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FAA warns of Embraer jet transponder issue
11 July 2007

The FAA issued a Safety Alert for Operators calling attention to the possibility that a pilot of an Embraer Legacy, EMB-135 or -145 might inadvertently change VHF radio frequencies or place the ATC transponder into standby mode during flight.
During an investigation the FAA discovered that crewmembers who had the simple habit of placing their shoe on the footrest just below the instrument panel could inadvertently put the ATC transponder into standby mode, or change radio frequencies without the crew’s awareness. Further, they found that pilots might not notice the corresponding indication on the Pilot Flight Display due to the white colored letters, which are not as noticeable as differently colored caution or warning indications. (FAA)