787 SYS 1 Communications

Question 1

For HF:
-When does final tuning occur
-what indicates antenna is tuning
-time that indicates tuning failure

Answer 1

-transmitter is keyed
-continuous or intermittent tone may or may not be heard
-7 seconds

Question 2

How is a priority call to door 1L done

Answer 2

Push ACP CAB switch twice in 1 sec