Two tragic airline losses in the last decade highlight the huge difference between pilot or crash-activated distress alerting, such as provided by ELTs and PLBs, and aircraft monitoring and tracking. In the case of the latter, information needs to be routinely available all the time, not just when an incident occurs.
In 2009, Air France flight 477, an Airbus A330, stalled and crashed into the Atlantic Ocean after erroneous airspeed indications were presented to the flight crew. Five years later, a Boeing 777, Malaysian Airlines flight 370, simply disappeared, prompting an extensive, fruitless search, with little factual information ever emerging as to the cause.
ICAO responded to these two tragedies with a new standard for aircraft tracking and distress alerting, known as the Global Aeronautical Distress and Safety System (GADSS).…
