A B757 pilot reports expecting a clearance to FL230 departing clt. The crew climbed to FL230 when a clearance to FL220 had been given.

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Attributes
ACN	717573
Time
Date	200611
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : zjx.artcc
State Reference	FL
Altitude	msl bound lower : 22000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl.artcc artcc : zjx.artcc tower : sua.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	717573
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 5000
ASRS Report	717667
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued alert flight crew : returned to assigned altitude
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

This was a readback/hearback error. Normally climbing out of clt; ZTL will clear us to 'climb to FL230; normal speed.' we believed we were given this clearance; read it back; and performed our altitude awareness procedure (set; point; verbalize). We climbed to FL230. After being switched to ZJX; we were questioned about our altitude. The controller thought we should be at FL220. We descended to FL220 per his clearance. As far as we know there was no traffic conflict.

Original NASA ASRS Text

Title: A B757 PLT RPTS EXPECTING A CLRNC TO FL230 DEPARTING CLT. THE CREW CLBED TO FL230 WHEN A CLRNC TO FL220 HAD BEEN GIVEN.

Narrative: THIS WAS A READBACK/HEARBACK ERROR. NORMALLY CLBING OUT OF CLT; ZTL WILL CLR US TO 'CLB TO FL230; NORMAL SPD.' WE BELIEVED WE WERE GIVEN THIS CLRNC; READ IT BACK; AND PERFORMED OUR ALT AWARENESS PROC (SET; POINT; VERBALIZE). WE CLBED TO FL230. AFTER BEING SWITCHED TO ZJX; WE WERE QUESTIONED ABOUT OUR ALT. THE CTLR THOUGHT WE SHOULD BE AT FL220. WE DSNDED TO FL220 PER HIS CLRNC. AS FAR AS WE KNOW THERE WAS NO TFC CONFLICT.

Data retrieved from NASA's ASRS site as of January 2009 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.