Division (d) The CVR shall record with reference to a timescale:F1

voice communications transmitted from or received in the flight crew compartment by radio;

flight crew members' voice communications using the interphone system and the public address system, if installed;

the aural environment of the flight crew compartment, including without interruption:

1. (i)

   for helicopters first issued with an individual CofA on or after 1 August 1999 , the audio signals received from each crew microphone;

2. (ii)

   for helicopters first issued with an individual CofA before 1 August 1999 , the audio signals received from each crew microphone, where practicable;

voice or audio signals identifying navigation or approach aids introduced into a headset or speaker.