Question 139General Subjects - 1st Asst/Chief

The correct answer is C) Bimonthly. On a bearing using an oiling ring as a means of static oil feed, the bottom of the bearing sump should be drained of impurities bimonthly (every two months). This is typically specified in the manufacturer's maintenance recommendations for this type of bearing lubrication system. Draining the sump bimonthly helps remove any accumulated contaminants or debris that could otherwise degrade the oil and cause premature wear on the bearing. The other options are incorrect because draining the sump every round or daily would be overly frequent, while draining it annually would be too infrequent to effectively maintain the bearing's lubrication.