The FAA went along with the recommendation on November 7, issuing an emergency airworthiness directive “prompted by analysis performed by the manufacturer.” The bulletin told pilots and airlines that if an erroneous input is received from the angle-of-attack sensor, “there is a potential for repeated nose-down trim commands of the horizontal stabilizer” and, in the anodyne language of aviation, “possible impact with terrain.” It still made no mention of the MCAS software responsible for the malfunction.
