(Produced/Editing By Eric Blair) The antiquated conventional Spindle/Axle nut deficiencies on aircraft are costing you more than is imaginable. The NTSB documented a report on 5 catastrophic wheel end failures, which resulted in 7 fatalities in the trucking industry. The axle nut was the problem. However, at the time of the report, no one understood the significance or the importance of the axle nut.