Flight crew believed they had received clearance to climb to FL240, read back same and climbed to that altitude. ARTCC radar controller questioned altitude and said clearance was FL230.

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Attributes
ACN	117346
Time
Date	198907
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dfw
State Reference	TX
Altitude	msl bound lower : 23000 msl bound upper : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	climbout : intermediate altitude cruise other cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 5500 flight time type : 200
ASRS Report	117346
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : overshoot other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

Controller gave heading and altitude assignment of 110 degree and FL240 for direct esf (alexandria, la) flight # air carrier xx. We complied. At approximately xa am ZFW asked us to verify altitude. We responded 'FL240'. Center said we were told FL230. I said we were told heading 110 degree and FL240. I also had read this clearance back to the controller at the time of the initial assignment. After the incident I told the controller to mark the tape. I would really like to know what happened here.

Original NASA ASRS Text

Title: FLT CREW BELIEVED THEY HAD RECEIVED CLRNC TO CLIMB TO FL240, READ BACK SAME AND CLIMBED TO THAT ALT. ARTCC RADAR CTLR QUESTIONED ALT AND SAID CLRNC WAS FL230.

Narrative: CTLR GAVE HDG AND ALT ASSIGNMENT OF 110 DEG AND FL240 FOR DIRECT ESF (ALEXANDRIA, LA) FLT # ACR XX. WE COMPLIED. AT APPROX XA AM ZFW ASKED US TO VERIFY ALT. WE RESPONDED 'FL240'. CENTER SAID WE WERE TOLD FL230. I SAID WE WERE TOLD HDG 110 DEG AND FL240. I ALSO HAD READ THIS CLRNC BACK TO THE CTLR AT THE TIME OF THE INITIAL ASSIGNMENT. AFTER THE INCIDENT I TOLD THE CTLR TO MARK THE TAPE. I WOULD REALLY LIKE TO KNOW WHAT HAPPENED HERE.

Data retrieved from NASA's ASRS site as of August 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.