Posted by MarkB_MI on March 22, 2014 at 11:13:18 from (75.198.69.41):
In Reply to: OT Flight 307 again posted by pat sublett on March 22, 2014 at 09:50:11:
You can be fairly certain there are redundant transponders on a 777, operated from redundant, independent electrical systems. Also, transponders are very simple, reliable devices as modern avionics go; they just don't fail that often.
Now, of course if a transponder does fail, it's difficult to tell from the cockpit. But the telling point is that the transponder quit at precisely the moment went it was least likely to be noticed. When the flight was handed off from Malaysian to Vietnamese ATC, it would have been typical for the new control center to instruct the aircraft to switch to a different transponder code. If Malayasian ATC didn't have the squawk code turned on on their radar displays, the flight would have seemed to disappear, just like it did. And it seems the Vietnamese controllers weren't paying attention, otherwise they would have noticed almost immediately that a flight which should have reported in to them did not.
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