Activation Of Emergency Locator Transmitter (Elt)

Abstract: Earlier available Emergency locator transmitter (ELT) is activated by internally mounted G-Switch which triggers the activation of ELT (36) after sensing G-level above a predefined level. Whenever G-level is exceeded predefined crashed G-level, ELT (36) is activated to trace the crashed FDR/Aircraft location. False triggering can be activated during heavy accelerated landing and take-off of Aircraft. Earlier ELT is also activated by water activated sensor by just touching the water surface. Water activated sensor can be activated during heavy rain fall or aircraft washing to trigger unintentional activation of ELT (36). The present invention provides a solution to mitigate the false triggering, new ELT activation circuit is designed and tested by rupture of crash sensor (Frangible sensor) (30) or by sinking in sea water with help of hydrostatic pressure sensor (29). Hydrostatic pressure sensor senses hydrostatic pressure of water with depth of 3 meter and more. To be published along with Figure-1

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