USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Interpretation Response #11-0131 ([Flightpath Services, Inc.] [Mr. Douglas Svoboda])

Below is the interpretation response detail and a list of regulations sections applicable to this response.

Interpretation Response Details

Response Publish Date:

Company Name: Flightpath Services, Inc.

Individual Name: Mr. Douglas Svoboda

Location State: NJ Country: US

View the Interpretation Document

Response text:

September 1, 2011



Mr. Douglas Svoboda

Flightpath Services, Inc.

500 Hollister Road

Teterboro, NJ 07801

Ref. No. 11-0131

Dear Mr. Svoboda:

This responds to your letter requesting clarification of the cylinder requalification provisions under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180). Specifically, you ask whether all cylinders must be requalified before refilling or just those cylinders where requalification is due or past due. Additionally, you ask if requalification is required if a cylinder installed in an aircraft rapidly discharges (e.g., emergency inflation cylinder on a life raft) before it can be returned to service.

In accordance with § 180.205(c) of the HMR, a cylinder may be requalified at any time before or during the month and year the requalification is due. A cylinder filled before the requalification becomes due may remain in service until it is emptied. A cylinder with a specified service life or past its requalification date may not be refilled and offered for transportation after its authorized service life has expired or, it is requalified, respectively.

For a cylinder installed in an aircraft that rapidly discharges, requalification is required if the conditions specified in § 180.205(d) are met. Specifically, a cylinder must be tested and inspected, without regard to any other periodic requalification requirements, prior to further use if: (1) The cylinder shows evidence of dents, corrosion, cracked or abraded areas, leakage, thermal damage, or any other condition that might render it unsafe for use in transportation; (2) The cylinder has been in an accident and has been damaged to an extent that may adversely affect its lading retention capability; (3) The cylinder shows evidence of or is known to have been over-heated; or (4) The Associate Administrator determines that the cylinder may be in an unsafe condition.

I trust this satisfies your inquiry. Please contact us if we can be of further assistance.



T. Glenn Foster

Chief, Regulatory Review and Reinvention Branch

Standards and Rulemaking Division


Regulation Sections

Section Subject
180.205 General requirements for requalification of specification cylinders