ARTCC radar controller descends one aircraft through the altitude of another holding aircraft. Controller expected oedp would have alerted him to pending loss of separation.

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Attributes
ACN	410817
Time
Date	199808
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cle
State Reference	OH
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent other other
Route In Use	approach : circling arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	other
Route In Use	approach : circling arrival other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 11
ASRS Report	410817
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 15600 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Situation arose from holding aircraft on a VFR day because of incompetence at cle approach. I cleared the #1 aircraft down through the #2 aircraft thinking I was clearing a different aircraft. A bad decision on my part and conflict alert did not warn me about the situation.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR DSNDS ONE ACFT THROUGH THE ALT OF ANOTHER HOLDING ACFT. CTLR EXPECTED OEDP WOULD HAVE ALERTED HIM TO PENDING LOSS OF SEPARATION.

Narrative: SIT AROSE FROM HOLDING ACFT ON A VFR DAY BECAUSE OF INCOMPETENCE AT CLE APCH. I CLRED THE #1 ACFT DOWN THROUGH THE #2 ACFT THINKING I WAS CLRING A DIFFERENT ACFT. A BAD DECISION ON MY PART AND CONFLICT ALERT DID NOT WARN ME ABOUT THE SIT.

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.