From the ACR Electronics FAQ:

Quote:
Can I take my beacon with me on an aircraft?

You may wish to check with the airline about any restrictions or documentation that you may need to carry with the unit. We suggest that you print a copy of the MSDS and bring it with you. We also recommend that you carry the Product Support Manual to explain what the unit is (MSDS sheets and Manuals can be found on the product web page).


http://www.acrelectronics.com/support/faqs/personal-locator-beacon-faqs/