Which procedure is important for maintaining aircraft integrity?

Frequent visual inspections are essential for maintaining aircraft integrity because they help identify signs of wear, damage, or deterioration before they escalate into serious issues. These inspections allow technicians to catch potential problems such as corrosion, structural cracks, and leaks early on, ensuring that all components are functioning properly and safely.

Visual inspections are an integral part of an aircraft's routine maintenance program, as they provide an opportunity to evaluate both the external and internal condition of various aircraft systems and structures. By performing these inspections regularly, technicians can make informed decisions about necessary repairs or preventative measures, significantly enhancing the safety and longevity of the aircraft.

Other options like regular washing with any cleaner or the use of abrasive materials for cleaning do not contribute positively to maintaining aircraft integrity, as they can potentially damage surfaces or leave residues that impact performance. Similarly, while the application of protective coatings is beneficial, it does not replace the need for regular inspections to monitor the ongoing condition of the aircraft. Regular visual inspections remain the frontline defense in sustaining aircraft integrity.