Near midair collision between a piper PA28 on 2 mi right base at cgi, and a cessna on a left base cr...

Attributes
ACN	558714
Time
Date	200208
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cgi.airport
State Reference	MO
Altitude	msl single value : 1200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : cgi.tower
Operator	general aviation : personal
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tower : cgi.tower
Operator	general aviation : personal
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : traffic pattern
Flight Plan	VFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 70 flight time total : 482 flight time type : 300
ASRS Report	558714
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other flight crewa
Resolutory Action	controller : issued advisory none taken : insufficient time
Consequence	faa : reviewed incident with flight crew other
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On aug/xa/02, I was en route to cgi airport on a VFR flight plan under VMC, scattered clouds at 6000 ft MSL, visibility greater than 6 mi, winds 040 degrees at 6 KTS, no other significant WX. At 20 NM out, I began monitoring the tower frequency. 3 other aircraft were inbound from the northwest and northeast. At 10 NM, approximately XA00Z, I made my initial call to the tower and was instructed to report a 5 mi right base for runway 10. Shortly prior to my call, the controller instructed a cessna, unknown type, approaching from the north, to call a 2 mi left base for the same runway. At approximately 4 mi out, the cessna informed the tower he was executing a 360 degree turn to 'lose some altitude.' the controller responded by asking the cessna his current position because he had a cherokee coming in from the south, my aircraft. Although no traffic warning was issued, I informed the controller I did not have the aircraft in sight and was now on a 5 mi right base at 1200 ft. I was instructed to report a 2 mi base. After no response from the cessna, the controller informed the cessna he was not in sight. After several seconds, the cessna pilot stated he was 2 mi from the approach end of runway 10. At this point, I was on a 2.4 mi right base. The cessna then passed directly overhead going in the opposite direction at approximately 1500 ft. I informed the controller that the cessna was directly overhead, opposite direction, and was now no factor. I was then cleared to land. In my assessment, the controller failed to obtain adequate information from inbound aircraft (distance/bearing from airport with VOR on field, altitude, speed), provide adequate spacing of aircraft, nor did he provide adequate traffic warnings. I will also note that during our departure after lunch the same controller became confused, which he actually stated to the pilot, as to the location of aircraft inbound to cgi.

Original NASA ASRS Text

Title: NMAC BTWN A PIPER PA28 ON 2 MI R BASE AT CGI, AND A CESSNA ON A L BASE XING 400 FT OVER THE TOP OF THE PIPER. TWR CTLR HAD DIFFICULTY LEARNING THE EXACT LOCATION OF THE CESSNA SINCE IT WAS NOT IN SIGHT.

Narrative: ON AUG/XA/02, I WAS ENRTE TO CGI ARPT ON A VFR FLT PLAN UNDER VMC, SCATTERED CLOUDS AT 6000 FT MSL, VISIBILITY GREATER THAN 6 MI, WINDS 040 DEGS AT 6 KTS, NO OTHER SIGNIFICANT WX. AT 20 NM OUT, I BEGAN MONITORING THE TWR FREQ. 3 OTHER ACFT WERE INBOUND FROM THE NW AND NE. AT 10 NM, APPROX XA00Z, I MADE MY INITIAL CALL TO THE TWR AND WAS INSTRUCTED TO RPT A 5 MI R BASE FOR RWY 10. SHORTLY PRIOR TO MY CALL, THE CTLR INSTRUCTED A CESSNA, UNKNOWN TYPE, APCHING FROM THE N, TO CALL A 2 MI L BASE FOR THE SAME RWY. AT APPROX 4 MI OUT, THE CESSNA INFORMED THE TWR HE WAS EXECUTING A 360 DEG TURN TO 'LOSE SOME ALT.' THE CTLR RESPONDED BY ASKING THE CESSNA HIS CURRENT POS BECAUSE HE HAD A CHEROKEE COMING IN FROM THE S, MY ACFT. ALTHOUGH NO TFC WARNING WAS ISSUED, I INFORMED THE CTLR I DID NOT HAVE THE ACFT IN SIGHT AND WAS NOW ON A 5 MI R BASE AT 1200 FT. I WAS INSTRUCTED TO RPT A 2 MI BASE. AFTER NO RESPONSE FROM THE CESSNA, THE CTLR INFORMED THE CESSNA HE WAS NOT IN SIGHT. AFTER SEVERAL SECONDS, THE CESSNA PLT STATED HE WAS 2 MI FROM THE APCH END OF RWY 10. AT THIS POINT, I WAS ON A 2.4 MI R BASE. THE CESSNA THEN PASSED DIRECTLY OVERHEAD GOING IN THE OPPOSITE DIRECTION AT APPROX 1500 FT. I INFORMED THE CTLR THAT THE CESSNA WAS DIRECTLY OVERHEAD, OPPOSITE DIRECTION, AND WAS NOW NO FACTOR. I WAS THEN CLRED TO LAND. IN MY ASSESSMENT, THE CTLR FAILED TO OBTAIN ADEQUATE INFO FROM INBOUND ACFT (DISTANCE/BEARING FROM ARPT WITH VOR ON FIELD, ALT, SPD), PROVIDE ADEQUATE SPACING OF ACFT, NOR DID HE PROVIDE ADEQUATE TFC WARNINGS. I WILL ALSO NOTE THAT DURING OUR DEP AFTER LUNCH THE SAME CTLR BECAME CONFUSED, WHICH HE ACTUALLY STATED TO THE PLT, AS TO THE LOCATION OF ACFT INBOUND TO CGI.

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.

Near midair collision between a piper PA28 on 2 mi right base at cgi, and a cessna on a left base crossing 400 ft over the top of the piper. Tower controller had difficulty learning the exact location of the cessna since it was not in sight.