Acknowledged descent pd to 4000. Controller says clearance to 6000.

Attributes
ACN	162639
Time
Date	199011
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mia
State Reference	FL
Altitude	msl bound lower : 4000 msl bound upper : 5500
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 190 flight time total : 3700 flight time type : 150
ASRS Report	162639
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other anomaly other
Independent Detector	other controllera
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

Flying at 10000' en route to apf. ATC instructed us to leave 10000' for 9000' with pilots discretion to 4000'. I responded, leaving 10000' for 4000'. Crossing through 5500' ATC advised that we should have been level at 6000' due to traffic. This report stresses the need for controllers to listen to readbacks.

Original NASA ASRS Text

Title: ACKNOWLEDGED DESCENT PD TO 4000. CTLR SAYS CLRNC TO 6000.

Narrative: FLYING AT 10000' ENRTE TO APF. ATC INSTRUCTED US TO LEAVE 10000' FOR 9000' WITH PLTS DISCRETION TO 4000'. I RESPONDED, LEAVING 10000' FOR 4000'. XING THROUGH 5500' ATC ADVISED THAT WE SHOULD HAVE BEEN LEVEL AT 6000' DUE TO TFC. THIS RPT STRESSES THE NEED FOR CTLRS TO LISTEN TO READBACKS.

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.