Date: 201212
Local time of day: 1201-1800
Location: PRC.Airport, AZ
Flight conditions: VMC
Weather elements / visibility: 99
Light: Daylight
Aircraft: Small Aircraft; High Wing; 1 Eng; Fixed Gear
Operator: FBO
Operating under: Part 91
Flight plan: None
Mission: Training
Flight phase: Takeoff / Launch
Airspace: Class D PRC
ATC / advisory: Tower PRC
Second aircraft: Small Aircraft; High Wing; 1 Eng; Fixed Gear
Reporter organization: FBO
Reporter function: Pilot Not Flying; Captain; Instructor
Reporter qualification: Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Multiengine; Flight Crew Instrument
Human factors: Situational Awareness; Training / Qualification; Communication Breakdown; Confusion
Anomaly: Conflict NMAC; Deviation / Discrepancy - Procedural Clearance
Detector: Person Flight Crew; Person Air Traffic Control
When detected: In-flight
Result: Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action
Contributing factors: Human Factors; Procedure; Environment - Non Weather Related
Primary problem: Ambiguous

Narrative: I was acting as an instructor on a training flight with my commercial applicant. He is at the end of our 141 training course at an FBO. We were heading eastbound on a simulated cross country. Tower cleared us for takeoff from 21L and told us to keep runway heading. We took off on runway heading. The other aircraft had just taken off prior to us on 21L (more than 1 NM ahead). Tower told them to make left traffic for 21L (they were remaining in the pattern). They were on left crosswind when Tower asked them to make a right 270 degree turn to join the downwind. We were climbing on upwind and Tower told us that our left turn eastbound was approved after 6;500 FT (1;500 FT AGL). Approaching 6;000 FT 1 NM on upwind I saw the other aircraft getting closer to us. I thought that the wind may have been blowing them toward us. That is when I noticed our ADS-B showed them heading directly toward us 100 FT or less above. He made a right 180 turn and headed directly at us. I could not turn right because of the parallel runway. My student froze up and did not know what to do. I grabbed the controls and dove (slipped) very quickly under the opposing aircraft (full right rudder and left bank to maintain runway heading; but lose altitude rapidly). I reported to Tower that we were diving under an aircraft on upwind. Tower ignored me and told the other aircraft to continue in right close traffic. This did not make sense; Tower never cleared them for right traffic. My commercial student and I saw the faces of the pilots in the other plane. If I did not react and dive under the plane; there would have been several fatalities. I suspect that the other instructor did not understand what Tower wanted him to do (I think that English is his second language). I also think that he made a bad decision to turn into another plane; not paying attention to traffic or his ADS-B. He made no evasive maneuver; he would have just run into us. This instructor has made a few really bad decisions. I feel that this instructor needs some re-training with situational awareness and aeronautical decision making and probably a reduction in workload (he has too many students); before something bad happens.




Synopsis: Two VFR aircraft departed PRC Runway 21L one mile apart and had a near miss because ATC cleared the lead aircraft; then in a left turn; to make a spacing turn resulting in that aircraft turning directly into the second aircraft.