Abstract
Prototype equipment developed at the Aeronautical Research Laboratory has been installed in two Royal Australian Navy Sea King helicopters to estimate the tooth-bending fatigue usuage of critical gears in the main rotor gearbox under Australian operating conditions. The equipment is capable of monitoring actual usage of individual gearboxes in damage or life fraction terms. Some 479 h of in-flight load data covering 227 flights and eight main sortie types have been accumulated. These data have been analyzed and it has been concluded that, for practical purposes, the lives of the gears in the main rotor gearbox are not limited by fatigue. The potential of the fatigue usage monitoring system for application to individual gearboxes is examined, and desirable enhancements to the prototype equipment are discussed.
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