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The chief service difficulty with honeycomb sandwich in aircraft is

  • A.Water ingress and facesheet disbonding
  • B.Its low bending stiffness
  • C.Its high density
  • D.Its inability to carry any shear

Answer: A

Moisture that finds its way past a damaged facesheet collects in the cells, adds weight, and freezes and expands at altitude, driving the skin off the core. Detecting a disbond is not straightforward, which is why tap testing and ultrasonic inspection are routine.

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