A pilot reported a near midair collision with an aircraft from a flight school whose aircraft are no...

Narrative:

I am currently flying out of an airport which is very busy with flight school traffic. My last flight departed with a turn to the north west under the class B shelf. Traffic in the area was busy as it normally is but I was somewhat comfortable with knowing that most all the traffic could be visually spotted with the assistance of my adsb in. I was passing about 1500 feet below and between two slower aircraft headed in my general direction with a good visual on both. When I was about a mile from the aircraft on my left he made an abrupt 270 degree descending turn directly towards me causing a rapid closure rate. Fortunately we missed but it was way to close of a call for my comfort. I am not sure he ever saw me given he was descending and I was below him. I did get his north number from my adsb in data and looked it up to see it belonged to one of the flight schools here. I called the school and talked to the head flight instructor. I was curious why this student did not do a clearing turn and why he did not see me on his adsb in. I was surprised at his response that 'not all our aircraft have adsb in'. I said as inexpensive as these systems are it would make sense for training aircraft doing maneuvers under the class B shelf to have these. It was only a couple of years ago that they had two training aircraft collide just north of this airport. My phone call may or may not have had any beneficial effect. Any thoughts or advice?

Original NASA ASRS Text

Title: A Pilot reported a NMAC with an aircraft from a flight school whose aircraft are not equipped with ADSB.

Narrative: I am currently flying out of an airport which is very busy with flight school traffic. My last flight departed with a turn to the North West under the Class B shelf. Traffic in the area was busy as it normally is but I was somewhat comfortable with knowing that most all the traffic could be visually spotted with the assistance of my ADSB in. I was passing about 1500 feet below and between two slower aircraft headed in my general direction with a good visual on both. When I was about a mile from the aircraft on my left he made an abrupt 270 degree descending turn directly towards me causing a rapid closure rate. Fortunately we missed but it was way to close of a call for my comfort. I am not sure he ever saw me given he was descending and I was below him. I did get his N number from my ADSB in data and looked it up to see it belonged to one of the flight schools here. I called the school and talked to the head flight instructor. I was curious why this student did not do a clearing turn and why he did not see me on his ADSB in. I was surprised at his response that 'not all our aircraft have ADSB in'. I said as inexpensive as these systems are it would make sense for training aircraft doing maneuvers under the Class B shelf to have these. It was only a couple of years ago that they had two training aircraft collide just north of this airport. My phone call may or may not have had any beneficial effect. Any thoughts or advice?

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1742781
Time
Date	202004
Local Time Of Day	0601-1200
Place
Locale Reference	P50.TRACON
State Reference	AZ
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	M-20 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Initial Climb
Route In Use	None
Flight Plan	VFR
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument
Experience	Flight Crew Last 90 Days 7 Flight Crew Total 2000 Flight Crew Type 1900
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 0.25 Vertical 200

A pilot reported a near midair collision with an aircraft from a flight school whose aircraft are not equipped with adsb.