Contiguous hull structure: Heating system.

The heating system for transverse and longitudinal contiguous hull structure must: (a) Be shown by a heat load calculation to have the heating capacity to meet § 154.174(b)(2) or § 154.176(b)(2); (b) Have stand-by heating to provide 100% of the required heat load and distribution determined under paragraph (a); and (c) Meet Parts 52, 53, and 54 of this chapter.