Narrative:

A near collision ensued near the blue ash airport; isz. The problem arose as 2 aircraft were performing practice takeoffs and lndgs; a 3RD was waiting to depart; and a 4TH was inbound for full stop landing. The aircraft waiting to depart cut off the 4TH aircraft which was on short final. Myself and a student were in the 4TH aircraft. The crowded traffic pattern was discovered as we overflew the field 2000 ft AGL and witnessed the first 2 aircraft; both C172's performing practice takeoffs and lndgs in close proximity; less than 1/2 NM apart. #1 completed a touch and go landing and #2 performed a go around; presumably because #1 had not cleared the runway. We continued past the airport to circle around and enter the pattern on a 45 degree angle for the downwind. #1 and #2 both joined the downwind as we continued on a 45 degree angle. We noticed the 2 cessnas on downwind were close to each other; so we slowed airspeed to allow more separation. We heard the citabria holding short enquire a 5TH aircraft that had just departed if they were 'going to get a hotdog.' this transmission stepped on #1's transmission for turn to base. #1 transmitted the turn to final; and the citabria holding short was heard transmitting 'are you guys ever going to let us depart?' #2 turned and reported base leg as we joined downwind and made our position report. As we approached our turn to base; we noted #2 on final was less than 1/2 NM behind #1 who was touching down. We proceeded to turn base to final and saw #1 over the departure end of the runway; #2 over midfield on a go around; and the citabria taking the runway. My student made a call turning final; and the citabria transmitted; 'citabria; we going to depart now; because; yeah.' it seemed the citabria noticed us on short final and chose to depart anyway. My student announced a go around and told the departing citabria that we were on their left. The citabria continued to climb and head slightly left into our flight path; still slightly lower. I took controls from the student and headed right and over the runway to avoid the citabria; which was now about 200 ft left and ahead. The cessnas were turning downwind and crosswind; respectively. As we approached abeam the citabria; it began a climbing turn to the right close to our flight path and announced departing pattern to the north. I quickly descended and held course extending upwind leg. I transmitted 'aircraft departing north; somehow you slipped to our left. We are descending upwind so you will climb over us.' the citabria never confirmed they had us in sight; but instead made a comment about how busy the pattern was. I watched the citabria climb over us through the skylight windows. It was about 100 ft above us. We departed the pattern and reentered after we had cleared the area. I believe the citabria's impatience was a contributing human factor. The only action to prevent a recurrence is to urge pilots not to take chances. Given the radio call the citabria made when departing; I believe the citabria cleared the area and saw our aircraft on final; and decided to depart anyway.

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Original NASA ASRS Text

Title: C172 WAS ON SHORT FINAL INTO UNCONTROLLED ARPT WHEN ANOTHER ACFT TOOK THE RWY AND DEPARTED. GAR WAS EXECUTED AND EVASIVE ACTION TAKEN TO AVOID THE OTHER CLIMBING ACFT.

Narrative: A NEAR COLLISION ENSUED NEAR THE BLUE ASH ARPT; ISZ. THE PROB AROSE AS 2 ACFT WERE PERFORMING PRACTICE TKOFS AND LNDGS; A 3RD WAS WAITING TO DEPART; AND A 4TH WAS INBOUND FOR FULL STOP LNDG. THE ACFT WAITING TO DEPART CUT OFF THE 4TH ACFT WHICH WAS ON SHORT FINAL. MYSELF AND A STUDENT WERE IN THE 4TH ACFT. THE CROWDED TFC PATTERN WAS DISCOVERED AS WE OVERFLEW THE FIELD 2000 FT AGL AND WITNESSED THE FIRST 2 ACFT; BOTH C172'S PERFORMING PRACTICE TKOFS AND LNDGS IN CLOSE PROX; LESS THAN 1/2 NM APART. #1 COMPLETED A TOUCH AND GO LNDG AND #2 PERFORMED A GAR; PRESUMABLY BECAUSE #1 HAD NOT CLRED THE RWY. WE CONTINUED PAST THE ARPT TO CIRCLE AROUND AND ENTER THE PATTERN ON A 45 DEG ANGLE FOR THE DOWNWIND. #1 AND #2 BOTH JOINED THE DOWNWIND AS WE CONTINUED ON A 45 DEG ANGLE. WE NOTICED THE 2 CESSNAS ON DOWNWIND WERE CLOSE TO EACH OTHER; SO WE SLOWED AIRSPD TO ALLOW MORE SEPARATION. WE HEARD THE CITABRIA HOLDING SHORT ENQUIRE A 5TH ACFT THAT HAD JUST DEPARTED IF THEY WERE 'GOING TO GET A HOTDOG.' THIS XMISSION STEPPED ON #1'S XMISSION FOR TURN TO BASE. #1 XMITTED THE TURN TO FINAL; AND THE CITABRIA HOLDING SHORT WAS HEARD XMITTING 'ARE YOU GUYS EVER GOING TO LET US DEPART?' #2 TURNED AND RPTED BASE LEG AS WE JOINED DOWNWIND AND MADE OUR POS RPT. AS WE APCHED OUR TURN TO BASE; WE NOTED #2 ON FINAL WAS LESS THAN 1/2 NM BEHIND #1 WHO WAS TOUCHING DOWN. WE PROCEEDED TO TURN BASE TO FINAL AND SAW #1 OVER THE DEP END OF THE RWY; #2 OVER MIDFIELD ON A GAR; AND THE CITABRIA TAKING THE RWY. MY STUDENT MADE A CALL TURNING FINAL; AND THE CITABRIA XMITTED; 'CITABRIA; WE GOING TO DEPART NOW; BECAUSE; YEAH.' IT SEEMED THE CITABRIA NOTICED US ON SHORT FINAL AND CHOSE TO DEPART ANYWAY. MY STUDENT ANNOUNCED A GAR AND TOLD THE DEPARTING CITABRIA THAT WE WERE ON THEIR L. THE CITABRIA CONTINUED TO CLB AND HEAD SLIGHTLY L INTO OUR FLT PATH; STILL SLIGHTLY LOWER. I TOOK CTLS FROM THE STUDENT AND HEADED R AND OVER THE RWY TO AVOID THE CITABRIA; WHICH WAS NOW ABOUT 200 FT L AND AHEAD. THE CESSNAS WERE TURNING DOWNWIND AND XWIND; RESPECTIVELY. AS WE APCHED ABEAM THE CITABRIA; IT BEGAN A CLBING TURN TO THE R CLOSE TO OUR FLT PATH AND ANNOUNCED DEPARTING PATTERN TO THE N. I QUICKLY DSNDED AND HELD COURSE EXTENDING UPWIND LEG. I XMITTED 'ACFT DEPARTING N; SOMEHOW YOU SLIPPED TO OUR L. WE ARE DSNDING UPWIND SO YOU WILL CLB OVER US.' THE CITABRIA NEVER CONFIRMED THEY HAD US IN SIGHT; BUT INSTEAD MADE A COMMENT ABOUT HOW BUSY THE PATTERN WAS. I WATCHED THE CITABRIA CLB OVER US THROUGH THE SKYLIGHT WINDOWS. IT WAS ABOUT 100 FT ABOVE US. WE DEPARTED THE PATTERN AND REENTERED AFTER WE HAD CLRED THE AREA. I BELIEVE THE CITABRIA'S IMPATIENCE WAS A CONTRIBUTING HUMAN FACTOR. THE ONLY ACTION TO PREVENT A RECURRENCE IS TO URGE PLTS NOT TO TAKE CHANCES. GIVEN THE RADIO CALL THE CITABRIA MADE WHEN DEPARTING; I BELIEVE THE CITABRIA CLRED THE AREA AND SAW OUR ACFT ON FINAL; AND DECIDED TO DEPART ANYWAY.

Data retrieved from NASA's ASRS site as of May 2009 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.