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Section §173.27: General requirements for transportation by aircraft

Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above. If you do not see any guidance or interpretation information below, that means there is none available for the given part/section. Return to the search page to browse additional regulations sections.

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Additionally PHMSA has Hazardous Materials FAQs based on letters of interpretation on the following topics:

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

A written regulatory interpretation, response to a question, or an opinion concerning a pipeline safety issue may be obtained by submitting a written request to the Office of Pipeline Safety (PHP–30), PHMSA, U.S. Department of Transportation, 1200 New Jersey Avenue SE., Washington, DC 20590–0001 or at the email address: In addition to email address, the requestor must include his or her return address and should also include a daytime telephone number. Requests should be submitted at least 120 days before the time the requestor needs a response.

Note: electronic submission is provided as alternative to the 49 CFR Part 190.11(b) mail-in requirement.

The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to

View section 173.27 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
20-0054 Defense Logistics Agency Joshua Hess View
11-0020 Department of the Air Force Ms. Robbin L. Miller View
18-0064 Ten-E Packaging Services Robert Ten Eyck View
18-0013 Environmental Resource Center Kristie Absher View
17-0105 HAMATEAM, Inc Paul Dambek View
15-0140 Inmark Packaging Mr. Jay Johnson View
11-0165R Thermofisher Ms. Melissa Russell View
15-0140 Inmark Packaging Mr. Jay Jonson
11-0165R Thermofisher Ms. Melissa Russell View
03-0067 Elemental Container, Inc. Mr. Benoit Ramet View
03-0163 Defense Logistics Agency Ms. Janet Cravener View
12-0100 Hilti North America Mr. Brandon Kapple View
11-0047 HMT Associates, L.L.C. Mr. Edward A. Altemos View
12-0113 Steris Mr. Kevin Corson View
11-0204 Law Offices of James Kean Mr. James Campbell Kean View
11-0164 UPS Mr. Samuel Elkind View
11-0020 Department of the Air Force Ms. Robbin L. Miller View
11-0165 Thermofisher Ms. Melissa Russell View
13-0094 UPS Mr. Samuel Elkind View
15-0144 Labelmaster Services Mr. Robert Richard View
13-0119 Kurt J. Lesker Company Mr. Lew Miller View
12-0018 United Parcel Service (UPS) Mr. Bob Cogen View
05-0269 ASTAR Air Cargo Inc. Mr. Gerry G. Kefalinos View
12-0014 Billco Manufacturing Ms. Kattie M. Barthlow View
14-0225 Dangerous Goods Advisory Council Mr. Delmer Billings View
07-0174 Citronix, LP Mr. Chris A. DuBois View
14-0156 URS Corporation Mr. Andrew Romach View
00-0253 Defense Logistics Agency Ms. Linda McCarthy View
10-0214 DGM USA Atlanta Mr. Jim Shimko View
06-0228 Northern Air Cargo, Inc. Mr. Mark Smith View
16-0010 Mr. Jason Miller View
03-0025 HAZMATPAC Certified Packaging Mr. Donald H. Hausmann View
05-0002 Raytheon -SAS Mr. Donald E. Burke View
15-0152 DiSorb Systems, Inc Mr. Ted McLaughlin View
14-0171 Institute of Makers of Explosives Ms. Cynthia Hilton View
09-0205 URS Corporation Ms. Erin N. Jarman View
04-0023 Haas TCM Mr. Larry Holcombe View
02-0025 LPS Industries, Inc. Gary Flaherty View
04-0011 Ten-E Packaging Services, Inc. Mr. Robert J. Ten Eyck View
11-0141 Kajuligan Corporation Mr. Clifford Croft View
13-0063 Mr. Andrew Walleck View