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14 CFR Ch. I (1–1–19 Edition) 

§ 135.91 

oxygen concentrator when the condi-
tions in paragraphs (b) and (f) of this 
section are satisfied. 

(1) The equipment must be— 
(i) Of an approved type or in con-

formity with the manufacturing, pack-
aging, marking, labeling, and mainte-
nance requirements of title 49 CFR 
parts 171, 172, and 173, except 
§ 173.24(a)(1); 

(ii) When owned by the certificate 

holder, maintained under the certifi-
cate 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 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 cyl-

inder must not exceed the rated cyl-
inder pressure. 

(4) The pilot in command must be ad-

vised 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 ac-
cess to or use of any required emer-
gency 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 cre-
ate an open flame within 10 feet of oxy-
gen storage and dispensing equipment 
carried under paragraph (a) of this sec-
tion 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 equip-
ment to connect or disconnect oxygen 
bottles or any other ancillary compo-

nent while any passenger is aboard the 
aircraft. 

(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 
aircraft in a medical emergency when 
no other practical means of transpor-
tation (including any other properly 
equipped certificate holder) is reason-
ably available and the person carried 
under the medical emergency is accom-
panied 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, ex-
cluding Saturdays, Sundays, and Fed-
eral holidays, after the deviation, send 
to the responsible Flight Standards of-
fice a complete report of the operation 
involved, including a description of the 
deviation and the reasons for it. 

(f) 

Portable oxygen concentrators

—(1) 

Acceptance criteria. 

A passenger may 

carry or operate a portable oxygen con-
centrator for personal use on board an 
aircraft and a certificate holder may 
allow a passenger to carry or operate a 
portable oxygen concentrator on board 
an aircraft operated under this part 
during all phases of flight if the port-
able oxygen concentrator satisfies all 
of the requirements of this paragraph 
(f): 

(i) Is legally marketed in the United 

States in accordance with Food and 
Drug Administration requirements in 
title 21 of the CFR; 

(ii) Does not radiate radio frequency 

emissions that interfere with aircraft 
systems; 

(iii) Generates a maximum oxygen 

pressure of less than 200 kPa gauge 
(29.0 psig/43.8 psia) at 20 

°

C (68 

°

F); 

(iv) Does not contain any hazardous 

materials subject to the Hazardous Ma-
terials Regulations (49 CFR parts 171 
through 180) except as provided in 49 
CFR 175.10 for batteries used to power 
portable electronic devices and that do 
not require aircraft operator approval; 
and 

(v) Bears a label on the exterior of 

the device applied in a manner that en-
sures the label will remain affixed for 
the life of the device and containing 

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