Altitude deviation.

Attributes
ACN	293640
Time
Date	199501
Day	Sun
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : txo
State Reference	TX
Altitude	msl bound lower : 35000 msl bound upper : 35300
Aircraft 1
Controlling Facilities	artcc : zab
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other 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	293640
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	293641
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
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While level at FL350, in abq airspace, 50 NM west txo VOR, the autoplt began an uncommanded climb. The deviation was arrested at FL353.

Original NASA ASRS Text

Title: ALTDEV.

Narrative: WHILE LEVEL AT FL350, IN ABQ AIRSPACE, 50 NM W TXO VOR, THE AUTOPLT BEGAN AN UNCOMMANDED CLB. THE DEV WAS ARRESTED AT FL353.

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.