What is a typical symptom of bearing wear in a gas turbine engine and how would you verify it?

• A. Decreased vibration and cooler oil; verify with temperature monitoring.
• B. Increased fuel flow; verify with fuel flow meter.
• C. Increased vibration and oil temperature; verify with vibration analysis, oil analysis, and borescope check.
• D. No change in vibration; verify with exhaust gas temperature.

Answer: (C)