In addition to sequential numbering of cases as received, each case formally handled by the Board will receive a letter prefix. These letter prefixes reflect the case type: ``SE'' for safety enforcement (certificate suspension/revocation) cases; ``SM'' (safety medical) for cases involving denials of medical certification; ``CD'' for cases involving non-medical certificate denials; ``SR'' for cases involving safety registration issues under 49 U.S.C. 44101 et seq.; ``CP'' for cases involving the imposition of civil penalties; ``NA'' for cases in which a petition for review or appeal is not accepted because of a patent procedural deficiency; and ``EAJA'' for cases involving applications for fees and expenses under the Equal Access to Justice Act, governed by Part 826.