Small aircraft (X) a cessna was instructed to enter left downwind for runway 8L. Small aircraft (Y), also a cessna, was on a 1/2 NM final when the ATCT local controller observed small aircraft (X) had turned base and was only 150 ft above small aircraft (Y). The controller turned small aircraft (X) to the left away from small aircraft (Y). Near midair collision had already occurred.

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Attributes
ACN	360210
Time
Date	199702
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : phx
State Reference	AZ
Altitude	agl bound lower : 500 agl bound upper : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : phx
Operator	general aviation : personal
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : approach other
Flight Plan	VFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller radar : 15
ASRS Report	360210
Person 2
Affiliation	Other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : clearance non adherence : far
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Aircraft #1 was instructed to enter left downwind runway 8L. Aircraft #2 was on visual approach to runway 8L and on 1/2 mi final when aircraft #1 turned base unauthorized and ended up on top of aircraft #2. Aircraft #1 was told to make a hard left turn away from final.

Original NASA ASRS Text

Title: SMA (X) A CESSNA WAS INSTRUCTED TO ENTER L DOWNWIND FOR RWY 8L. SMA (Y), ALSO A CESSNA, WAS ON A 1/2 NM FINAL WHEN THE ATCT LCL CTLR OBSERVED SMA (X) HAD TURNED BASE AND WAS ONLY 150 FT ABOVE SMA (Y). THE CTLR TURNED SMA (X) TO THE L AWAY FROM SMA (Y). NMAC HAD ALREADY OCCURRED.

Narrative: ACFT #1 WAS INSTRUCTED TO ENTER L DOWNWIND RWY 8L. ACFT #2 WAS ON VISUAL APCH TO RWY 8L AND ON 1/2 MI FINAL WHEN ACFT #1 TURNED BASE UNAUTH AND ENDED UP ON TOP OF ACFT #2. ACFT #1 WAS TOLD TO MAKE A HARD L TURN AWAY FROM FINAL.

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.