Which action is a Powerplant-rated mechanic permitted to perform on a propeller?

• A. Replace the propeller with a new unit
• B. Bend the engine crankshaft to adjust alignment
• C. Check the track of the propeller blades
• D. Rebuild the propeller hub with non-approved parts

Answer: (C)

A powerplant-rated mechanic is expected to perform inspection and routine maintenance tasks on propellers, including verifying their alignment. Checking the track of the propeller blades means measuring how the blade tips align as the prop rotates to detect any runout or misalignment. This is a non-destructive, diagnostic activity done with standard gauges, and it helps ensure the propeller runs true and vibrations are minimized, which is essential for safe operation.

Replacing the propeller with a new unit goes beyond routine inspection and maintenance and typically requires overhaul or replacement procedures that involve specialized certifications and overhaul facilities. Bending the engine crankshaft to adjust alignment would damage engine internals and is not a permissible adjustment. Rebuilding the propeller hub with non-approved parts violates airworthiness requirements since only approved parts and procedures may be used.