decision to impose a major adverse action shall be received within seven business days after the date of service of the written decision on the covered employee. (4) Timing The aggregate period for the resolution of charges against an employee under this subsection may not exceed 15 business days. (5) Supercession of any collective bargaining agreement The procedures in this subsection shall supersede any collective bargaining agreement to the extent that such agreement is inconsistent with such procedures. (c) Procedures of Appeals before the Board (1) Initial determination When the Board convenes to consider an appeal in a case under this section, the Board, before proceeding to consider the merits of the appeal, shall determine whether the case is properly before it. (2) Decisions by the Board Upon hearing such an appeal, the Board shall, with respect to each charge appealed to the Board, sustain the charge, dismiss the charge, or sustain the charge in part and dismiss the charge in part. If the deciding official is sustained (in whole or in part) with respect to any such charge, the Board shall— (A) approve the action as imposed