Air carrier has altitude deviation, climbing above assigned.

Attributes
ACN	307180
Time
Date	199506
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : rod
State Reference	OH
Altitude	msl bound lower : 26000 msl bound upper : 26300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other ground : parked
Route In Use	enroute : direct
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 14000 flight time type : 900
ASRS Report	307180
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : required legal separation non adherence : clearance
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented other
Consequence	Other
Miss Distance	vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

My flight departed detroit metropolitan for a flight to atlanta. We were given many intermediate altitudes on climb out due to crossing traffic. Upon reaching 26000 ft, the altitude knob of the autoplt was centered but the aircraft kept climbing at a very slow rate. At 26300 ft, I noticed the aircraft was still climbing and told the first officer to descend. Just after I brought this to the attention of the first officer, artc called and said we were 300 ft above altitude and to descend immediately. Air carrier traffic crossed at 27000 ft approximately 1 min after we were level at 26000 ft. I blame this incident on 3 factors, momentary lack of attention, poor instruments and autoplts and fatigue.

Original NASA ASRS Text

Title: ACR HAS ALTDEV, CLBING ABOVE ASSIGNED.

Narrative: MY FLT DEPARTED DETROIT METRO FOR A FLT TO ATLANTA. WE WERE GIVEN MANY INTERMEDIATE ALTS ON CLBOUT DUE TO XING TFC. UPON REACHING 26000 FT, THE ALT KNOB OF THE AUTOPLT WAS CTRED BUT THE ACFT KEPT CLBING AT A VERY SLOW RATE. AT 26300 FT, I NOTICED THE ACFT WAS STILL CLBING AND TOLD THE FO TO DSND. JUST AFTER I BROUGHT THIS TO THE ATTN OF THE FO, ARTC CALLED AND SAID WE WERE 300 FT ABOVE ALT AND TO DSND IMMEDIATELY. ACR TFC CROSSED AT 27000 FT APPROX 1 MIN AFTER WE WERE LEVEL AT 26000 FT. I BLAME THIS INCIDENT ON 3 FACTORS, MOMENTARY LACK OF ATTN, POOR INSTS AND AUTOPLTS AND FATIGUE.

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.