Medium large transport levels at wrong altitude.

Attributes
ACN	233000
Time
Date	199302
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : gmn
State Reference	CA
Altitude	msl bound lower : 22000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zla
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 10000 flight time type : 240
ASRS Report	233000
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Climb to and level off at FL230. Approximately 1 min later, controller asked our altitude. When we replied FL230, he responded the clearance was to FL220. He also stated we read back FL220. This both I and my first officer disputed, although the first officer speaks very softly. I might have missed his readback, and the controller might have. To our query as to whether we should descend, he said no. About 2 mins later we were given FL240. Later phone call we were told 'no problem,' separation 6 mi. Supervisor said it would go no further.

Original NASA ASRS Text

Title: MLG LEVELS AT WRONG ALT.

Narrative: CLB TO AND LEVEL OFF AT FL230. APPROX 1 MIN LATER, CTLR ASKED OUR ALT. WHEN WE REPLIED FL230, HE RESPONDED THE CLRNC WAS TO FL220. HE ALSO STATED WE READ BACK FL220. THIS BOTH I AND MY FO DISPUTED, ALTHOUGH THE FO SPEAKS VERY SOFTLY. I MIGHT HAVE MISSED HIS READBACK, AND THE CTLR MIGHT HAVE. TO OUR QUERY AS TO WHETHER WE SHOULD DSND, HE SAID NO. ABOUT 2 MINS LATER WE WERE GIVEN FL240. LATER PHONE CALL WE WERE TOLD 'NO PROB,' SEPARATION 6 MI. SUPVR SAID IT WOULD GO NO FURTHER.

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.