PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Flight Instructor
Flight Crew Last 90 Days 62; Flight Crew Total 480; Flight Crew Type 62
Confusion; Distraction; Communication Breakdown
ATC Issue All Types; Conflict NMAC
Procedure; Human Factors; Chart Or Publication; ATC Equipment / Nav Facility / Buildings
I was an instructor on a dual flight out of DVT. My student was cleared to land on Runway 25L. After turning final approximately 3 miles from the runway the Controller issued him an instruction to sidestep to Runway 25R and contact Tower at 118.4. After completing the maneuver we contacted the Controller in charge of the north runway. She screamed at us that we were supposed to be on the other frequency and to return to 120.2. At that moment a Cessna appeared VERY close on our right side and we initiated a go-around.I would like to report the incident as there were a lot of mistakes done that morning. We had to make 3 attempts to contact Tower before entering Class D airspace and had to complete a 360 before radio contact was established. Many instructions and subsequent corrections were issued usually consisting of correcting the aircraft call sign to which the instruction was issued.DVT is an extremely busy airport with a huge amount of training activity; and it should be attended by experienced controllers. I would like to raise some awareness about the situation at this location; there are many instructors with similar experiences. If there is anything I could do to improve the safety of flying at this airport please let me know.
When the student and instructor pilots of a PA-28 complied with a clearance to switch their approach from Runway 25L to 25R at DVT they experienced an NMAC with a Cessna already inbound to the right runway as well as an excited admonition from the 25R Controller to return to 25L and their previous Controller.