(a) Notice of an appeal shall be in writing and mailed or otherwise furnished to the Board within 90 days from the date of receipt of a contracting officer's decision. A copy of the notice shall be furnished to the contracting officer from whose decision the appeal is taken.
(b) Where the contractor has submitted a claim of $50,000 or less to the contracting officer and has requested a written decision within 60 days from receipt of the request, and the contracting officer has not done so, the contractor may file a notice of appeal as provided in paragraph (a) of this section citing the failure of the contracting officer to issue a decision.
(c) Where the contractor has submitted a claim in excess of $50,000 to the contracting officer and the contracting officer has failed to issue a decision within a reasonable time, the contractor may file a notice of appeal as provided in paragraph (a) of this section, citing the failure to issue a decision.
(d) Upon docketing of appeals filed pursuant to paragraph (b) or (c) of this section, the Board, at its option, may stay further proceedings pending issuance of a final decision by the contracting officer within the time fixed by the Board or order the appeal to proceed without the contracting officer's decision.