Narrative:

My private pilot student and I had departed going down to have some avionics inspections performed on his aircraft. After the inspections were completed; we had radio problems with our single radio and were able to have the avionics tech install an identical radio which seemed to fix the problem; with one note that the new radio had a slight problem with a scratchy volume knob. We departed the same day and were able to pick up clearance from approach for transition of their airspace from south to north. During the whole duration of our flight with approach; we were barely able to understand their transmissions; but we were able to hear enough to comply with their requests until we identified our destination airport. Once we were turned over to the CTAF and squawked 1200; I reached across my private pilot student to tune in the CTAF frequency. I tuned in the frequency for our previous airport on 122.8 instead of 123.0. We entered the pattern for left traffic (should have been right traffic as noted on the sectional and in the AFD) on runway 23 for the prevailing winds as monitored from ATIS of 260 at 3 KTS. We made our normal radio calls for all legs of the pattern and never saw the C152 in the left pattern for runway 5. Once we landed; we observed the aircraft on the runway at the opposite end approximately 1;500 ft down the runway from us. Both aircraft initiated maneuvers to brake; slow down; and avoid to the right and were at taxi speed by the time we passed one another to the left. The C152 did go into the grass to taxi around our aircraft. Both aircraft taxied back in and shut down just off the runway to talk with another instructor at the field. After discussing the pattern entry and CTAF frequency; we went ahead and tested my student's aircraft radio on the proper frequency to check for operation. That is when we also noticed that the radio in our aircraft was inoperative on multiple frequencies (123.00; 122.80; 125.10; 123.45). There was no damage noted to either aircraft and we never came closer than 100 ft at normal taxi speeds to one another. Contributing factors: I have used this airport on prior occasions with no problems but had not landed on this runway in many years. This was only our second landing at this airport since moving my student's aircraft here at the beginning of july. I had used the 123.0 frequency on our previous flight and used left traffic for runway 5. I had done a study of the airport and missed the note for right traffic on runway 23. The biggest contributing factor was when I put in the prior airport's CTAF frequency of 122.8 and the fact that our radio was inoperative; in order that we could talk with other traffic in the pattern. Corrective actions: I have taken it upon myself to make an airport briefing card for every flight that I do; with or without a student and will pass this along to the students as well. This will ensure we are well informed of all factors for our airports of intended use and we don't have to dig in the AFD in flight if we have a question in regards to safety related airport information. I will be taking some training with another instructor to familiarize myself with the local training procedures for this airport. I am signing up for additional safety/faast courses online with the FAA and a national pilot organization.

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Original NASA ASRS Text

Title: An Instructor reported a ground conflict with opposite direction landing traffic at an unfamiliar CTAF airport after he made his radio calls on a defective radio tuned to the incorrect CTAF frequency.

Narrative: My private pilot student and I had departed going down to have some avionics inspections performed on his aircraft. After the inspections were completed; we had radio problems with our single radio and were able to have the Avionics Tech install an identical radio which seemed to fix the problem; with one note that the new radio had a slight problem with a scratchy volume knob. We departed the same day and were able to pick up clearance from Approach for transition of their airspace from south to north. During the whole duration of our flight with Approach; we were barely able to understand their transmissions; but we were able to hear enough to comply with their requests until we identified our destination airport. Once we were turned over to the CTAF and squawked 1200; I reached across my private pilot student to tune in the CTAF frequency. I tuned in the frequency for our previous airport on 122.8 instead of 123.0. We entered the pattern for left traffic (should have been right traffic as noted on the sectional and in the AFD) on Runway 23 for the prevailing winds as monitored from ATIS of 260 at 3 KTS. We made our normal radio calls for all legs of the pattern and never saw the C152 in the left pattern for Runway 5. Once we landed; we observed the aircraft on the runway at the opposite end approximately 1;500 FT down the runway from us. Both aircraft initiated maneuvers to brake; slow down; and avoid to the right and were at taxi speed by the time we passed one another to the left. The C152 did go into the grass to taxi around our aircraft. Both aircraft taxied back in and shut down just off the runway to talk with another instructor at the field. After discussing the pattern entry and CTAF frequency; we went ahead and tested my student's aircraft radio on the proper frequency to check for operation. That is when we also noticed that the radio in our aircraft was inoperative on multiple frequencies (123.00; 122.80; 125.10; 123.45). There was no damage noted to either aircraft and we never came closer than 100 FT at normal taxi speeds to one another. Contributing Factors: I have used this airport on prior occasions with no problems but had not landed on this runway in many years. This was only our second landing at this airport since moving my student's aircraft here at the beginning of July. I had used the 123.0 frequency on our previous flight and used left traffic for Runway 5. I had done a study of the airport and missed the note for right traffic on Runway 23. The biggest contributing factor was when I put in the prior airport's CTAF frequency of 122.8 and the fact that our radio was inoperative; in order that we could talk with other traffic in the pattern. Corrective Actions: I have taken it upon myself to make an airport briefing card for every flight that I do; with or without a student and will pass this along to the students as well. This will ensure we are well informed of all factors for our airports of intended use and we don't have to dig in the AFD in flight if we have a question in regards to safety related airport information. I will be taking some training with another instructor to familiarize myself with the local training procedures for this airport. I am signing up for additional safety/FAAST courses online with the FAA and a national pilot organization.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.