Malaysia Airlines Flight 370 had four beacons , or emergency locator transmitters . One was designed to activate on impact , but satellites did not receive a distress signal . The other two were activated by the pilots when they lost contact with air traffic control and then later regained it after being picked up again from somewhere else in the ocean.
Malaysia Airlines Flight 370 had four beacons , or emergency locator transmitters . One was designed to activate on impact , but satellites did not receive a distress signal . The lack of a distress signal boosts hopes of passengers ' families .