The FAA moved first, ordering checks on 787s in late July. EASA followed with a similar mandate before adopting the broader Transport Canada measure.
The FAA’s more extensive order could differ from the Canadian directive. U.S. regulations require ELTs for many types of operations, but not scheduled airline service. This gives the FAA room to offer airlines the option of deactivating the units to mitigate ELT-related fire risks, as the agency did in its 787 AD.
U.S. operators serving countries that require ELTs cannot take advantage of the deactivation option.