Federal Aviation Administration, DOT

Section 125.219

when otherwise considered to be necessary by the pilot in command.
(b) No passenger or crewmember may
smoke while any  - No Smoking -  sign is
lighted nor may any passenger or crewmember smoke in any lavatory.
(c) Each passenger required by
Section 125.211(b) to occupy a seat or berth
shall fasten his or her safety belt about
him or her and keep it fastened while
any  - Fasten Seat Belt -  sign is lighted.
(d) Each passenger shall comply with
instructions given him or her by crewmembers regarding compliance with
paragraphs (b) and (c) of this section.
[Doc. No. 26142, 57 FR 42675, Sept. 15, 1992]

Section 125.219 Oxygen and portable oxygen
concentrators for medical use by
passengers.
(a) Except as provided in paragraphs
(d) and (f) of this section, no certificate
holder may allow the carriage or operation of equipment for the storage,
generation or dispensing of medical oxygen unless the conditions in paragraphs (a) through (c) of this section
are satisfied. Beginning August 22, 2016,
a certificate holder may allow a passenger to carry and operate a portable
oxygen concentrator when the conditions in paragraphs (b) and (f) of this
section are satisfied.
(1) The equipment must be - 
(i) Of an approved type or in conformity with the manufacturing, packaging, marking, labeling, and maintenance requirements of title 49 CFR
parts 171, 172, and 173, except
Section 173.24(a)(1);
(ii) When owned by the certificate
holder, maintained under the certificate holder-s approved maintenance
program;
(iii) Free of flammable contaminants
on all exterior surfaces;
(iv) Constructed so that all valves,
fittings, and gauges are protected from
damage during that carriage or operation; and
(v) Appropriately secured.
(2) When the oxygen is stored in the
form of a liquid, the equipment must
have been under the certificate holder-s
approved maintenance program since
its purchase new or since the storage
container was last purged.

(3) When the oxygen is stored in the
form of a compressed gas as defined in
title 49 CFR 173.115(b) - 
(i) When owned by the certificate
holder, it must be maintained under its
approved maintenance program; and
(ii) The pressure in any oxygen cylinder must not exceed the rated cylinder pressure.
(4) The pilot in command must be advised when the equipment is on board
and when it is intended to be used.
(5) The equipment must be stowed,
and each person using the equipment
must be seated so as not to restrict access to or use of any required emergency or regular exit or of the aisle in
the passenger compartment.
(b) No person may smoke or create
an open flame and no certificate holder
may allow any person to smoke or create an open flame within 10 feet of oxygen storage and dispensing equipment
carried under paragraph (a) of this section or a portable oxygen concentrator
carried and operated under paragraph
(f) of this section.
(c) No certificate holder may allow
any person other than a person trained
in the use of medical oxygen equipment to connect or disconnect oxygen
bottles or any other ancillary component while any passenger is aboard the
airplane.
(d) Paragraph (a)(1)(i) of this section
does not apply when that equipment is
furnished by a professional or medical
emergency service for use on board an
airplane in a medical emergency when
no other practical means of transportation (including any other properly
equipped certificate holder) is reasonably available and the person carried
under the medical emergency is accompanied by a person trained in the use of
medical oxygen.
(e) Each certificate holder who, under
the authority of paragraph (d) of this
section,
deviates
from
paragraph
(a)(1)(i) of this section under a medical
emergency shall, within 10 days, excluding Saturdays, Sundays, and Federal holidays, after the deviation, send
to the responsible Flight Standards office charged with the overall inspection of the certificate holder a complete report of the operation involved,

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