Skyhawk 172/Cutlass 172
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor
Flight Crew Last 90 Days 250; Flight Crew Total 1500; Flight Crew Type 1300
Communication Breakdown; Situational Awareness
Aircraft Equipment Problem Less Severe; Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft
While doing commercial training with a student; we went to a non-towered field (ZZZ) to do emergency procedures. We were practicing engine failures after takeoff and doing a turn back to the runway in the case of an engine failure after takeoff. We were landing on Runway XX-XY. We were making radio calls 10 miles out; 5 miles out; on final and after departure. In each transmission we stated our intentions. After departing Runway XX; we saw another aircraft which had just landed on [Runway] XZ. They were coming to a stop prior to the crossing runway and we were already airborne about 500 ft AGL. We had never heard any transmissions from the other aircraft. We decided to use our second radio and we then heard their transmissions. We discovered that our other radio had gone inoperative.
C172 flight instructor reported that during on takeoff another aircraft landed on crossing runway resulted in a ground conflict. Instructor determined their radio had failed.