---
kind: "section"
citation: "49 C.F.R. § 175.701"
title: "49"
number: "175.701"
heading: "Separation distance requirements for packages containing Class 7 (radioactive) materials in passenger-carrying aircraft."
url: "https://uscodex.org/cfr/49/175.701"
---

# §175.701. Separation distance requirements for packages containing Class 7 (radioactive) materials in passenger-carrying aircraft.

- (a) The following table prescribes the minimum separation distances that must be maintained in a passenger-carrying aircraft between Class 7 (radioactive) materials labeled RADIOACTIVE YELLOW-II or RADIOACTIVE YELLOW-III and passengers and crew:
- (b) When transported aboard passenger-carrying aircraft packages, overpacks or freight containers labeled Radioactive Yellow-II or Radioactive Yellow-III must be separated from live animals by a distance of at least 0.5 m (20 inches) for journeys not exceeding 24 hours, and by a distance of at least 1.0 m (39 inches) for journeys longer than 24 hours.
- (c) Except as provided in [paragraph (d)](#d) of this section, the minimum separation distances prescribed in paragraphs [(a)](#a) and [(b)](#b) of this section are determined by measuring the shortest distance between the surfaces of the Class 7 (radioactive) materials package and the surfaces bounding the space occupied by passengers or animals. If more than one package of Class 7 (radioactive) materials is placed in a passenger-carrying aircraft, the minimum separation distance for these packages shall be determined in accordance with paragraphs [(a)](#a) and [(b)](#b) of this section on the basis of the sum of the transport index numbers of the individual packages or overpacks.
- (d) **Predesignated areas.** A package labeled RADIOACTIVE YELLOW-II or RADIOACTIVE YELLOW-III may be carried in a passenger-carrying aircraft in accordance with a system of predesignated areas established by the aircraft operator. Each aircraft operator that elects to use a system of predesignated areas shall submit a detailed description of the proposed system to the Associate Administrator for approval prior to implementation of the system. A proposed system of predesignated areas is approved if the 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 distances prescribed in [paragraph (a)](#a) of this section; and
  - (2) The predesignated areas are separated from each other by minimum distance equal to at least four times the distances required by paragraphs [(a)](#a) and [(b)](#b) of this section for the predesignated area containing packages with the largest sum of transport indexes.

## Notes

### Authority

Authority: 49 U.S.C. 5101-5128; 44701; 49 CFR 1.81 and 1.97.

### Source

Source: 71 FR 14604, Mar. 22, 2006, unless otherwise noted.