scope:

Definitions. (a) This part contains the definitions for certain words and phrases used throughout this subchapter (49 CFR parts 105 through 110). At the beginning of each subpart, the Pipeline and Hazardous Materials Safety Administration (''PHMSA'' or ''we'') will identify the defined terms that are used within the subpart-by listing them-and refer the reader to the definitions in this part. This way, readers will know that PHMSA has given a term a precise meaning and will know where to look for it.

(b) Terms used in this part are defined as follows:

Approval means a written authorization, including a competent authority approval, issued by the Associate Administrator, the Associate Administrator's designee, or as otherwise prescribed in the HMR, to perform a function for which prior authorization by the Associate Administrator is required under subchapter C of this chapter (49 CFR parts 171 through 180).

Associate Administrator means Associate Administrator for Hazardous Materials Safety, Pipeline and Hazardous Materials Safety Administration.

Competent Authority means a national agency that is responsible, under its national law, for the control or regulation of some aspect of hazardous materials (dangerous goods) transportation. Another term for Competent Authority is ''Appropriate authority'' which is used in the International Civil Aviation Organization's (ICAO) Technical Instructions for the Safe Transport of Dangerous Goods by Air. The Associate Administrator is the United States Competent Authority for purposes of 49 CFR part 107.