Bad example for two reasons. First: Although the NTSB investigated the accident, it was unable to conclusively identify the cause of the crash. The rudder PCU

Bad example for two reasons. First: Although the NTSB investigated the accident, it was unable to conclusively identify the cause of the crash. The rudder PCU from Flight 585 was severely damaged, which prevented operational testing of the PCU.[3]:47 A review of the flight crew's history determined that Flight 585's captain strictly adhered to operating procedures and had a conservative approach to flying.[3]:47 A first officer who had previously flown with Flight 585's captain reported that the captain had indicated to him while landing in turbulent weather that the captain had no problem with declaring a go-around if the landing appeared unsafe.[3]:48 The first officer was considered to be "very competent" by the captain on previous trips they had flown together.[3]:48 The weather data available to the NTSB indicated that Flight 585 might have encountered a horizontal axis wind vortex that could have caused the aircraft to roll over, but this could not be shown conclusively to have happened or to have caused the rollover.[3]:48–49 On December 8, 1992, the NTSB published a report which identified what the NTSB believed at the time to be the two most likely causes of the accident. The first possibility was that the airplane's directional control system had malfunctioned and caused the rudder to move in a manner which caused the accident. The second possibility was a weather disturbance that caused a sudden rudder movement or loss of control. The Board determined that it lacked sufficient evidence to conclude either theory as the probable cause of the accident.[2]:ix[3]:49 This was only the fourth time in the NTSB's history that it had closed an investigation and published a final aircraft accident report where the probable cause was undetermined.[4] Second: In 2004, following an independent investigation of the recovered PCU/dual-servo unit, a Los Angeles jury, which was not allowed to hear or consider the NTSB's conclusions about the accident, ruled that the 737's rudder was the cause of the crash, and ordered Parker Hannifin, a rudder component manufacturer, to pay US$44 million to the plaintiff families.[16] Parker Hannifin subsequently appealed the verdict, which resulted in an out-of-court settlement for an undisclosed amount.