Date: 201903
Local time of day: 0601-1200
Location: JNX.Airport, NC
Flight conditions: VMC
Weather elements / visibility: 10
Light: Daylight
Aircraft: Diamond Aircraft Undifferentiated or Other Model
Operator: Other Flight School
Operating under: Part 91
Flight plan: VFR
Mission: Training
Flight phase: Takeoff / Launch
Airspace: Class E JNX
ATC / advisory: CTAF JNX
Second aircraft: Cessna Aircraft Undifferentiated or Other Model
Reporter organization: Personal
Reporter function: Instructor; Pilot Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Commercial
Human factors: Communication Breakdown; Troubleshooting; Situational Awareness; Confusion
Anomaly: Conflict Ground Conflict; Critical
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Took Evasive Action
Contributing factors: Procedure; Human Factors; Airport
Primary problem: Human Factors

Narrative: I was flying with my student from to JNX for flight training. My student had the flight controls; and I was PIC. We made 2 inbound traffic position reports on 122.725; the current CTAF frequency for JNX. There was also 2 other aircraft in the pattern talking on the radio; all of us landing and departing Runway 03. My student and I entered the left downwind for Runway 03 and followed Aircraft Z that was on a 5 mile final for Runway 03. We made base and final callouts behind Aircraft Z. Aircraft Z executed a go-around; as did my student and myself. We remained left closed pattern; and followed the Aircraft Z for a second approach; making traffic pattern callouts the entire pattern. Aircraft Z landed on [Runway] 03; and started taxiing back on Taxiway A; and we performed a full stop landing on the runway shortly thereafter; planning to perform an intersection takeoff from Taxiway F (a stop-and-go). As we started to accelerate for take-off; about 5 seconds later; I noticed a plane on short final for Runway 21 directly in front of us. I pointed the plane out to my student; took flight controls; and started to slow us down moved to the right edge of Runway 03 near the grass. I also made a very loud; deliberate call-out on the radio for the aircraft landing on Runway 21 to execute a go-around immediately as we were still on the runway. I noticed the opposing plane (Aircraft X) was not responding and was continuing their landing; so I pulled our plane over partly on the grass to avoid them. The Cessna; [Aircraft X]; saw us once they were on the runway; and immediately locked their brakes and skidded down the runway while staying to the opposite side of the runway from us. They continued skidding past us until they came to a stop behind us a ways down the runway; and exited behind us onto the taxiway. Both aircraft stopped on the ramp; and we approached the other pilot to see if he was OK and to ask what happened. He claimed to be making all his pattern callouts on 122.8; the old CTAF frequency; and was landing Runway 21 because the winds were favoring Runway 21 (winds had been variable all day; switching favorable runways considerably). I informed him that the frequency recently changed; and he took responsibility for not knowing and was very apologetic.




Synopsis: General aviation pilot reported a near miss with an opposite direction aircraft when attempting to take off.