; and (4) provide recommendations on measures to adopt to mitigate against such risks and ensure that any use of CVR data serves the sole purpose of a safety investigation, including recommendations for the United States to make to ICAO to mitigate these risks. 10. Transparency in aircraft maintenance and repair work (a) In general Not later than 1 year after the date of enactment of this Act, the Administrator shall update the guidelines of the FAA for part 121 certificate holders in implementing a Continuing Analysis and Surveillance System (CASS) for their air carrier maintenance programs to include reporting no less than once every 6 months by certificate holders to the FAA of any failure to follow procedures in aircraft maintenance as well as any major alteration, complete overhaul, or repair of mechanical irregularities of each airframe, engine, propeller, and appliance. (b) Advisory Not later than 1 year after the date of enactment of this Act, the Administrator shall issue an advisory with formatting guidelines for air carriers to report information as required under subsection (a). (c) Inclusion For each instance of a failure to follow procedures and for each major alteration, overhaul, or repair reported under the requirements of this section, the Administrator shall require certificate holders to include any name and any physical address where the work is carried out for each maintenance provider that performs work. (d) Notifications to the NTSB The Administrator shall notify the National Transportation Safety Board of each instance identified in carrying out subsection (c) of this section and shall share with the National Transportation Safety Board all information it gathers in relation to each such instance. (e) Unscheduled landings due to mechanical issues (1) In general Each Certificate Management Office within the FAA shall immediately notify the National Transportation Safety Board in any instance in which a part 121 air carrier falling under its supervision completes an unscheduled landing at