Readback an "instruction" from an AIS?
Questions arising from a conversation with our tower personnel...
a) If a towered airport operating nothing more than an Aerodrome Information Service were to say to a joining aircraft ,"Report Downwind", does the "instruction" have to be read back, or does "Wilco" suffice?
b) Does the "instruction" have to be complied with at all?
Regards,
LD Max