872 

49 CFR Ch. I (10–1–23 Edition) 

§ 175.702 

Associate Administrator determines 
that it is designed to assure that: 

(1) The packages can be placed in 

each predesignated area in accordance 
with the minimum separation dis-
tances prescribed in paragraph (a) of 
this section; and 

(2) The predesignated areas are sepa-

rated from each other by minimum dis-
tance equal to at least four times the 
distances required by paragraphs (a) 
and (b) of this section for the 
predesignated area containing pack-
ages with the largest sum of transport 
indexes. 

§ 175.702

Separation distance require-

ments for packages containing 
Class 7 (radioactive) materials in 
cargo aircraft. 

(a) No person may carry in a cargo 

aircraft any package required by 

§ 172.403 of this subchapter to be labeled 
Radioactive Yellow–II or Radioactive 
Yellow–III unless: 

(1) The total transport index for all 

packages does not exceed 50.0 and the 
packages are carried in accordance 
with § 175.701(a); or 

(2) The total transport index for all 

packages exceeds 50.0; and 

(i) The separation distance between 

the surfaces of the radioactive mate-
rials packages, overpacks or freight 
containers and any space occupied by 
live animals is at least 0.5 m (20 inches) 
for journeys not exceeding 24 hours and 
at least 1.0 m (39 inches) for journeys 
longer than 24 hours; and 

(ii) The minimum separation dis-

tances between the radioactive mate-
rial and any areas occupied by persons 
that are specified in the following table 
are maintained: 

Transport index or sum of transport indexes of all packages in the aircraft or 

predesignated area 

Minimum separation distances 

Centimeters 

Inches 

50.1 to 60.0 ...........................................................................................................................

465 

183 

60.1 to 70.0 ...........................................................................................................................

505 

199 

70.1 to 80.0 ...........................................................................................................................

545 

215 

80.1 to 90.0 ...........................................................................................................................

580 

228 

90.1 to 100.0 .........................................................................................................................

610 

240 

100.1 to 110.0 .......................................................................................................................

645 

254 

110.1 to 120.0 .......................................................................................................................

670 

264 

120.1 to 130.0 .......................................................................................................................

700 

276 

130.1 to 140.0 .......................................................................................................................

730 

287 

140.1 to 150.0 .......................................................................................................................

755 

297 

150.1 to 160.0 .......................................................................................................................

780 

307 

160.1 to 170.0 .......................................................................................................................

805 

317 

170.1 to 180.0 .......................................................................................................................

830 

327 

180.1 to 190.0 .......................................................................................................................

855 

337 

190.1 to 200.0 .......................................................................................................................

875 

344 

(b) In addition to the limits on com-

bined criticality safety indexes stated 
in § 175.700(b), 

(1) The criticality safety index of any 

single group of packages must not ex-
ceed 50.0 (as used in this section, the 
term ‘‘group of packages’’ means pack-
ages that are separated from each 
other in an aircraft by a distance of 6 
m (20 feet) or less); and 

(2) Each group of packages must be 

separated from every other group in 
the aircraft by not less than 6 m (20 
feet), measured from the outer surface 
of each group. 

[71 FR 14604, Mar. 22, 2006, as amended at 71 
FR 54396, Sept. 14, 2006; 77 FR 60943, Oct. 5, 
2012; 79 FR 40618, July 11, 2014] 

§ 175.703

Other special requirements 

for the acceptance and carriage of 
packages containing Class 7 mate-
rials. 

(a) No person may accept for carriage 

in an aircraft packages of Class 7 mate-
rials, other than limited quantities, 
contained in a rigid or non-rigid over-
pack, including a fiberboard box or 
plastic bag, unless they have been pre-
pared for shipment in accordance with 
§ 172.403(h) of this subchapter. 

(b) Each shipment of fissile material 

packages must conform to the require-
ments of §§ 173.457 and 173.459 of this 
subchapter. 

(c) No person shall offer or accept for 

transportation, or transport, by air— 

873 

Pipeline and Haz. Matls. Safety Admin., DOT 

§ 175.706 

(1) Vented Type B(M) packages, pack-

ages which require external cooling by 
an ancillary cooling system or pack-
ages subject to operational controls 
during transport; or 

(2) Liquid pyrophoric Class 7 (radio-

active) materials. 

(d) Packages with radiation levels at 

the package surface or a transport 
index in excess of the limits specified 
in § 173.441(a) of this subchapter may 
not be transported by aircraft except 
under special arrangements approved 
by the Associate Administrator. 

§ 175.704

Plutonium shipments. 

Shipments of plutonium which are 

subject to 10 CFR 71.88(a)(4) must com-
ply with the following: 

(a) Each package containing pluto-

nium must be secured and restrained to 
prevent shifting under normal condi-
tions. 

(b) A package of plutonium having a 

gross mass less than 40 kg (88 pounds) 
and both its height and diameter less 
than 50 cm (19.7 inches)— 

(1) May not be transported aboard an 

aircraft carrying other cargo required 
to bear a Division 1.1 label; and 

(2) Must be stowed aboard the air-

craft on the main deck or the lower 
cargo compartment in the aft-most lo-
cation that is possible for cargo of its 
size and weight, and no other cargo 
may be stowed aft of packages con-
taining plutonium. 

(c) A package of plutonium exceeding 

the size and weight limitations in para-
graph (b) of this section— 

(1) May not be transported aboard an 

aircraft carrying other cargo required 
to bear any of the following labels: 
Class 1 (all Divisions), Class 2 (all Divi-
sions), Class 3, Class 4 (all Divisions), 
Class 5 (all Divisions), or Class 8; and 

(2) Must be securely cradled and tied 

down to the main deck of the aircraft 
in a manner that restrains the package 
against the following internal forces 
acting separately relative to the deck 
of the aircraft; Upward, 2g; Forward, 
9g; Sideward, 1.5g; Downward, 4.5g. 

§ 175.705

Radioactive contamination. 

(a) A carrier shall take care to avoid 

possible inhalation, ingestion, or con-
tact by any person with Class 7 (radio-

active) materials that may have been 
released from their packagings. 

(b) When contamination is present or 

suspected, the package containing a 
Class 7 material, any loose Class 7 ma-
terial, associated packaging material, 
and any other materials that have been 
contaminated must be segregated as 
far as practicable from personnel con-
tact until radiological advice or assist-
ance is obtained from the U.S. Depart-
ment of Energy or appropriate State or 
local radiological authorities. 

(c) An aircraft in which Class 7 (ra-

dioactive) material has been released 
must be taken out of service and may 
not be returned to service or routinely 
occupied until the aircraft is checked 
for radioactive substances and it is de-
termined that any radioactive sub-
stances present do not meet the defini-
tion of radioactive material, as defined 
in § 173.403 of this subchapter, and it is 
determined in accordance with § 173.443 
of this subchapter that the dose rate at 
every accessible surface must not ex-
ceed 0.005 mSv per hour (0.5 mrem per 
hour) and there is no significant re-
movable surface contamination. 

(d) Each aircraft used routinely for 

transporting Class 7 materials shall be 
periodically checked for radioactive 
contamination, and an aircraft must be 
taken out of service if contamination 
exceeds the level specified in paragraph 
(c). The frequency of these checks shall 
be related to the likelihood of contami-
nation and the extent to which Class 7 
materials are transported. 

(e) In addition to the reporting re-

quirements of (§§ 171.15 and 171.16 of 
this subchapter and § 175.31 of this part, 
an aircraft operator shall notify the of-
feror at the earliest practicable mo-
ment following any incident in which 
there has been breakage, spillage, or 
suspected radioactive contamination 
involving Class 7 (radioactive) mate-
rials shipments. 

[71 FR 14604, Mar. 22, 2006, as amended at 79 
FR 40618, July 11, 2014; 80 FR 1164, Jan. 8, 
2015] 

§ 175.706

Separation distances for un-

developed film from packages con-
taining Class 7 (radioactive) mate-
rials. 

No person may carry in an aircraft 

any package of Class 7 (radioactive)