While climbing an A320 to FL270 and observing the flight leaving FL232, a ZLA ARTCC radar controller cleared a climbing C525 to FL230. Noting the A320 stopping climb, the controller reclred the C525 5O FL220, but missed an incorrect readback to maintain FL230.

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Attributes
ACN	636354
Time
Date	200411
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : sli.vortac
State Reference	CA
Altitude	msl bound lower : 22600 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	general aviation : personal
Make Model Name	Citationjet, C525/C526
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	climbout : vacating altitude climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar pilot : instrument
Experience	controller radar : 2.5 controller time certified in position1 : 1 flight time total : 249
ASRS Report	636354
Person 2
Affiliation	government : faa
Function	controller : handoff position
Qualification	controller : radar pilot : private
Experience	controller radar : 15 flight time total : 200
ASRS Report	636583
Events
Anomaly	conflict : airborne critical non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Miss Distance	horizontal : 6000 vertical : 400
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier Y was climbed to FL270, showed FL232, climbing. I climbed aircraft X to FL230 and issued traffic. I then amended aircraft X's altitude to FL220 because air carrier Y's temporary altitude showed FL230. Aircraft X read back FL230 and I did not catch it. Air carrier X was descended back into my airspace from high altitude. Supplemental information from acn 636583: the A320 was at FL232 descending back to FL230 and received an RA on a C550 climbing to FL230 below him. Supplemental information from acn 636584: air carrier Y stopped at FL230 for traffic. Low altitude sector climbed C525 aircraft to FL230 then realized air carrier Y was not climbing and stopped C525 at FL220. C525 read back climb to FL230.

Original NASA ASRS Text

Title: WHILE CLBING AN A320 TO FL270 AND OBSERVING THE FLT LEAVING FL232, A ZLA ARTCC RADAR CTLR CLRED A CLBING C525 TO FL230. NOTING THE A320 STOPPING CLB, THE CTLR RECLRED THE C525 5O FL220, BUT MISSED AN INCORRECT READBACK TO MAINTAIN FL230.

Narrative: ACR Y WAS CLBED TO FL270, SHOWED FL232, CLBING. I CLBED ACFT X TO FL230 AND ISSUED TFC. I THEN AMENDED ACFT X'S ALT TO FL220 BECAUSE ACR Y'S TEMPORARY ALT SHOWED FL230. ACFT X READ BACK FL230 AND I DID NOT CATCH IT. ACR X WAS DSNDED BACK INTO MY AIRSPACE FROM HIGH ALT. SUPPLEMENTAL INFO FROM ACN 636583: THE A320 WAS AT FL232 DSNDING BACK TO FL230 AND RECEIVED AN RA ON A C550 CLBING TO FL230 BELOW HIM. SUPPLEMENTAL INFO FROM ACN 636584: ACR Y STOPPED AT FL230 FOR TFC. LOW ALT SECTOR CLBED C525 ACFT TO FL230 THEN REALIZED ACR Y WAS NOT CLBING AND STOPPED C525 AT FL220. C525 READ BACK CLB TO FL230.

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.