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Old 29th Mar 2013, 16:23
  #43 (permalink)  
Join Date: Mar 2011
Location: engineer at large
Posts: 1,409
From Transport Canada


"Do not select “STANDBY” while changing codes as this will cause the target to be lost on the ATC radar screen.

Pilots should adjust transponders to “STANDBY” while taxiing for takeoff, to “ON” (or “NORMAL”) as late as practicable before takeoff, and to “STANDBY” or “OFF” as soon as practicable after landing. In practice, transponders should be turned on only upon entering the active runway for departure and turned off as soon as the aircraft exits the runway after landing."
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