NTSB Safety Alert: Aluminum Propeller Blades
Posted: Sat May 18, 2024 8:24 am
The NTSB has investigated several accidents and incidents where a failure to properly inspect and repair small damage to aluminum propeller blades resulted in propeller blade fatigue cracking and fractures. Aluminum propeller blades can be susceptible to fatigue cracking and fracture if a small nick, pit, or corrosion on the surface or edge is not found and repaired during preflight inspection or maintenance. Such damage can concentrate stress from normal airplane operation loads, resulting in fatigue crack initiation and growth followed by propeller blade fracture.
To address this issue, the NTSB recently issued SA090, available at https://www.ntsb.gov/Advocacy/safety-al ... /SA090.pdf. The alert directs owners, operators, and pilots to inspect all areas of the propeller blade, including the back/face side of the blade and the leading edge, for damage such as nicks or corrosion. Any findings should be referred to a qualified mechanic for inspection and repaired before further flight.
For additional information, review AC 20-37E, Aircraft Propeller Maintenance and AC 43.13-1B, Acceptable Methods, Techniques, and Practices – Aircraft Inspection and Repair at https://drs.faa.gov/browse .
To address this issue, the NTSB recently issued SA090, available at https://www.ntsb.gov/Advocacy/safety-al ... /SA090.pdf. The alert directs owners, operators, and pilots to inspect all areas of the propeller blade, including the back/face side of the blade and the leading edge, for damage such as nicks or corrosion. Any findings should be referred to a qualified mechanic for inspection and repaired before further flight.
For additional information, review AC 20-37E, Aircraft Propeller Maintenance and AC 43.13-1B, Acceptable Methods, Techniques, and Practices – Aircraft Inspection and Repair at https://drs.faa.gov/browse .