ARTCC radar controller inadvertently assigned the wrong altitude to descending medium large transport and had less than standard separation with climbing small transport. Operational error.

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Attributes
ACN	88722
Time
Date	198806
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : rid
State Reference	IN
Altitude	msl bound lower : 11000 msl bound upper : 11600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent other
Route In Use	arrival other enroute : on vectors enroute airway : zid
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 6
ASRS Report	88722
Person 2
Affiliation	government : faa
Function	controller : flight data
Qualification	controller : non radar controller : developmental
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation other anomaly other
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated Other
Miss Distance	horizontal : 16800 vertical : 600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Intra Facility Coordination Failure Inter Facility Coordination Failure Operational Error

Narrative:

Air carrier aircraft landing at dayton, oh, descending over top of small transport Y departing cincinnati to the north. In an effort to keep the air carrier descending to meet agreement with dayton approach control the small transport Y was assigned a lower altitude. The air carrier was then mistakenly assigned the same altitude instead of 1000' above the air taxi. Sep was lost. Callback conversation with reporter revealed the following: reporter specified type aircraft involved. Medium large transport was descending and small transport was climbing, reporter meant to stop the medium large transport at 12000', but inadvertently stated 11000' in the clearance. Reporter had a data controller, but he was not usable for coordination due to personal problem that had occurred prior to reporter assuming the radar position. Traffic vol was light and reporter was coordinated with approach control to stop the small transport climb at 11000' so he could take the medium large transport over him at 12000'. Traffic advisory was given, but no indication if the aircraft saw each other. Was classified a minor infringement.

Original NASA ASRS Text

Title: ARTCC RADAR CTLR INADVERTENTLY ASSIGNED THE WRONG ALT TO DESCENDING MLG AND HAD LESS THAN STANDARD SEPARATION WITH CLIMBING SMT. OPERATIONAL ERROR.

Narrative: ACR ACFT LNDG AT DAYTON, OH, DSNDING OVER TOP OF SMT Y DEPARTING CINCINNATI TO THE N. IN AN EFFORT TO KEEP THE ACR DSNDING TO MEET AGREEMENT WITH DAYTON APCH CTL THE SMT Y WAS ASSIGNED A LOWER ALT. THE ACR WAS THEN MISTAKENLY ASSIGNED THE SAME ALT INSTEAD OF 1000' ABOVE THE AIR TAXI. SEP WAS LOST. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: RPTR SPECIFIED TYPE ACFT INVOLVED. MLG WAS DSNDING AND SMT WAS CLBING, RPTR MEANT TO STOP THE MLG AT 12000', BUT INADVERTENTLY STATED 11000' IN THE CLRNC. RPTR HAD A DATA CTLR, BUT HE WAS NOT USABLE FOR COORD DUE TO PERSONAL PROB THAT HAD OCCURRED PRIOR TO RPTR ASSUMING THE RADAR POS. TFC VOL WAS LIGHT AND RPTR WAS COORDINATED WITH APCH CTL TO STOP THE SMT CLB AT 11000' SO HE COULD TAKE THE MLG OVER HIM AT 12000'. TFC ADVISORY WAS GIVEN, BUT NO INDICATION IF THE ACFT SAW EACH OTHER. WAS CLASSIFIED A MINOR INFRINGEMENT.

Data retrieved from NASA's ASRS site as of August 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.