9. In Way of Engine Bed Plates or Thrust Blocks
In way of engine bed plates or thrust blocks which are bolted directly to the inner bottom, the thickness of the inner bottom plating is to be at least 19.0 mm (0.75 in.). This thickness may be required to be increased according to the size and power of the engine(s). Holding-down bolts are to pass through angle flanges of
sufficient breadth to take the nuts.