Cages used for supporting bearings in an aero engine have been tested under simulated operating conditions. Failures of these bearing cages were recorded after the following engine running hours: 1420, 940, 2620, 705, 360, 1185, 1410, 1950, 2730, 2050, 525, 1465, 925. The total number of bearing cages tested was 64. The remaining 51 cages did not fail by the time the tests were stopped at 2730 hours. Determine: (a) the minimum life. (b) the characteristic life (after the minimum life), to the nearest 100 hours*. (c) the shape factor. From this, comment on the nature of the failure of these bearing cages.

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