What does a "C" next to a step in the daily card indicate?

The presence of a "C" next to a step in the daily card indicates a corrosion-prone area. This notation serves as an important reminder to personnel that specific attention should be paid to these areas due to their susceptibility to corrosion, which can significantly impact the longevity and safety of the aircraft. Regular checks in these areas help to identify and mitigate any corrosion before it can lead to more serious issues.

In maintenance and aviation environments, recognizing corrosion-prone areas is crucial for maintaining the integrity of the aircraft. Various environmental factors such as humidity and temperature can accelerate corrosion, making it essential for the maintenance team to address these zones proactively during inspections and routine checks.