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Old 20th Mar 2013, 23:50
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737aviator

some airports like Stansted say in the jepp brief to set it to 2000 before selecting Standby. From flying school though you got your hand chopped off by an instructor if you tried to change the code before selecting Standby first though.
Can I just point out what the UK AIP, ENR 1.6.2.2.1 (e) tell us:

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.
I believe it's something to do with automatically logging-off the Mode S system. Any ATC people here to explain?
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