Flight crew of medium large transport read back clearance to climb to FL230. Controller challenged their climb above FL200 but then allowed them to stay at FL230.

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Attributes
ACN	112736
Time
Date	198906
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : tlh
State Reference	FL
Altitude	msl bound lower : 20000 msl bound upper : 23000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zjx
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 240 flight time total : 4000 flight time type : 1500
ASRS Report	112736
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

Captain flying. First officer (me) off frequency working radio. 130 mi southeast of tlh climb clearance was received to 'climb and maintain FL230' which was read back 'up to 230'. Upon reaching FL230 controller key on and said '...you overshot your altitude. You were assigned FL200.' captain replied 'no sir, we were given 230 and read it back.' controller said 'no problem stay at 230. I didn't have anybody there anyway. No problem.'

Original NASA ASRS Text

Title: FLT CREW OF MLG READ BACK CLRNC TO CLIMB TO FL230. CTLR CHALLENGED THEIR CLIMB ABOVE FL200 BUT THEN ALLOWED THEM TO STAY AT FL230.

Narrative: CAPT FLYING. F/O (ME) OFF FREQ WORKING RADIO. 130 MI SE OF TLH CLIMB CLRNC WAS RECEIVED TO 'CLIMB AND MAINTAIN FL230' WHICH WAS READ BACK 'UP TO 230'. UPON REACHING FL230 CTLR KEY ON AND SAID '...YOU OVERSHOT YOUR ALT. YOU WERE ASSIGNED FL200.' CAPT REPLIED 'NO SIR, WE WERE GIVEN 230 AND READ IT BACK.' CTLR SAID 'NO PROBLEM STAY AT 230. I DIDN'T HAVE ANYBODY THERE ANYWAY. NO PROBLEM.'

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.