Propeller Problems

The following is derived from maintenance facility submissions to the FAA’s Service Difficulty Reports database.

Key Takeaways:

• Propeller malfunctions reported include oil leaks, excessive vibrations, and unexpected feathering, indicating diverse failure modes.
• Causes ranged from worn internal components (actuating pistons, vent systems) and dynamic imbalance to improper repairs or manufacturing defects.
• These incidents often necessitated significant maintenance, such as part replacement, re-sealing, dynamic balancing, or extensive disassembly and repair, with one leading to an emergency landing.

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