EASA SIB 2013-14R1: SAAB SF340A and 340B Aeroplanes - Aileron Bell Crank Bearing Failure

What to do

Operators of SAAB SF340A and 340B aeroplanes should follow the instructions in SAAB Service Bulletin 340-27-069 and apply the specified lithium grease to control bearing corrosion. No mandatory inspections are required, but continued monitoring and adherence to SAAB maintenance guidance are advised. For technical questions, contact SAAB support or EASA Safety Information Section.

Summary

EASA Safety Information Bulletin 2013-14R1 addresses the aileron bell crank bearing failure issue on SAAB Model SF340A and 340B aeroplanes. It discusses the introduction of greasable bearings and improved lithium grease to mitigate corrosion caused by exposure to de-icing fluids. The bulletin clarifies that the bearing corrosion is detectable by flight crews but does not pose a direct safety risk requiring mandatory maintenance actions.

What changed

This revision of EASA SIB 2013-14 removes the previous recommendation for detailed visual inspections of the aileron bell crank bearings on certain SAAB 340 aeroplanes. It also confirms that the corrosion issue does not warrant an Airworthiness Directive under current regulations. The bulletin now emphasizes the use of improved lithium grease as per SAAB service instructions.

Why it matters

For aviation professionals, this bulletin informs operators and maintenance organizations that aileron bell crank bearing corrosion, while detectable, is not considered an unsafe condition requiring mandatory inspections or directives. This reduces unnecessary maintenance burdens and focuses attention on using the correct grease to prevent corrosion. Compliance teams can prioritize recommended practices without regulatory enforcement.

What to do

Summary

What changed

Why it matters

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