; (2) available data on the usage of the affected air traffic service or air navigation facility; (3) an assessment of the designated officer on the effects of the proposal; and (4) an assessment of the designated officer on any proposed action to mitigate the loss of or material reduction in access to the public-use airport or adjacent airspace. (b) Proceeding The designated officer shall provide an opportunity for public comment on the proposal for a period of at least 60 days. (c) Decision Not later than 30 days after the last day of the public comment period, the designated officer shall— (1) determine whether the proposal is in the public interest, including whether any material reduction in access to a public-use airport or adjacent airspace has been mitigated to the maximum extent practicable; and (2) approve or disapprove the proposal on that basis. (d) Relationship to other requirements Notwithstanding section 90501(c), a proposal described in subsection (a)— (1) shall be subject to the process established in this section; and (2) may not be implemented unless approved under this section. (e) Appeals and secretarial review (1) Written petition for review A petition for an appeal of a decision of the designated officer under subsection (c) shall be submitted in writing to the Secretary not later than 30 days after the date of the decision. (2) Secretarial review The Secretary shall review and make a determination with respect to a timely filed petition under paragraph (1) not later than 30 days after the date of receipt of the petition. (f) Decisional standards In making a determination under this section, neither the Secretary nor the designated officer may consider any factor not directly germane to— (1) the safe operation or navigation of an aircraft