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If you experience an emergency after having already established radio contract with an ATSU, then what are your actions?

  • A

    Make a distress call on the frequency and set the transponder code of 7500.

  • B

    Make a distress call on 121.5 MHz and maintain your assigned transponder code.

  • C

    Make a distress call on the frequency and maintain your assigned transponder code.

  • D

    Make an urgency call on the frequency and maintain your assigned transponder code.

Looking at the answer options:

Make a distress call on the frequency and set the transponder code of 7500 → INCORRECT. 7500 is for unlawful interference, you should instead maintain your assigned code unless instructed by ATC to change it. 

Make a distress call on 121.5 MHz and maintain your assigned transponder code → INCORRECT. The distress call should be made on the frequency in use ideally although 121.5 is a back up option.

Make a distress call on the frequency and maintain your assigned transponder code → CORRECT. When already in contact with an Air Traffic Service (ATS) unit, you should use the frequency already in use. You are not required to switch to 121.5 MHz unless you are unable to establish contact on your current frequency. If you are already squawking an assigned discrete code and in communication with ATC, you should maintain that code unless specifically instructed by the controller to change it.

Make an urgency call on the frequency and maintain your assigned transponder code → INCORRECT. The question scenario is an emergency so an urgency call is incorrect.

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