SINGAPORE: New evidence has suggested that the transponder on missing Malaysia Airlines MH370 might have been shut down deliberately. Here are 5 things you need to know about transponders.
1. What information does a transponder send, and who does it send it to?
A transponder is a radio transmitter in the cockpit that works with ground radar. When the transponder receives a signal from a more sophisticated ground "secondary" radar, it returns a squawk code with the aircraft's position, its altitude and its call sign. It is constantly being radar pinged, helping air traffic controllers on the ground determine the airplane's speed and direction, too.
2. What does "squawk" mean?
It's a four-digit identifying code that the pilot enters into a transponder for each flight. It helps air traffic control recognise each plane.
3. Why are transponders necessary?
Primary radar is more basic, effective only at seeing the radar reflection of objects. It paints targets, displaying them with a blip on a screen. The bigger the object, the bigger the reflection. Transponders enhance the reflected signal and provide the additional information for air traffic control.
4. Is there a way to use it to indicate a problem on board the aircraft?
There are codes for different emergencies. For a hijacking, it's 7500. For communications failure, 7600. Emergencies are 7700.
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MH370 , MAS , transponder
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