TRACON approach controller observed an MD88 on a parallel approach get in close proximity to an MD88 on his frequency. Conflict alert was activated and traffic information was given to the MD88 on the reporter's frequency.

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Attributes
ACN	392200
Time
Date	199801
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 4000 msl bound upper : 4700
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar pilot : instrument
Experience	controller radar : 20 flight time total : 350
ASRS Report	392200
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other spatial deviation
Independent Detector	atc equipment other atc equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 7500 vertical : 700
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Simultaneous ILS approachs runway 18R/left in use at cvg. My aircraft X being monitored at 4000 ft and established and on frequency. The 'hi side' aircraft Y (5000 ft) rolled out slightly off course, near the no transgression zone. Near the outer fix, the aircraft began correcting and began descent. Immediately the conflict alert alarmed and the low side aircraft X inquired about traffic. I observed the divergence and altitude and informed my traffic. The 5000 ft traffic was cleared to maintain 5000 ft until established on localizer, but started down while slightly off and correcting. I feel the pilot deviated from instructions (approach clearance) and the timing of the event did not allow any action until the situation began.

Original NASA ASRS Text

Title: TRACON APCH CTLR OBSERVED AN MD88 ON A PARALLEL APCH GET IN CLOSE PROX TO AN MD88 ON HIS FREQ. CONFLICT ALERT WAS ACTIVATED AND TFC INFO WAS GIVEN TO THE MD88 ON THE RPTR'S FREQ.

Narrative: SIMULTANEOUS ILS APCHS RWY 18R/L IN USE AT CVG. MY ACFT X BEING MONITORED AT 4000 FT AND ESTABLISHED AND ON FREQ. THE 'HI SIDE' ACFT Y (5000 FT) ROLLED OUT SLIGHTLY OFF COURSE, NEAR THE NO TRANSGRESSION ZONE. NEAR THE OUTER FIX, THE ACFT BEGAN CORRECTING AND BEGAN DSCNT. IMMEDIATELY THE CONFLICT ALERT ALARMED AND THE LOW SIDE ACFT X INQUIRED ABOUT TFC. I OBSERVED THE DIVERGENCE AND ALT AND INFORMED MY TFC. THE 5000 FT TFC WAS CLRED TO MAINTAIN 5000 FT UNTIL ESTABLISHED ON LOC, BUT STARTED DOWN WHILE SLIGHTLY OFF AND CORRECTING. I FEEL THE PLT DEVIATED FROM INSTRUCTIONS (APCH CLRNC) AND THE TIMING OF THE EVENT DID NOT ALLOW ANY ACTION UNTIL THE SIT BEGAN.

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.