Question 81Gas Turbine - 1st Asst/Chief
70% to passIn cases where both the pinion and gear teeth of the main reduction gear have been slightly indented by foreign material, what action should you take?
ABoth the pinion and gear should be relieved of all raised metal around the indentation.
BClosely monitor the damage to see if it spreads.
CRemove the foreign material that caused the indentation and return the unit to service.
DReplace both the pinion and gear.
AI Explanation
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.
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