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Silicone Sensor Light / Pliable / Self-adhesive / Inexpensive 1 cm 1 cm CV Switch no crack Test Piece Fatigue, torsion, vibration, etc Silicone sensor (self adhesive) Tubing (PTFE) Vacuum Terminals - Stop test - Or alarm - Or send signal Pressure Switch Sensor gallery Side View •No crack breaching vacuum in sensor gallery •Switch contact remains open Structural Monitoring Systems Proprietary CV Switch crack detected Tubing (PTFE) Vacuum Pressure Switch Crack Plan View •Surface Crack breaches sensor gallery •Switch contacts close •Test stopped / alarm signal / remote signal sent…… Structural Monitoring Systems Proprietary Test Lab Setup DIN mounted CV Switches Pulsing Rig Test Set-up Test Lab Setup •Shorter design / verify cycles •Less labor intensive •More accurate crack initiation detection •Cycle count when crack is < 1mm CVM benefits • Shorter design / verify cycle • More accurate crack detection - cycle count at <1mm crack • Less labor required • Better testing facility utilisation ATSB TRANSPORT SAFETY REPORT Aviation Occurrence Investigation AO-2008-070 Interim Factual In-flight upset 154 km west of Learmonth, WA 7 October 2008 VH-QPA Airbus A330-303
