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Old 21st Mar 2013, 08:05
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Capt Claret

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Join Date: Feb 2000
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From JeppView, State Rules & Procedures - Australia, p 939.

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 infor-mation and possible misidentification of aircraft in automated Australian ATC systems due to tem-porary selection (while effecting the change) of a code already in use.
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