An employee may voluntarily submit a written request to his or her agency that a specified number of hours of his or her accrued annual leave, consistent with the limitations in §630.1110, be transferred from his or her annual leave account to an emergency leave transfer program established under §630.1103. An emergency leave donor may not donate annual leave for transfer to a specific emergency leave recipient under this subpart. Donated annual leave not used by an emergency leave recipient must be returned to the emergency leave donor(s) and/or leave banks as provided in §630.1117.