115. In granting seaman’s sick leave,
(a) the medical certificate which reports that the illness or injury incurred in performing duties shall be accompanied;
(b) the master of a ship shall believe that the illness or injury is not due to one of the following causes:
(i) the illness or injury is due to the seaman’s voluntary act or negligence;
(ii) the illness or injury is more serious due to the seaman’s voluntary act than before;
(iii) the illness or injury is due to drunkenness or other self indulgence;
(iv) the illness or injury is due to the causes not relating to the performance of duties;
(v) the illness or injury is due to the seaman’s own carelessness or inexperience.