PA44 departing dvt has near midair collision with arrival PA28.

Attributes
ACN	581481
Time
Date	200305
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dvt.airport
State Reference	AZ
Altitude	msl single value : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : dvt.tower
Operator	general aviation : instructional
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Aircraft 2
Controlling Facilities	tower : dvt.tower
Operator	general aviation : instructional
Make Model Name	PA-44 Seminole Turbo Seminole
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff climbout : initial
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller military : 4 controller non radar : 8 controller radar : 14 controller supervisory : 1 controller time certified in position1 : 4
ASRS Report	581481
Person 2
Affiliation	other
Function	instruction : instructor oversight : pic
Events
Anomaly	conflict : nmac non adherence : clearance other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued advisory flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 0 vertical : 50
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Intra Facility Coordination Failure

Narrative:

Working local control north with 3 aircraft inbound from the northwest, all VFR. Local control south coordination a northwest departure on a PA44, VFR. When I approved the northwest turn on the PA44, all of my aircraft inbound from the northwest were abeam the PA44 and at 2500 ft. The seminole was leaving 2600 ft before he turned. Shortly thereafter, I saw the PA44's target (on the d-brite) nebound, with a mode C of 2400. I asked the PA44 to say altitude leaving, and he said 2500 ft. I looked out the window to see if he was in conflict with any inbounds. I found him just as he dove to miss one of the inbound PA28's. After some discussion with both pilots, the PA44 said that he pulled an engine on his student as he turned nwbound causing the aircraft to turn northeast and descend. A great deal of flight training happens here at dvt. While I understand the need to practice a variety of skills, the instructor would have been better off practicing that particular skill outside of the class D airspace.

Original NASA ASRS Text

Title: PA44 DEPARTING DVT HAS NMAC WITH ARR PA28.

Narrative: WORKING LCL CTL N WITH 3 ACFT INBOUND FROM THE NW, ALL VFR. LCL CTL S COORD A NW DEP ON A PA44, VFR. WHEN I APPROVED THE NW TURN ON THE PA44, ALL OF MY ACFT INBOUND FROM THE NW WERE ABEAM THE PA44 AND AT 2500 FT. THE SEMINOLE WAS LEAVING 2600 FT BEFORE HE TURNED. SHORTLY THEREAFTER, I SAW THE PA44'S TARGET (ON THE D-BRITE) NEBOUND, WITH A MODE C OF 2400. I ASKED THE PA44 TO SAY ALT LEAVING, AND HE SAID 2500 FT. I LOOKED OUT THE WINDOW TO SEE IF HE WAS IN CONFLICT WITH ANY INBOUNDS. I FOUND HIM JUST AS HE DOVE TO MISS ONE OF THE INBOUND PA28'S. AFTER SOME DISCUSSION WITH BOTH PLTS, THE PA44 SAID THAT HE PULLED AN ENG ON HIS STUDENT AS HE TURNED NWBOUND CAUSING THE ACFT TO TURN NE AND DSND. A GREAT DEAL OF FLT TRAINING HAPPENS HERE AT DVT. WHILE I UNDERSTAND THE NEED TO PRACTICE A VARIETY OF SKILLS, THE INSTRUCTOR WOULD HAVE BEEN BETTER OFF PRACTICING THAT PARTICULAR SKILL OUTSIDE OF THE CLASS D AIRSPACE.

Data retrieved from NASA's ASRS site as of July 2007 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.