Text in force at 23-63: from 23-43, effective 10 May 1993.
[(a) Each exhaust system must be fireproof and corrosion-resistant, and must have means to prevent failure due to expansion by operating temperatures.
(b) Each exhaust system must be supported to withstand the vibration and inertia loads to which it may be subjected in operation.
(c) Parts of the system connected to components between which relative motion could exist must have means for flexibility.]
58 FR 18974 · Source