Tower controller witnessed a pilot declared near midair collision when traffic on a right and left d...

Attributes
ACN	1108690
Time
Date	201308
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Duchess 76
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	None
Flight Plan	VFR
Aircraft 2
Make Model Name	Skylane 182/RG Turbo Skylane/RG
Operating Under FAR Part	Part 91
Flight Phase	Landing
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Conflict NMAC

Narrative:

Training was in progress on LC1; aircraft X was in the VFR pattern on right down wind and cleared touch and go following a cessna on final; aircraft Y was VFR on left downwind and sequenced to follow aircraft X. Aircraft Y reported BE76 in sight and cleared to land following aircraft X. The controller then saw aircraft Y and aircraft X in close proximity to each other and issued a left three sixty to aircraft Y. Aircraft X ask the controller if he should go around and said 'that was a near miss.' the developmental controller being trained was behind on his traffic and not keeping up; as the controller in charge I should have told his trainer he should think about taking over the position.

Original NASA ASRS Text

Title: Tower Controller witnessed a pilot declared NMAC when traffic on a right and left downwind conflicted turning base to follow traffic on final; the reporter indicated the instructor should have taken Local sooner.

Narrative: Training was in progress on LC1; Aircraft X was in the VFR pattern on right down wind and cleared touch and go following a Cessna on final; Aircraft Y was VFR on left downwind and sequenced to follow Aircraft X. Aircraft Y reported BE76 in sight and cleared to land following Aircraft X. The Controller then saw Aircraft Y and Aircraft X in close proximity to each other and issued a left three sixty to Aircraft Y. Aircraft X ask the Controller if he should go around and said 'that was a near miss.' The developmental Controller being trained was behind on his traffic and not keeping up; as the CIC I should have told his trainer he should think about taking over the position.

Data retrieved from NASA's ASRS site as of July 2013 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.

Tower controller witnessed a pilot declared near midair collision when traffic on a right and left downwind conflicted turning base to follow traffic on final; the reporter indicated the instructor should have taken local sooner.