An light transport departing ord exceeds his leveloff altitude by 300 ft.

Attributes
ACN	400580
Time
Date	199804
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	msl bound lower : 5000 msl bound upper : 5300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : ord
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 4200
ASRS Report	400580
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : overshoot non adherence : clearance
Independent Detector	atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Climbed through assigned altitude by 300 ft. Corrected back to assigned altitude immediately. Departure control said 'maintain 5000 ft' and that's all. Occurred at approximately XA00Z. Altitude alerter did not function properly. No evasive action was required. Less reliance on altitude alerters and constant awareness of current aircraft position in compliance with ATC instructions. Should remedy the problem.

Original NASA ASRS Text

Title: AN LTT DEPARTING ORD EXCEEDS HIS LEVELOFF ALT BY 300 FT.

Narrative: CLBED THROUGH ASSIGNED ALT BY 300 FT. CORRECTED BACK TO ASSIGNED ALT IMMEDIATELY. DEP CTL SAID 'MAINTAIN 5000 FT' AND THAT'S ALL. OCCURRED AT APPROX XA00Z. ALT ALERTER DID NOT FUNCTION PROPERLY. NO EVASIVE ACTION WAS REQUIRED. LESS RELIANCE ON ALT ALERTERS AND CONSTANT AWARENESS OF CURRENT ACFT POS IN COMPLIANCE WITH ATC INSTRUCTIONS. SHOULD REMEDY THE PROB.

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.