background image

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. 

background image

865

 

Pipeline and Haz. Matls. Safety Admin., DOT

 

§

175.78

 

T

ABLE TO

P

ARAGRAPH

(b): S

EGREGATION

T

ABLE

 

Hazard label 

Class or division 

2.1 

2.2, 2.3 

4.1 

4.2 

4.3 

5.1 

5.2 

see (b)(2) 

1 ........................

Note 1 ........

Note 2 ........

Note 2 ........

Note 2 ............

Note 2 ........

Note 2 ........

Note 2 ........

Note 2 ............

Note 2 ........

Note 2 ........

Note 2 

2.1 .....................

Note 2 ........

....................

....................

........................

....................

....................

....................

........................

....................

....................

2.2, 2.3 ..............

Note 2 ........

....................

....................

........................

....................

....................

....................

........................

....................

....................

3 ........................

Note 2 ........

....................

....................

........................

....................

....................

....................

X (Note 3) ......

....................

....................

4.1 .....................

Note 2 ........

....................

....................

........................

....................

....................

....................

........................

....................

....................

4.2 .....................

Note 2 ........

....................

....................

........................

....................

....................

....................

X ....................

....................

....................

4.3 .....................

Note 2 ........

....................

....................

........................

....................

....................

....................

........................

....................

X ................

5.1 .....................

Note 2 ........

....................

....................

X (Note 3) ......

....................

X ................

....................

........................

....................

....................

5.2 .....................

Note 2 ........

....................

....................

........................

....................

....................

....................

........................

....................

....................

8 ........................

Note 2 ........

....................

....................

........................

....................

....................

X ................

........................

....................

....................

9 see (b)(2) .......

Note 2 ........

X ................

....................

X ....................

X ................

....................

....................

X ....................

....................

....................

background image

866 

49 CFR Ch. I (10–1–23 Edition) 

§ 175.88 

(c) Instructions for using the Seg-

regation Table are as follows: 

(1) Hazard labels, classes or divisions 

not shown in the table are not subject 
to segregation requirements. 

(2) Dots at the intersection of a row 

and column indicate that no restric-
tions apply. 

(3) The letter ‘‘X’’ at the intersection 

of a row and column indicates that 
packages containing these classes of 
hazardous materials may not be stowed 
next to or in contact with each other, 
or in a position which would allow 
interaction in the event of leakage of 
the contents. 

(4) Note 1. ‘‘Note 1’’ at the intersec-

tion of a row and column means the 
following: 

(i) Only Division 1.4, Compatibility 

Group S, explosives are permitted to be 
transported aboard a passenger air-
craft. Only certain Division 1.3, Com-
patibility Groups C and G, and Division 
1.4, Compatibility Groups B, C, D, E, G 
and S, explosives may be transported 
aboard a cargo aircraft. 

(ii) Division 1.4 explosives in Compat-

ibility Group S may be stowed with Di-
vision 1.3 and 1.4 explosives in compat-
ibility groups as permitted aboard air-
craft under paragraph (c)(4)(i) above. 

(iii) Except for Division 1.4B explo-

sives and as otherwise provided in this 
Note, explosives of different compat-
ibility groups may be stowed together 
whether or not they belong to the same 
division. Division 1.4B explosives must 
not be stowed together with any other 
explosive permitted aboard aircraft ex-
cept Division 1.4S, unless segregated as 
prescribed in paragraph (c)(4)(iv) of 
this section (‘‘Note 1’’). 

(iv) Division 1.4B and Division 1.3 ex-

plosives may not be stowed together. 
Division 1.4B explosives must be loaded 
into separate unit load devices and, 
when stowed aboard the aircraft, the 
unit load devices must be separated by 
other cargo with a minimum separa-
tion of 2 m (6.5 feet). When not loaded 
in unit load devices, Division 1.4B and 
Division 1.3 explosives must be loaded 
into different, non-adjacent loading po-
sitions and separated by other cargo 
with a minimum separation of 2 m (6.5 
feet). 

(5) Note 2. ‘‘Note 2’’ at the intersec-

tion of a row and column means that 

other than explosives of Division 1.4, 
Compatibility Group S, explosives may 
not be stowed together with that class. 

(6) Packages containing hazardous 

materials with multiple hazards in the 
class or divisions, which require seg-
regation in accordance with the Seg-
regation Table, need not be segregated 
from other packages bearing the same 
UN number. 

(7) A package labeled ‘‘BLASTING 

AGENT’’ may not be stowed next to or 
in a position that will allow contact 
with a package of special fireworks or 
railway torpedoes. 

(8) Note 3. ‘‘Note 3’’ at the intersec-

tion of a row and column means that 
UN 3528, Engines, internal combustion, 
flammable liquid powered; Engines, 
fuel cell, flammable liquid powered; 
Machinery internal combustion, flam-
mable liquid powered; and Machinery, 
fuel cell, flammable liquid powered 
need not be segregated from packages 
containing dangerous goods in Division 
5.1. 

[71 FR 14604, Mar. 22, 2006, as amended at 71 
FR 54396, Sept. 14, 2006; 71 FR 78634, Dec. 29, 
2006; 76 FR 3384, Jan. 19, 2011; 85 FR 27899, 
May 11, 2020] 

§ 175.88

Inspection, orientation and se-

curing packages of hazardous mate-
rials. 

(a) A unit load device may not be 

loaded on an aircraft unless the device 
has been inspected and found to be free 
from any evidence of leakage from, or 
damage to, any package containing 
hazardous materials. 

(b) A package containing hazardous 

materials marked ‘‘THIS SIDE UP’’ or 
‘‘THIS END UP’’, or with arrows to in-
dicate the proper orientation of the 
package, must be stored and loaded 
aboard an aircraft in accordance with 
such markings. A package without ori-
entation markings containing liquid 
hazardous materials must be stored 
and loaded with top closure facing up-
ward. 

(c) Packages containing hazardous 

materials must be: 

(1) Secured in an aircraft in a manner 

that will prevent any shifting or 
change in the orientation of the pack-
ages;