(a) In accordance with the provisions of section 6(a) of the Longshoremen's Act as incorporated by section 422(a) of the act, and except as provided in § 725.503A, the provisions of this section shall be applicable in determining the date from which benefits are payable to an eligible claimant.
(b) In the case of a miner who is totally disabled due to pneumoconiosis, benefits are payable to such miner beginning with the month of onset of total disability. Where the evidence does not establish the month of onset, benefits shall be payable to such miner beginning with the month during which the claim was filed, or the month during which the claimant elected review under Part 727 of this subchapter.
(c) Except as is provided in Part 727 of this subchapter, in the case of a survivor of a miner who died due to or while totally disabled by pneumoconiosis, benefits shall be payable beginning with the month of the miner's death, or January 1, 1974, whichever is later.
(d) No benefits shall be payable with respect to a claim filed between July 1 and December 31, 1973 (a section 415 claim), for any period of eligibility prior to July 1, 1973 (or January 1, 1974 if the claim is approved under Part 727 of this subpart), nor shall any benefits be payable with respect to such claim pursuant to the provisions of section 415 of part B of title IV of the act for any period of eligibility after December 31, 1973. Where in the case of a section 415 claim, eligibility continues beyond December 31, 1973, benefits for periods of eligibility occurring after such date shall be payable under part C of title IV of the act.
(e) No benefits shall be payable with respect to a claim filed after December 31, 1973 (a part C claim), for any period of eligibility occurring before January 1, 1974.
(f) Each decision and order awarding benefits shall indicate the month from which benefits are payable to the eligible claimant.