Section 137.310 - External survey program(a) The owner or managing operator of a towing vessel that has selected the TSMS option and who has chosen to demonstrates compliance through an external survey program must:(1) Have the vessel examined by a surveyor from a TPO at the intervals prescribed in § 137.300 ;(2) Ensure the examination is conducted in accordance with § 137.325 ;(3) Ensure the TSMS applicable to the vessel includes policies and procedures for complying with this section; and(4) Make the applicable sections of the TSMS available to the surveyor.(b) The drydock examination and internal structural examination must be documented in a report that contains the information required in § 137.135 .