Abstract
Abstract Swivel arms in a turning gear application failed in service due to fatigue cracking. 2 out of 52 components were affected. Turning gears are mainly used to spin heavy-duty gas turbine engines rotors after shut-down to prevent distortion of the still-hot rotor. The design of the swivel arms, that was not robust enough to tolerate deviations in fabrication, was identified as the root cause of the failures.
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