After a clearance to climb is amended to return to the original altitude, descent is begun. B757 has a TCASII traffic alert for aircraft above.

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Attributes
ACN	523930
Time
Date	200109
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : atl.vortac
State Reference	GA
Altitude	msl bound lower : 20000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : o90.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : ztl.artcc
Make Model Name	Commercial Fixed Wing
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : flight engineer pilot : multi engine pilot : instrument
Experience	flight time total : 16000
ASRS Report	523930
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Resolutory Action	controller : issued new clearance controller : separated traffic
Miss Distance	horizontal : 5000 vertical : 1000
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Cleared from FL200 to FL230. At FL208 cleared back down to FL200. Traffic alert sounded at FL207. Returned to FL200. Traffic alert silenced.

Original NASA ASRS Text

Title: AFTER A CLRNC TO CLB IS AMENDED TO RETURN TO THE ORIGINAL ALT, DSCNT IS BEGUN. B757 HAS A TCASII TFC ALERT FOR ACFT ABOVE.

Narrative: CLRED FROM FL200 TO FL230. AT FL208 CLRED BACK DOWN TO FL200. TFC ALERT SOUNDED AT FL207. RETURNED TO FL200. TFC ALERT SILENCED.

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.