EASA SIB 2008-37
FAA SAIB NE-08-20 - Possible failures of variable pitch propellers due to inadequate propeller maintenance
Summary
FAA Special Airworthiness Information Bulletin (SAIB) NE-08-20 is an informational bulletin addressing possible failures of variable pitch propellers due to inadequate maintenance. It applies to propellers installed on general aviation aircraft in Normal, Utility, Acrobatic categories (14 CFR Part 22 and 23) and Transport category aircraft (Part 25). The bulletin highlights risks associated with neglecting propeller maintenance, especially corrosion and hidden internal defects, which can lead to propeller failure and loss of aircraft control.
What Changed
This SAIB introduces recommendations to mitigate risks of propeller failures by emphasizing adherence to manufacturers' maintenance and overhaul schedules, including calendar and flight hour limits. It clarifies that while compliance with overhaul intervals is not mandatory for Part 91 operators, neglecting maintenance can result in serious safety hazards. The bulletin also warns against cosmetic painting that may conceal structural flaws and stresses the importance of proper inspections and repairs.
Why It Matters
This bulletin is important for aviation professionals because propeller failures, though rare, can have severe consequences including loss of aircraft control. Operators, maintenance personnel, and inspectors must recognize the critical need for timely and thorough propeller maintenance to prevent corrosion-related fatigue cracks and hidden internal damage. Understanding and following these recommendations helps maintain propeller airworthiness and reduces accident risk.
What To Do
Operators and maintenance personnel should follow propeller manufacturers' recommended calendar and flight hour limits for inspections and overhauls. Any evident damage or corrosion must be addressed immediately rather than deferred until scheduled maintenance. Avoid painting over surface flaws without proper repair and inspection, and verify propeller maintenance history carefully before signing off inspections or purchasing aircraft.
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