Which methods may be used to inspect fiberglass/honeycomb structures for entrapped water?

The correct answer encompasses all the listed methods because each one is effective in detecting entrapped water within fiberglass and honeycomb structures, which is crucial for maintaining the integrity and performance of these materials.

Acoustic emission monitoring can identify the sound waves generated by moisture movement or structural changes within the material, indicating potential areas where water may be trapped. This method is non-invasive and can provide real-time information about the health of the structure.

X-ray inspection is another valuable tool, as it allows for the visualization of internal features of composite structures. By analyzing the X-ray images, inspectors can identify anomalies such as moisture pockets or air voids that indicate the presence of water within the material.

Backlighting involves using a light source to illuminate the material. This technique can make it easier to spot inconsistencies in the fiberglass or honeycomb structure, which could signify entrapped water or other defects.

Utilizing all of these methods provides a comprehensive approach to inspect and ensure the integrity of fiberglass and honeycomb structures, enabling effective maintenance and preventing structural failures.