EASA SIB 2008-19R2: Catalytic Oxidation of Aircraft Carbon Brakes due to Runway De-Icers

What to do

Operators and maintenance personnel should conduct detailed visual inspections of carbon brake rotors and stators during each landing gear wheel removal, checking for damage such as carbon flaking, chips, or fractures as recommended by the applicable Aircraft Maintenance Manual. No mandatory compliance deadline is set, but ongoing vigilance and adherence to inspection recommendations are advised. Stakeholders should stay informed through EASA communications for any future mandatory directives.

Summary

EASA Safety Information Bulletin 2008-19R2 addresses the catalytic oxidation of aircraft carbon brakes caused by runway de-icers, specifically affecting all large aeroplanes equipped with carbon brakes operating at airports using such chemicals. The bulletin highlights the risk posed by organic salt-based runway de-icers, such as potassium formate and acetate, which can penetrate brake components and accelerate carbon brake degradation. It also notes additional corrosion and electrical wiring issues linked to these de-icers, particularly on older aircraft.

What changed

This bulletin updates the previous version 2008-19R1 to inform stakeholders about recent developments including new test protocols (SAE AIR5567) assessing runway de-icer effects on carbon brakes and the incorporation of these tests into SAE AMS specifications. It also references the CRD 2011-201 on aerodrome winter operations recommending avoidance of harmful chemicals. EASA continues to monitor the issue and may consider future mandatory actions if airport measures are insufficient.

Why it matters

The information is critical for aviation professionals as catalytic oxidation can reduce carbon brake life and effectiveness, potentially leading to brake failure during high-speed aborted takeoffs or excessive vibration during ground operations. Maintenance and operations teams must be aware of these risks to prevent safety hazards and avoid costly repairs. Additionally, corrosion and electrical wiring degradation caused by runway de-icers pose further safety and maintenance challenges.