Quote:
7.1.10 Pilots must select the transponder to STANDBY before effecting an SSR code change and returning the transponder to ON/ALT.
Note: This action is required to prevent possible loss of displayed aircraft position/label information and possible misidentification of aircraft in automated Australian ATC systems due to temporary selection (while effecting the change) of a code already in use. does anybody know if this applies to any other place apart from Australia
HAROON You are dead right mate, it applies to the UK as well.
Here is another way of looking at it:
ALWAYS GO TO STAND BY BEFORE CHANGING CODE.
JUST DO IT!!