Aircraft climbed above assigned altitude due to readback hearback problem.

Attributes
ACN	159432
Time
Date	199010
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fll airport : mia
State Reference	FL
Altitude	msl bound lower : 10000 msl bound upper : 13000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
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
Route In Use	departure other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 261 flight time total : 19882 flight time type : 14629
ASRS Report	159432
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	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

Departed fll on runway 9L on runway heading to 3000'. Frequency change to mia departure (126.05). New clearance, left turn to heading 280 degree climb to 13000'. I read back clearance, both heading and altitude (company procedure) and then set heading bug on HSI and set 13000' on altitude alerter. Out of 12000' I made 1000' call out. Out of about 12400' controller told us we were only cleared to 10000'. First officer immediately leveled off. I asked controller why he did not catch their error on my readback. His response was, maintain 12000' and a new frequency. There is no doubt in both of our minds that the altitude clearance was 13000'. Where was the controller on my readback, where was he when we were climbing through 10000' and 11000'. I don't know what caused this error, but I do know its hell to live and work in a police state atmosphere.

Original NASA ASRS Text

Title: ACFT CLIMBED ABOVE ASSIGNED ALT DUE TO READBACK HEARBACK PROBLEM.

Narrative: DEPARTED FLL ON RWY 9L ON RWY HDG TO 3000'. FREQ CHANGE TO MIA DEP (126.05). NEW CLRNC, L TURN TO HDG 280 DEG CLB TO 13000'. I READ BACK CLRNC, BOTH HDG AND ALT (COMPANY PROC) AND THEN SET HDG BUG ON HSI AND SET 13000' ON ALT ALERTER. OUT OF 12000' I MADE 1000' CALL OUT. OUT OF ABOUT 12400' CTLR TOLD US WE WERE ONLY CLRED TO 10000'. F/O IMMEDIATELY LEVELED OFF. I ASKED CTLR WHY HE DID NOT CATCH THEIR ERROR ON MY READBACK. HIS RESPONSE WAS, MAINTAIN 12000' AND A NEW FREQ. THERE IS NO DOUBT IN BOTH OF OUR MINDS THAT THE ALT CLRNC WAS 13000'. WHERE WAS THE CTLR ON MY READBACK, WHERE WAS HE WHEN WE WERE CLBING THROUGH 10000' AND 11000'. I DON'T KNOW WHAT CAUSED THIS ERROR, BUT I DO KNOW ITS HELL TO LIVE AND WORK IN A POLICE STATE ATMOSPHERE.

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.