As an automated corrective measure, the MCAS was given full authority to bring the aircraft nose down, and could not be overridden by pilot resistance against the control wheel as on previous versions of the 737.[45] Following the Lion Air accident, Boeing issued an Operations Manual Bulletin (OMB)[46] on November 6, 2018, to outline the many indications and effects resulting from erroneous AOA data and provided instructions to turn off the motorized trim system for the remainder of the flight, and trim manually instead. Until Boeing supplemented the manuals[47] and training, pilots were unaware of the existence of MCAS due to its omission from the crew manual and no coverage in training.[45] Boeing first publicly named and revealed the existence of MCAS on the 737 MAX in a message to airline operators and other aviation interests on November 10, 2018, twelve days after the Lion Air crash.[48]