ergy source. For the purposes of this 
paragraph, each engine-driven source 
of energy must be on a different en-
gine. 

(h) For the purposes of paragraph (f) 

of this section, a continuous inflight 
electrical load includes one that draws 
current continuously during flight, 
such as radio equipment, electrically 
driven instruments, and lights, but 
does not include occasional intermit-
tent loads. 

(i) An airspeed indicating system 

with heated pitot tube or equivalent 
means for preventing malfunctioning 
due to icing. 

(j) A sensitive altimeter. 
(k) Instrument lights providing 

enough light to make each required in-
strument, switch, or similar instru-
ment easily readable and installed so 
that the direct rays are shielded from 
the flight crewmembers’ eyes and that 
no objectionable reflections are visible 
to them. There must be a means of con-
trolling the intensity of illumination 
unless it is shown that nondimming in-
strument lights are satisfactory. 

§ 125.206 Pitot heat indication systems. 

(a) Except as provided in paragraph 

(b) of this section, after April 12, 1981, 
no person may operate a transport cat-
egory airplane equipped with a flight 
instrument pitot heating system unless 
the airplane is equipped with an oper-
able pitot heat indication system that 
complies with § 25.1326 of this chapter 
in effect on April 12, 1978. 

(b) A certificate holder may obtain 

an extension of the April 12, 1981, com-
pliance date specified in paragraph (a) 
of this section, but not beyond April 12, 
1983, from the Executive Director, 
Flight Standards Service if the certifi-
cate holder— 

(1) Shows that due to circumstances 

beyond its control it cannot comply by 
the specified compliance date; and 

(2) Submits by the specified compli-

ance date a schedule for compliance ac-
ceptable to the Executive Director, in-
dicating that compliance will be 
achieved at the earliest practicable 
date. 

[Doc. No. 18904, 46 FR 43806, Aug. 31, 1981, as 
amended by Amdt. 125–13, 54 FR 39294, Sept. 
25, 1989; Docket FAA–2018–0119, Amdt. 125–68, 
83 FR 9174, Mar. 5, 2018]