; (D) the date of approval of the relevant type design and the date of issuance of the airworthiness directive; (E) any corrective action mandated to address the identified unsafe condition; (F) the period of time specified for the incorporation of the corrective action, during which the affected products were allowed to operate before the unsafe condition was corrected; and (G) the total cost of compliance estimated in the final rule adopting the airworthiness directive. (b) Coordination In conducting the study under subsection (a), the Administrator shall coordinate with, and solicit comments from, union representatives of the aviation safety engineers involved in the development of airworthiness directives. (c) Report to Congress Not later than 1 year after the date of enactment of this section, the Administrator shall submit to the appropriate committees of Congress a report that includes— (1) the results of the study conducted under subsection (a); (2) a description of any root cause of unsafe conditions identified by such study, as well as an identification of any action required to address any such root cause; (3) the union representative comments solicited under subsection (b)