Currently, the switch only works if set in the "OUTBOUND" position, and searches for another nearby NDB to switch to.
How it should work AFAIK:
If switch is set to outbound, and the channel is odd and not 9, and the gear is down: upon flying over the outer NDB marker with some degree of accuracy, the radio automatically switches to the channel indicated on the ARC dial (2,4,6 or 8) - the roman numeral I is for tuning slow (8 secs), and the II is for tuning fast (4 sec).
If switch is set to inbound, and the gear is down: the ADF is tuned to what is indicated on the knob.
Currently, the switch only works if set in the "OUTBOUND" position, and searches for another nearby NDB to switch to.
How it should work AFAIK: If switch is set to outbound, and the channel is odd and not 9, and the gear is down: upon flying over the outer NDB marker with some degree of accuracy, the radio automatically switches to the channel indicated on the ARC dial (2,4,6 or 8) - the roman numeral I is for tuning slow (8 secs), and the II is for tuning fast (4 sec).
If switch is set to inbound, and the gear is down: the ADF is tuned to what is indicated on the knob.