Near midair collision, 2 smas in the traffic pattern.

Attributes
ACN	318972
Time
Date	199510
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : agc
State Reference	PA
Altitude	msl bound lower : 1900 msl bound upper : 1900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : agc
Operator	general aviation : instructional
Make Model Name	Duchess 76
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent : approach
Flight Plan	None
Aircraft 2
Make Model Name	Cessna 152
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent : approach
Person 1
Affiliation	Other
Function	flight crew : single pilot instruction : instructor
Qualification	pilot : commercial pilot : instrument pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 700 flight time type : 50
ASRS Report	318972
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Events
Anomaly	conflict : nmac
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance other
Consequence	Other
Miss Distance	horizontal : 400 vertical : 50
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

Aircraft also in the pattern was told to extend downwind behind the dutchess (us). We were on a 1 mi final when the C152 turned base, headed right for us. We descended to avoid and controller told C152 to continue left turn 360 degrees and reestablish the downwind to base turn.

Original NASA ASRS Text

Title: NMAC, 2 SMAS IN THE TFC PATTERN.

Narrative: ACFT ALSO IN THE PATTERN WAS TOLD TO EXTEND DOWNWIND BEHIND THE DUTCHESS (US). WE WERE ON A 1 MI FINAL WHEN THE C152 TURNED BASE, HEADED RIGHT FOR US. WE DSNDED TO AVOID AND CTLR TOLD C152 TO CONTINUE L TURN 360 DEGS AND REESTABLISH THE DOWNWIND TO BASE TURN.

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.