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862 

49 CFR Ch. I (10–1–23 Edition) 

§ 175.34 

aircraft operator must make imme-
diately available to an authorized offi-
cial of a Federal, State, or local gov-
ernment agency (which includes emer-
gency responders), the documents or 
information required to be retained by 
this paragraph (c). 

(5) Specify the personnel to be pro-

vided the information required by para-
graph (a) of this section in their oper-
ations manual and/or other appropriate 
manuals. 

(d) The information required by para-

graph (a) of this section and the ship-
ping paper required by (c)(1) of this sec-
tion may be combined into one docu-
ment. 

[83 FR 52899, Oct. 18, 2018, as amended at 85 
FR 27899, May 11, 2020] 

§ 175.34

Exceptions for cylinders of 

compressed oxygen or other oxi-
dizing gases transported within the 
State of Alaska. 

(a) 

Exceptions. 

When transported in 

the State of Alaska, cylinders of com-
pressed oxygen or other oxidizing gases 
aboard aircraft are excepted from all 
the requirements of §§ 173.302(f)(3) 
through (5) and 173.304(f)(3) through (5) 
of this subchapter subject to the fol-
lowing conditions: 

(1) Transportation of the cylinders by 

a ground-based or water-based mode of 
transportation is unavailable and 
transportation by aircraft is the only 
practical means for transporting the 
cylinders to their destination; 

(2) Each cylinder is fully covered 

with a fire or flame resistant blanket 
that is secured in place; and 

(3) The operator of the aircraft com-

plies with the applicable notification 
procedures under § 175.33. 

(b) 

Aircraft restrictions. 

This exception 

only applies to the following types of 
aircraft: 

(1) Cargo-only aircraft transporting 

the cylinders to a delivery destination 
that receives cargo-only service at 
least once a week. 

(2) Passenger and cargo-only aircraft 

transporting the cylinders to a delivery 
destination that does not receive cargo 
only service once a week. 

[79 FR 15046, Mar. 18, 2014] 

Subpart B—Loading, Unloading 

and Handling 

§ 175.75

Quantity limitations and 

cargo location. 

(a) No person may carry on an air-

craft a hazardous material except as 
permitted by this subchapter. 

(b) 

Hazardous materials stowage. 

(1) 

Except as otherwise provided in this 
subchapter, no person may carry a haz-
ardous material in the cabin of a pas-
senger-carrying aircraft or on the 
flight deck of any aircraft, and the haz-
ardous material must be located in a 
place that is inaccessible to persons 
other than crew members. 

(2) Hazardous materials may be car-

ried in a main deck cargo compartment 
of a passenger aircraft provided that 
the compartment is inaccessible to 
passengers and that it meets all certifi-
cation requirements for: a Class B air-
craft cargo compartment in 14 CFR 
25.857(b); or a Class C aircraft cargo 
compartment in 14 CFR 25.857(c). 

(3) A package bearing a ‘‘KEEP 

AWAY FROM HEAT’’ handling mark-
ing must be protected from direct sun-
shine and stored in a cool and venti-
lated place, away from sources of heat. 

(4) Except as provided in paragraph 

(f) of this section, a package con-
taining a hazardous material accept-
able for cargo-only aircraft must be 
loaded in an accessible manner. 

(c) For each package containing a 

hazardous material acceptable for car-
riage aboard passenger-carrying air-
craft, no more than 25 kg (55 pounds) 
net weight of hazardous material may 
be loaded in an inaccessible manner. In 
addition to the 25 kg limitation, an ad-
ditional 75 kg (165 pounds) net weight 
of Division 2.2 (non-flammable com-
pressed gas) may be loaded in an inac-
cessible manner. The requirements of 
this paragraph (c) do not apply to Class 
9, articles of Identification Numbers 
UN0012, UN0014, or UN0055 also meeting 
the requirements of § 173.63(b) of this 
subchapter, articles of Identification 
Numbers UN3528 or UN3529, and Lim-
ited or Excepted Quantity material. 

(d) For the purposes of this section— 
(1) 

Accessible 

means, on passenger- 

carrying or cargo-only aircraft that 
each package is loaded where a crew 
member or other authorized person can 

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863 

Pipeline and Haz. Matls. Safety Admin., DOT 

§ 175.75 

access, handle, and, when size and 
weight permit, separate such packages 
from other cargo during flight, includ-
ing a freight container in an accessible 
cargo compartment when packages are 
loaded in an accessible manner. Addi-
tionally, a package is considered acces-
sible when transported on a cargo-only 
aircraft if it is: 

(i) In a cargo compartment certified 

by FAA as a Class C aircraft cargo 
compartment as defined in 14 CFR 
25.857(c); or 

(ii) In an FAA-certified freight con-

tainer that has an approved fire or 
smoke detection system and fire sup-
pression system equivalent to that re-
quired by the certification require-
ments for a Class C aircraft cargo com-
partment. 

(2) 

Inaccessible 

means all other con-

figurations to include packages loaded 
where a crew member or other author-
ized person cannot access, handle, and, 
when size and weight permit, separate 
such packages from other cargo during 
flight, including a freight container in 
an accessible cargo compartment when 
packages are loaded in an inaccessible 
manner. 

(e) For transport aboard cargo-only 

aircraft, the requirements of para-
graphs (c) and (d) of this section do not 
apply to the following hazardous mate-
rials: 

(1) Class 3, PG III (unless the sub-

stance is also labeled CORROSIVE), 
Class 6.1 (unless the substance is also 
labeled for any hazard class or division 
except FLAMMABLE LIQUID), Divi-
sion 6.2, Class 7 (unless the hazardous 
material meets the definition of an-

other hazard class), Class 9, articles of 
Identification Numbers UN0012, 
UN0014, or UN0055 also meeting the re-
quirements of § 173.63(b) of this sub-
chapter, articles of Identification Num-
bers UN3528 or UN3529, and those 
marked as a Limited Quantity or Ex-
cepted Quantity material. 

(2) Packages of hazardous materials 

transported aboard a cargo aircraft, 
when other means of transportation 
are impracticable or not available, in 
accordance with procedures approved 
in writing by the FAA Regional Office 
in the region where the operator is cer-
tificated. 

(3) Packages of hazardous materials 

carried on small, single pilot, cargo 
aircraft if: 

(i) No person is carried on the air-

craft other than the pilot, an FAA 
Flight Standards inspector, the shipper 
or consignee of the material, a rep-
resentative of the shipper or consignee 
so designated in writing, or a person 
necessary for handling the material; 

(ii) The pilot is provided with written 

instructions on the characteristics and 
proper handling of the materials; and 

(iii) Whenever a change of pilots oc-

curs while the material is on board, the 
new pilot is briefed under a hand-to- 
hand signature service provided by the 
operator of the aircraft. 

(f) At a minimum, quantity limits 

and loading instructions in the fol-
lowing quantity and loading table must 
be followed to maintain acceptable 
quantity and loading between packages 
containing hazardous materials. The 
quantity and loading table is as fol-
lows: 

Q

UANTITY AND

L

OADING

T

ABLE

 

Applicability 

Forbidden 

Quantity Limitation: 25 kg 

net weight of hazardous 

material plus 75 kg net 

weight of Division 2.2 

(non-flammable com-

pressed gas) per cargo 

compartment 

No limit 

Passenger-carrying aircraft 

Cargo Aircraft Only la-

beled packages.

Inaccessible ......................

Accessible. 

Cargo-only aircraft— ..........
Packages authorized 

aboard a passenger-car-
rying aircraft.

Not applicable ...................

Inaccessible (Note 1) ........

Accessible (Note 2). 

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864 

49 CFR Ch. I (10–1–23 Edition) 

§ 175.78 

Q

UANTITY AND

L

OADING

T

ABLE

—Continued 

Applicability 

Forbidden 

Quantity Limitation: 25 kg 

net weight of hazardous 

material plus 75 kg net 

weight of Division 2.2 

(non-flammable com-

pressed gas) per cargo 

compartment 

No limit 

Cargo-only aircraft— ..........
Packages not authorized 

aboard a passenger-car-
rying aircraft and dis-
playing a Cargo Aircraft 
Only label.

Inaccessible (Note 1) ........

Not applicable ...................

Accessible (Note 2). 

Note 1 to § 175.75(f): 
The following materials are not subject to this loading restriction— 
a. Class 3, PG III (unless the substance is also labeled CORROSIVE). 
b. Division 6.1 (unless the substance is also labeled for any hazard class or division except FLAMMABLE LIQUID). 
c. Division 6.2. 
d. Class 7 (unless the hazardous material meets the definition of another hazard class). 
e. Class 9, Limited Quantity, or Excepted Quantity material. 
f. Articles of Identification Numbers UN0012, UN0014, or UN0055 also meeting the requirements of § 173.63(b). 
g. Articles of Identification Numbers UN3528 or UN3529. 
Note 2 to § 175.75(f): 
Aboard cargo-only aircraft, packages required to be loaded in a position that is considered to be accessible include those load-

ed in a Class C cargo compartment. 

[76 FR 82178, Dec. 30, 2011, as amended at 78 FR 65486, Oct. 31, 2013; 81 FR 35544, June 2, 2016; 
82 FR 15892, Mar. 30, 2017; 85 FR 83402, Dec. 21, 2020; 87 FR 44998, July 26, 2022] 

§ 175.78

Stowage compatibility of 

cargo. 

(a) For stowage on an aircraft, in a 

cargo facility, or in any other area at 
an airport designated for the stowage 
of hazardous materials, packages con-
taining hazardous materials which 
might react dangerously with one an-
other may not be placed next to each 
other or in a position that would allow 
a dangerous interaction in the event of 
leakage. 

(b)(1) At a minimum, the segregation 

instructions prescribed in the following 
Segregation Table must be followed to 
maintain acceptable segregation be-
tween packages containing hazardous 
materials with different hazards. The 
Segregation Table instructions apply 
whether or not the class or division is 
the primary or subsidiary risk. 

(2) Packages and overpacks con-

taining articles of Identification Num-
bers UN3090 and UN3480 prepared in ac-
cordance with § 173.185(b)(3) and 
(c)(4)(vi) must not be stowed on an air-
craft next to, in contact with, or in a 
position that would allow interaction 
with packages or overpacks containing 
hazardous materials that bear a Class 1 
(other than Division 1.4S), Division 2.1, 
Class 3, Division 4.1, or Division 5.1 
hazard label. To maintain acceptable 
segregation between packages and 
overpacks, the segregation require-
ments shown in the Segregation Table 
must be followed. The segregation re-
quirements apply based on all hazard 
labels applied to the package or over-
pack, irrespective of whether the haz-
ard is the primary or subsidiary haz-
ard.