Electrical power distribution in each SRB consists of orbiter supplied main DC bus power to each SRB via SRB buses labeled A, B and C. Orbiter main DC buses A, B and C supply main DC bus power to corresponding SRB buses A, B and C. In addition, orbiter main DC bus C supplies backup power to SRB buses A and B, and orbiter bus B supplies backup power to SRB bus C. This electrical power distribution arrangement allows all SRB buses to remain powered in the event one orbiter main bus fails.
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As a Resource Analyst at NASA's Comptroller's Office, Richard C. Cook was responsible for assessing the budgetary implications of the Solid Rocket Boosters (SRBs), External Tank, and Centaur Upper Stage of the Space Shuttle program.