The Environmental Protection Agency is taking final action to grant a specific exemption from requirements to petition the Agency in order to import used ozone-depleting substances. The exemption would apply to entities that import spherical pressure vessels containing halon 1301 for aircraft fire extinguishing ("aircraft halon bottles") for purposes of hydrostatic testing. This final rule reduces the administrative burden on entities that are importing aircraft halon bottles for the purpose of maintaining these bottles to meet commercial safety specifications and standards set forth in airworthiness directives of the Federal Aviation Administration. This action does not exempt entities that import bulk quantities of halon-1301 in containers that are being imported for other purposes.