An air carrier MD80 flight crew climbed above their interim assigned altitude when the captain forgot to set in the altitude and the first officer changed to performance mode.

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Attributes
ACN	368800
Time
Date	199705
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mva
State Reference	NV
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zlc tower : cle
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	368800
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence : clearance non adherence : far non adherence : published procedure
Independent Detector	other controllera 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:

In a climb to FL330 ATC told us to stop at FL310. We did, but I forgot to change the altitude window to FL310. Then I started a PA and the first officer pushed the performance cruise. I guess there was a small climb at that time because we did not notice that the aircraft was in a small climb until ATC asked us what our altitude was. The first officer immediately returned to FL310 and an apology was made to ATC. This was my fault for not putting FL310 in window and not monitoring things during a PA.

Original NASA ASRS Text

Title: AN ACR MD80 FLC CLBED ABOVE THEIR INTERIM ASSIGNED ALT WHEN THE CAPT FORGOT TO SET IN THE ALT AND THE FO CHANGED TO PERFORMANCE MODE.

Narrative: IN A CLB TO FL330 ATC TOLD US TO STOP AT FL310. WE DID, BUT I FORGOT TO CHANGE THE ALT WINDOW TO FL310. THEN I STARTED A PA AND THE FO PUSHED THE PERFORMANCE CRUISE. I GUESS THERE WAS A SMALL CLB AT THAT TIME BECAUSE WE DID NOT NOTICE THAT THE ACFT WAS IN A SMALL CLB UNTIL ATC ASKED US WHAT OUR ALT WAS. THE FO IMMEDIATELY RETURNED TO FL310 AND AN APOLOGY WAS MADE TO ATC. THIS WAS MY FAULT FOR NOT PUTTING FL310 IN WINDOW AND NOT MONITORING THINGS DURING A PA.

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.