Section 108.601 - Crane design(a) Each crane and crane foundation on a unit must be designed in accordance with the American Petroleum Institute Specification for Offshore Cranes, API Spec. 2C, Second Edition, February, 1972 (with supplement 2).(b) In addition to the design requirements of paragraph (a), each crane must have the following: (1) Each control marked to show its function.(2) Instruments with built-in lighting.(3) Fuel tank fills and overflows that do not run onto the engine exhaust.(5) Spark arrestors fitted on engine exhaust pipes.