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Mode S

Old 9th Jun 2016, 00:30
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Mode S

Hi,

why do you still have transponders on Boeing aircrafts where you can enter a 4-number code for Mode A (and C)? Isn't mode S the only mode used nowadays on commercial flights?

Also, how would a mode s tranponder work? Just switch it to standy before take-off, and then to "on" (just like with the A/C modes), but without doing/entering anything else? (since the ICAO 24 bit hex code would always be the same for a specific aircraft..)
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Old 9th Jun 2016, 15:27
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I suspect that as you didn't bother to acknowledge any of the replies to the previous two questions you asked, there might not be any forthcoming this time ...
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Old 9th Jun 2016, 18:29
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if i correctly remember, mode s in not available everywhere. so if you make a flight from europe to asia, there might be some areas where you will have to enter your A/C code. it is basically a back up.
Greetings
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Old 10th Jun 2016, 07:04
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You have to enter the flight number/reg.
One airline in Scotland quite often give us seasonal greetings on mode S but in the low level sectors at Scottish the A/C code is used to correlate the callsign so we see the correct trip number
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Old 10th Jun 2016, 10:06
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MSSR mode A+C only here

Never had an aircraft not able to change their mode A......
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Old 13th Jun 2016, 13:35
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Originally Posted by DaveReidUK
I suspect that as you didn't bother to acknowledge any of the replies to the previous two questions you asked
Nor, predictably, to this one ...

QED.
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