PA28-181 on training flight was cleared to land runway 6. On base leg noted C172 on quartering entry to base leg. Advised tower making an evasive 360 degree turn to the left and landed behind the C172. Aircraft was supposed to advise on final but entered traffic on the modified base leg.

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Attributes
ACN	353337
Time
Date	199611
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : bdr
State Reference	CT
Altitude	msl bound lower : 800 msl bound upper : 800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bdr
Operator	general aviation : instructional
Make Model Name	PA-28 Cherokee Arrow IV
Operating Under FAR Part	Part 91
Flight Phase	descent : approach other
Route In Use	approach : visual
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	descent : approach other
Route In Use	approach : visual
Person 1
Affiliation	Other
Function	flight crew : single pilot instruction : instructor
Qualification	pilot : cfi pilot : instrument
Experience	flight time type : 100
ASRS Report	353337
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : clearance non adherence : far
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 600 vertical : 800
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Between XA00 and XA30, while instructing a private pilot on lndgs in a piper PA28-181, the tower cleared us to land from a left downwind leg for runway 6. After turning base leg and beginning a descent, I observed an aircraft (C172?) approaching on a converging course of about 30 degrees from the right to the base leg at my altitude at a distance of about 200 yards. I immediately informed the tower that I would take evasive action and executed a 360 degree turn to the left to re- establish on the base leg. After re-establishing, I asked the tower if the converging aircraft had been cleared to land ahead of us. As I recall the tower advised that the converging aircraft had been told to report on final but instead had entered the base leg on the converging track and landed ahead of us. The tower added a comment to the effect that the converging aircraft was flown by one of our better pilots.

Original NASA ASRS Text

Title: PA28-181 ON TRAINING FLT WAS CLRED TO LAND RWY 6. ON BASE LEG NOTED C172 ON QUARTERING ENTRY TO BASE LEG. ADVISED TWR MAKING AN EVASIVE 360 DEG TURN TO THE L AND LANDED BEHIND THE C172. ACFT WAS SUPPOSED TO ADVISE ON FINAL BUT ENTERED TFC ON THE MODIFIED BASE LEG.

Narrative: BTWN XA00 AND XA30, WHILE INSTRUCTING A PVT PLT ON LNDGS IN A PIPER PA28-181, THE TWR CLRED US TO LAND FROM A L DOWNWIND LEG FOR RWY 6. AFTER TURNING BASE LEG AND BEGINNING A DSCNT, I OBSERVED AN ACFT (C172?) APCHING ON A CONVERGING COURSE OF ABOUT 30 DEGS FROM THE R TO THE BASE LEG AT MY ALT AT A DISTANCE OF ABOUT 200 YARDS. I IMMEDIATELY INFORMED THE TWR THAT I WOULD TAKE EVASIVE ACTION AND EXECUTED A 360 DEG TURN TO THE L TO RE- ESTABLISH ON THE BASE LEG. AFTER RE-ESTABLISHING, I ASKED THE TWR IF THE CONVERGING ACFT HAD BEEN CLRED TO LAND AHEAD OF US. AS I RECALL THE TWR ADVISED THAT THE CONVERGING ACFT HAD BEEN TOLD TO RPT ON FINAL BUT INSTEAD HAD ENTERED THE BASE LEG ON THE CONVERGING TRACK AND LANDED AHEAD OF US. THE TWR ADDED A COMMENT TO THE EFFECT THAT THE CONVERGING ACFT WAS FLOWN BY ONE OF OUR BETTER PLTS.

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.