An MD80 flight crew overshoots their altitude assigned for a go around missed approach at stl, mo.

Attributes
ACN	475070
Time
Date	200006
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl.airport
State Reference	MO
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : t75.tracon tower : stl.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 270 flight time total : 8000 flight time type : 2100
ASRS Report	475070
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 210 flight time total : 4900 flight time type : 400
ASRS Report	475246
Events
Anomaly	altitude deviation : overshoot non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Thought we were cleared to 4000 ft but at leveloff first officer was unsure and thought we may have been cleared to 3000 ft. Upon verification with approach control, they said 'maintain 4000 ft.' no other statements about altitude. Since we are unsure we are submitting this report.

Original NASA ASRS Text

Title: AN MD80 FLC OVERSHOOTS THEIR ALT ASSIGNED FOR A GAR MISSED APCH AT STL, MO.

Narrative: THOUGHT WE WERE CLRED TO 4000 FT BUT AT LEVELOFF FO WAS UNSURE AND THOUGHT WE MAY HAVE BEEN CLRED TO 3000 FT. UPON VERIFICATION WITH APCH CTL, THEY SAID 'MAINTAIN 4000 FT.' NO OTHER STATEMENTS ABOUT ALT. SINCE WE ARE UNSURE WE ARE SUBMITTING THIS RPT.

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.