Pipeline and Haz. Matls. Safety Admin., DOT
far as practicable from personnel contact until radiological advice or assistance is obtained from the U.S. Department of Energy or appropriate State or
local radiological authorities.
(c) An aircraft in which Class 7 (radioactive) 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 determined that any radioactive substances present do not meet the definition of radioactive material, as defined
in Section 173.403 of this subchapter, and it is
determined in accordance with Section 173.443
of this subchapter that the dose rate at
every accessible surface must not exceed 0.005 mSv per hour (0.5 mrem per
hour) and there is no significant removable 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-

Section 175.900

nation and the extent to which Class 7
materials are transported.
(e) In addition to the reporting requirements of (SectionSection 171.15 and 171.16 of
this subchapter and Section 175.31 of this part,
an aircraft operator shall notify the offeror at the earliest practicable moment following any incident in which
there has been breakage, spillage, or
suspected radioactive contamination
involving Class 7 (radioactive) materials shipments.
[71 FR 14604, Mar. 22, 2006, as amended at 79
FR 40618, July 11, 2014; 80 FR 1164, Jan. 8,
2015]

Section 175.706 Separation distances for undeveloped film from packages containing Class 7 (radioactive) materials.
No person may carry in an aircraft
any package of Class 7 (radioactive)
materials required by Section 172.403 of this
subchapter to be labeled Radioactive
Yellow-II or Radioactive Yellow-III
closer than the distances shown in the
table below to any package marked as
containing underdeveloped film.

Minimum separation distance to nearest undeveloped film for various times in transit
Transport
index

Up to 2 hours
Meters

0.1 to 1.0 .......
1.1 to 5.0 .......
5.1 to 10.0 .....
10.1 to 20.0 ...
20.1 to 30.0 ...
30.1 to 40.0 ...
40.1 to 50.0 ...

2 to 4 hours

Feet

0.3
0.9
1.2
1.5
2.1
2.4
2.7

Meters
1
3
4
5
7
8
9

4 to 8 hours

Feet

0.6
1.2
1.8
2.4
3
3.3
3.6

Meters

2
4
6
8
10
11
12

Section 175.900 Handling requirements
carbon dioxide, solid (dry ice).

0.9
1.8
2.7
3.6
4.5
5.1
5.7

for

Carbon dioxide, solid (dry ice) when
shipped by itself or when used as a refrigerant for other commodities, may
be carried only if the operator has
made suitable arrangements based on
the aircraft type, the aircraft ventilation rates, the method of packing and
stowing, whether animals will be carried on the same flight and other factors. The operator must ensure that
the ground staff is informed that the
dry ice is being loaded or is on board
the aircraft. For arrangements between
the shipper and operator, see Section 173.217 of

8 to 12 hours

Feet
3
6
9
12
15
17
19

Meters

Over 12 hours

Feet

1.2
2.4
3.3
4.8
6
6.6
7.2

4
8
11
16
20
22
24

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1.5
3.3
4.5
6.6
8.7
9.9
10.8

Feet
5
11
15
22
29
33
36

this subchapter. Where dry ice is contained in a unit load device (ULD) prepared by a single shipper in accordance
with Section 173.217 of this subchapter and the
operator after the acceptance adds additional dry ice, the operator must ensure that the information provided to
the pilot-in-command and the marking
on the ULD when used as a packaging
reflects that revised quantity of dry
ice.
[82 FR 15892, Mar. 30, 2017]

847

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