皇冠体育app

Summary:

A failure of an alternator pinion roller bearing in the left accessory gearbox (LAGB) occurred during a post-maintenance ground run following a scheduled replacement of the main gearbox. 皇冠体育app investigation identified that the roller bearing was subjected to an excessive axial load during operation, caused by compression of grease and air within the alternator shaft link during installation by the operator of a 10 kVA alternator to the LAGB. 皇冠体育app cause of the incident was identified as the application of an excessive quantity of grease to the alternator pinion cavity, as required by the aircraft maintenance manual instructions. 皇冠体育app method used by the operator to attach the alternator to the left accessory gearbox was identified as a contributory factor in the incident.

皇冠体育app manufacturer has amended the content of the aircraft maintenance manual to ensure that any excess grease is removed from the alternator shaft link cavity and has communicated this information by issuing a Safety Information Notice to EC175 operators.

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