Abstract: Bolted together first and second flanges include bolts disposed through first bolt holes in the first flange. The bolts extend at least partially through second holes in the second flange. Bolt include bolt heads, threads, and shanks therebetween. Crushable spacers disposed around the shanks of a first plurality of the bolts and contacting and axially extending between the bolt heads and the first flange. Bushings disposed around a second plurality of the bolts and contacting and axially extending between the bolt heads and the second flange. A shank outer diameter may be smaller than a thread diameter and heat shrink tubing may be disposed around the bolt shanks of at least some of the spacers. First bolt holes may extend into an open annular slot on first flange and second holes may extend partially through a forward extending annular rail of second flange with rail received within slot.

Abstract: Bolted together first and second flanges include bolts disposed through first bolt holes in the first flange. The bolts extend at least partially through second holes in the second flange. Bolt include bolt heads, threads, and shanks therebetween. Crushable spacers disposed around the shanks of a first plurality of the bolts and contacting and axially extending between the bolt heads and the first flange. Bushings disposed around a second plurality of the bolts and contacting and axially extending between the bolt heads and the second flange. A shank outer diameter may be smaller than a thread diameter and heat shrink tubing may be disposed around the bolt shanks of at least some of the spacers. First bolt holes may extend into an open annular slot on first flange and second holes may extend partially through a forward extending annular rail of second flange with rail received within slot.

Abstract: A method and system for monitoring the condition of a bearing mounted on a rotating shaft, particularly one present in an aircraft gas turbine engine, where the vibration sensor that monitors the bearing is remote therefrom but proximate to the rotating shaft. The vibration sensor obtains a broadband signal having frequencies that include the bearing defect peak of the monitored bearing. The broadband signal is analyzed to identify the presence of the bearing defect peak. If the bearing defect peak is present, the amplitude of this peak is quantified to determine whether degradation of the monitored bearing has at least reached a threshold criteria previously established.

Abstract: A method and system for monitoring the condition of a bearing mounted on a rotating shaft, particularly one present in an aircraft gas turbine engine, where the vibration sensor that monitors the bearing is remote therefrom but proximate to the rotating shaft. The vibration sensor obtains a broadband signal having frequencies that include the bearing defect peak of the monitored bearing. The broadband signal is analyzed to identify the presence of the bearing defect peak. If the bearing defect peak is present, the amplitude of this peak is quantified to determine whether degradation of the monitored bearing has at least reached a threshold criteria previously established.