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Why do some pilots set transponder code 2000 (usually after landing) in some aircrafts like Boeing 737? Any ideas?
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It is an innocuous code that will not affect anyone if inadvertently activated.
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In many ICAO Regions A2000 is used for aircraft which have not been assigned a transponder code. As Intruder says, it's a 'safe' code to leave set.
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It is what you do to avoid the next take-off transmitting the last flight's code (that has not been re-set).
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It's nothing to do with aircraft type but everything to do with the country. It is a notified ICAO difference in the UK for example.
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In UK, it is a requirement of the AIP under ENR 1.6.2 - SSR OPERATING PROCEDURES, para. 2.1 (e), which reads:
2.1 Some Mode A codes are reserved internationally for special purposes and should be selected as follows: (e) Code 2000. When entering United Kingdom airspace from an adjacent region where the operation of transponders has not been required; or by Mode S transponder equipped aircraft on the aerodrome surface when under tow, or parked and prior to selecting OFF or STDBY - unless otherwise instructed by ATC. JD :) |
In Ausi it's 3000.
Like has been said, if you forget to load your assigned code, it will already be transmitting the code for a/c who haven't been assigned a code :) |
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