ZOB developmental assigns incorrect altitude to descending E135, overtaking B190 in cle airspace.

Attributes
ACN	496777
Time
Date	200101
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : djb.vortac
State Reference	OH
Altitude	msl single value : 9000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zob.artcc tracon : cle.tracon
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 135 ER&LR
Operating Under FAR Part	Part 121
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc tracon : cle.tracon
Operator	common carrier : air taxi
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar instruction : trainee
Qualification	controller : developmental
Experience	controller military : 7 controller radar : 2
ASRS Report	496777
Person 2
Affiliation	government : faa
Function	controller : radar instruction : instructor
ASRS Report	496778
Events
Anomaly	non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment : conflict alert other controllera
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 1800 vertical : 0
Supplementary
Problem Areas	Airspace Structure ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Inbound propeller (aircraft Y) to cle at 9000 ft was first inbound. Jet (aircraft X) was given 10000 ft, 10 mi in-trail. Transmission was blocked and the jet was mistakenly given 9000 ft. Traffic was then issued on the propeller and frequency change to approach control was given.

Original NASA ASRS Text

Title: ZOB DEVELOPMENTAL ASSIGNS INCORRECT ALT TO DSNDING E135, OVERTAKING B190 IN CLE AIRSPACE.

Narrative: INBOUND PROP (ACFT Y) TO CLE AT 9000 FT WAS FIRST INBOUND. JET (ACFT X) WAS GIVEN 10000 FT, 10 MI IN-TRAIL. XMISSION WAS BLOCKED AND THE JET WAS MISTAKENLY GIVEN 9000 FT. TFC WAS THEN ISSUED ON THE PROP AND FREQ CHANGE TO APCH CTL WAS GIVEN.

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.