During installation, an airspeed "threshold" for your specific make and model of aircraft is set into the AAS hardware. This value is the manufacturer's recommended final approach (Vref) speed, plus 10-15 mph/kts. This value is adjustable, up and down, in 5 mph/kt increments. Once airborne, the Audio Advisory System continuously monitors the airspeed of the plane and compares it to the actual position of the landing gear. Once the plane slows down to the set airspeed threshold, the system will inform the pilot whether the "GEAR IS DOWN FOR LANDING (male)" or to "CHECK GEAR! (female)".

The AAS also maintains a watch over any excessive airspeed and will annunciate "OVERSPEED! (female)" anytime the speed of the aircraft reaches Vne (red line). This is a handy feature especially when flying in IFR conditions and/or at night.

The model 6601 also has a stall warning feature as well. The system is basically a repeater as it takes the signal from your aircraft stall warning horn and translates it into a distinctive tone that can be heard through your audio system (headset and/or speaker). This feature is especially handy for pilots who wear the new noise-reduction (ANR) type headsets and for those aircraft that have "wimpy" stall warning horns.

In addition, the system provides an output for an optional airspeed activated hour (Hobbs) meter to keep track of actual flight time, not tach time. The AAS will not allow the hour meter to run unless the speed of the aircraft is above 50 mph. This translates into saving you money. Overhauls can be done based on "time-in-service", instead of tach time. Depending on how much taxiing time you accumulate, this feature alone can pay for the system in a very short period.