(a) Unless otherwise provided, all appointments authorized to be made by the Mayor under any of the provisions of this charter shall be submitted by him or her, in writing, to the Board of Aldermen at a regular meeting for confirmation. The Board shall act upon the appointments at the next regular meeting. Such appointments shall stand confirmed unless rejected by a vote of seven members. If a person so appointed is rejected, the Mayor may appoint him or her or another person for such office and submit the same to the Board of Aldermen within one month. In no case shall the Mayor submit the same name more than twice. In case he or she fails to do so within said period, the Board of Aldermen may proceed to make such appointment, which appointment shall be valid without the consent of the Mayor.

(b) If the Mayor fails to appoint any of the officers authorized by section 15.2 or 15.3 within 90 days, then the Board of Aldermen may appoint said officers by a vote of seven members without the approval of the Mayor.

(c) The Mayor may also contract, for a period of up to one year, subject to confirmation of the Board of Aldermen, to fill a vacancy in either the Office of the Chief Engineer of the Fire Department or the Chief of Police, notwithstanding the appointment powers set forth in § 22.1 or § 23.1 of this charter.