Altitude deviation.

Attributes
ACN	305170
Time
Date	199505
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : irk
State Reference	MO
Altitude	msl bound lower : 33000 msl bound upper : 33300
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc
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	305170
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
ASRS Report	305171
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : became reoriented flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation other

Narrative:

While en route abq-ord at FL330, irk 240 degree radial, 150 DME, approximately XA00Z in pms performance cruise mode, altitude started to climb rapidly. Autoplt disengaged by pilot 100 ft above FL330. Leveloff initiated with autoplt off. Climb stopped by FL333. Aircraft returned to FL330 and flight continued in non performance mode with no additional flight guidance problems.

Original NASA ASRS Text

Title: ALTDEV.

Narrative: WHILE ENRTE ABQ-ORD AT FL330, IRK 240 DEG RADIAL, 150 DME, APPROX XA00Z IN PMS PERFORMANCE CRUISE MODE, ALT STARTED TO CLB RAPIDLY. AUTOPLT DISENGAGED BY PLT 100 FT ABOVE FL330. LEVELOFF INITIATED WITH AUTOPLT OFF. CLB STOPPED BY FL333. ACFT RETURNED TO FL330 AND FLT CONTINUED IN NON PERFORMANCE MODE WITH NO ADDITIONAL FLT GUIDANCE PROBS.

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.