Flight crew deviated from assigned altitude while trying to program autoplt for a descent.

Attributes
ACN	306860
Time
Date	199506
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ord
State Reference	IL
Altitude	msl bound lower : 11000 msl bound upper : 11300
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Fokker 100
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	306860
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe 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 flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Altitude deviation. Flight X was flying at 11000 ft on autoplt and assigned to 10000 ft. 10000 ft was entered into the altitude select window and verified in accordance with company procedures. The altitude knob was pulled to initiate a level change altitude change. The aircraft began a climb and I initiated a correction to begin a descent. Aircraft peaked at 11300 ft. Aircraft descended to 10000 ft without further deviation for the remainder of the flight.

Original NASA ASRS Text

Title: FLC DEVIATED FROM ASSIGNED ALT WHILE TRYING TO PROGRAM AUTOPLT FOR A DSCNT.

Narrative: ALTDEV. FLT X WAS FLYING AT 11000 FT ON AUTOPLT AND ASSIGNED TO 10000 FT. 10000 FT WAS ENTERED INTO THE ALT SELECT WINDOW AND VERIFIED IN ACCORDANCE WITH COMPANY PROCS. THE ALT KNOB WAS PULLED TO INITIATE A LEVEL CHANGE ALT CHANGE. THE ACFT BEGAN A CLB AND I INITIATED A CORRECTION TO BEGIN A DSCNT. ACFT PEAKED AT 11300 FT. ACFT DSNDED TO 10000 FT WITHOUT FURTHER DEV FOR THE REMAINDER OF THE FLT.

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.