The FCOM: 3.03.06 P2 states the following:
CVR Test .................................... Press And Maintain
An audio test signal and beep every 4 seconds should be heard through the loudspeakers. Once this is done, talk through the handmike, ensure your voice is head on the loudspeakers and only then release the CVR test pushbutton.
Could someone expand on the very first section, "
An audio test signal and beep..." - can anyone provide a description (or recording!) of this vague "audio test signal"?
Thanks, GY