A similar call sign may have caused an air carrier to begin a climb to an occupied altitude over ykm...

Attributes
ACN	559668
Time
Date	200208
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dls.airport
State Reference	OR
Altitude	msl single value : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zse.artcc tower : ord.tower
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zse.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : handoff position controller : radar
Qualification	controller : developmental
Experience	controller non radar : 1
ASRS Report	559668
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	atc equipment : conflict alert
Resolutory Action	flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	vertical : 1300
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Aircraft Y was at FL290. Aircraft X at FL280. My right side climbed another aircraft, aircraft Z, to FL290. I was on a landline giving a pointout to sector 16 when aircraft X read back the clearance. Aircraft X converged with aircraft Y, who by that time was climbing, approximately out of FL303.

Original NASA ASRS Text

Title: A SIMILAR CALL SIGN MAY HAVE CAUSED AN ACR TO BEGIN A CLB TO AN OCCUPIED ALT OVER YKM.

Narrative: ACFT Y WAS AT FL290. ACFT X AT FL280. MY R SIDE CLBED ANOTHER ACFT, ACFT Z, TO FL290. I WAS ON A LANDLINE GIVING A POINTOUT TO SECTOR 16 WHEN ACFT X READ BACK THE CLRNC. ACFT X CONVERGED WITH ACFT Y, WHO BY THAT TIME WAS CLBING, APPROX OUT OF FL303.

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.