Question 81Gas Turbine - 1st Asst/Chief

The correct answer is A) Both the pinion and gear should be relieved of all raised metal around the indentation. When both the pinion and gear teeth have been slightly indented by foreign material, the proper action is to remove the raised metal around the indentations. This helps prevent further damage and spread of the indentations, which could ultimately lead to failure of the reduction gear. Leaving the indentations as-is or simply removing the foreign material is not sufficient, as the raised metal around the indentations can continue to cause issues. Replacing the entire pinion and gear is an overly extreme measure in this case, as the damage appears to be relatively minor.