Altitude deviation.

Attributes
ACN	306180
Time
Date	199506
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 5200 msl bound upper : 5500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : stl artcc : zlc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 8000 flight time type : 3000
ASRS Report	306180
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Deviated from assigned altitude of 5500 ft MSL. Descended to approximately 5200 ft MSL then corrected back to 5500 ft. No known traffic conflict. Was looking for traffic on the runway 30R approach.

Original NASA ASRS Text

Title: ALTDEV.

Narrative: DEVIATED FROM ASSIGNED ALT OF 5500 FT MSL. DSNDED TO APPROX 5200 FT MSL THEN CORRECTED BACK TO 5500 FT. NO KNOWN TFC CONFLICT. WAS LOOKING FOR TFC ON THE RWY 30R APCH.

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.