(a) Yes, the Secretary may request an extension of time before the expiration of the 60-day review period. The Tribe/Consortium may either grant or deny the Secretary's request for an extension. To be effective, any grant of extension of time must be in writing and be signed by the person authorized by the Tribe/Consortium to grant the extension before the expiration of the 60-day review period.

(b) The deadline described in paragraph (a) of this section may be extended for any additional length of time as agreed upon in writing by the Tribe/Consortium and the Secretary, and

(c) The 60-day period may be extended up to 30 days for circumstances beyond the control of the Secretary, upon written request from the Secretary to the Tribe/Consortium.

(d) A Tribe/Consortium must respond within 10 days of receiving the Secretary's request for an extension under paragraph (c) of this section.