Traffic Collision Avoidance Systems (TCAS) and Terrain Awareness and Warning Systems (TAWS) are much like any other avionics device, except that if they are not functioning properly, the pilots may not know until it is too late. That is why maintainers need to be aware of how these systems work and ensure they operate correctly. They are lifesavers. On Aug. 31, 1986, a Piper Archer climbing out from Torrance (Calif.) Airport (TOA) collided with an Aeroméxico DC-9 that was on approach to ...


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