Less than standard separation between a descending BE35 and a E120 level at 6000 ft. The descending aircraft was on approach frequency and the E120 was on the center frequency. Reporter saw the potential conflict but did nothing to avert the situation until told to descend the E120 to 5000 ft by the approach controller. The instruction was issued but was not acknowledged. The BE35 was observed in a climb mode. The E120 received an RA. The flight crew said they were at 7000 ft but the mode C showed 6000 ft.

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Attributes
ACN	351084
Time
Date	199610
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : djb airport : cle
State Reference	OH
Altitude	msl bound lower : 6000 msl bound upper : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob tracon : cle
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 135
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Bonanza 35
Operating Under FAR Part	Part 91
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 7 flight time total : 100
ASRS Report	351084
Person 2
Affiliation	government : faa
Function	controller : departure
Qualification	controller : radar
Events
Anomaly	non adherence : required legal separation non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 350
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X had departed cle en route to dtw and was level at 6000 ft. Aircraft Y was inbound to bkl in a descent mode. Both aircraft were well inside cle approach airspace. I had the handoff on air carrier X only, and he was on my frequency. I saw the potential problem when the aircraft were approximately 8 mi apart, head-on. Air carrier X also saw the problem and asked me if he had traffic. I read him the traffic, realizing that either cle approach was using visual incorrectly or that they had not seen their error. At this time air carrier X advises me he is responding to an RA. Cle approach calls at the same time and my d-side answers. Cle tells me to descend air carrier X immediately to 5000 ft. I do this but get no response from air carrier X. Next, air carrier X tells me he is at 7000 ft. Mode C still shows air carrier X at 6000 ft, and the other aircraft in a climb mode from 6000 ft to 6400 ft. The aircraft pass. Later, air carrier X is reassigned 6000 ft. I make no communication with cle approach on this matter. I continue to work the sector until it is my turn for a break.

Original NASA ASRS Text

Title: LTSS BTWN A DSNDING BE35 AND A E120 LEVEL AT 6000 FT. THE DSNDING ACFT WAS ON APCH FREQ AND THE E120 WAS ON THE CTR FREQ. RPTR SAW THE POTENTIAL CONFLICT BUT DID NOTHING TO AVERT THE SIT UNTIL TOLD TO DSND THE E120 TO 5000 FT BY THE APCH CTLR. THE INSTRUCTION WAS ISSUED BUT WAS NOT ACKNOWLEDGED. THE BE35 WAS OBSERVED IN A CLB MODE. THE E120 RECEIVED AN RA. THE FLC SAID THEY WERE AT 7000 FT BUT THE MODE C SHOWED 6000 FT.

Narrative: ACR X HAD DEPARTED CLE ENRTE TO DTW AND WAS LEVEL AT 6000 FT. ACFT Y WAS INBOUND TO BKL IN A DSCNT MODE. BOTH ACFT WERE WELL INSIDE CLE APCH AIRSPACE. I HAD THE HDOF ON ACR X ONLY, AND HE WAS ON MY FREQ. I SAW THE POTENTIAL PROB WHEN THE ACFT WERE APPROX 8 MI APART, HEAD-ON. ACR X ALSO SAW THE PROB AND ASKED ME IF HE HAD TFC. I READ HIM THE TFC, REALIZING THAT EITHER CLE APCH WAS USING VISUAL INCORRECTLY OR THAT THEY HAD NOT SEEN THEIR ERROR. AT THIS TIME ACR X ADVISES ME HE IS RESPONDING TO AN RA. CLE APCH CALLS AT THE SAME TIME AND MY D-SIDE ANSWERS. CLE TELLS ME TO DSND ACR X IMMEDIATELY TO 5000 FT. I DO THIS BUT GET NO RESPONSE FROM ACR X. NEXT, ACR X TELLS ME HE IS AT 7000 FT. MODE C STILL SHOWS ACR X AT 6000 FT, AND THE OTHER ACFT IN A CLB MODE FROM 6000 FT TO 6400 FT. THE ACFT PASS. LATER, ACR X IS REASSIGNED 6000 FT. I MAKE NO COM WITH CLE APCH ON THIS MATTER. I CONTINUE TO WORK THE SECTOR UNTIL IT IS MY TURN FOR A BREAK.

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.