A B757 flight crew climbed above assigned altitude near mco.

Attributes
ACN	450400
Time
Date	199909
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mco.airport
State Reference	FL
Altitude	msl bound lower : 14000 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 140 flight time total : 12000 flight time type : 1300
ASRS Report	450400
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to assigned altitude
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Assigned 14000 ft by ATC, set 15000 ft in altitude window. Understood we were cleared to 15000 ft. ATC told us to descend to 14000 ft as assigned. Descended to 14000 ft. Both pilots thought we were assigned 15000 ft. Some distraction in avoiding small cells wnw of field.

Original NASA ASRS Text

Title: A B757 FLC CLBED ABOVE ASSIGNED ALT NEAR MCO.

Narrative: ASSIGNED 14000 FT BY ATC, SET 15000 FT IN ALT WINDOW. UNDERSTOOD WE WERE CLRED TO 15000 FT. ATC TOLD US TO DSND TO 14000 FT AS ASSIGNED. DSNDED TO 14000 FT. BOTH PLTS THOUGHT WE WERE ASSIGNED 15000 FT. SOME DISTR IN AVOIDING SMALL CELLS WNW OF FIELD.

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.