Small Aircraft
Flight Crew Multiengine; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 10; Flight Crew Total 3200; Flight Crew Type 15
Other / Unknown; Training / Qualification
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Ground Incursion Runway
General None Reported / Taken
Human Factors
On approach to and in entering the pattern for ZZZ; the wrong frequency was entered for the CTAF after listening to the AWOS. The numbers were input in the wrong order. Although the airport was familiar to myself and the private pilot I missed it while looking for traffic upon the 45 for entering the downwind. It became apparent that there was a radio issue as we started to turn base to final and another aircraft took the runway for takeoff. There was no conflict; but we then turned off of the runway and stopped to check the headset connections and checked the frequency. It was clear that the frequency was incorrect. Frequency was changed and we continued with the flight training. Perhaps the biggest issue was the lack of frequent flying of the due to the stay at home request in dealing with COVID-19. I missed the incorrect frequency because of the difficulty in seeing the entire frequency from the right seat and while looking for traffic. The issue could have been avoided by double checking the frequency and moving to a position in the cockpit to clearly see the frequency on the pilot's side of the display.
Instructor pilot reported dialing the incorrect CTAF frequency and landed while an aircraft was lining up to takeoff on the same runway.