How Much Is Too Much?

Observing propeller blade service limits after minor repairs

In conclusion, when blades are measured to determine the minimum repair dimensions at any given blade station, the measurement is very critical. If the blade station measurement is off even a sixteenth of an inch when determining from a manufacturer’s table what the blade width minimum should be, too much material could conceivably be removed due to the taper of the blade, thereby rendering a blade “unairworthy.” When measurements become too close to call, it is highly recommended to send the propeller to an approved propeller repair/overhaul facility.

Lowell W. Berentsen is an assistant professor, Department of Aviation Technologies, Southern Illinois University, Carbondale, IL. Prior to teaching he worked in Alaska as an AMT on both fixed wing aircraft and helicopters.

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