An air carrier widebody transport frtr had a pitch up while flying on an autoplt.

Attributes
ACN	259397
Time
Date	199312
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : cyyr
State Reference	NF
Altitude	msl bound lower : 29000 msl bound upper : 29500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : czqm
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Route In Use	enroute : other oceanic enroute : atlantic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 170 flight time total : 12000
ASRS Report	259397
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 18500
ASRS Report	259395
Events
Anomaly	aircraft equipment problem : less severe altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
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:

'A' autoplt in command function with INS selected aircraft began a gradual roll to right. Autoplt was disconnected at 25 degrees bank and aircraft immediately pitched up sharply. Altitude went to 29500 and was immediately corrected back to 29000 ft. 'B' used for rest of flight. Operation normal. Suggest ground testing of autoplt system.

Original NASA ASRS Text

Title: AN ACR WDB FRTR HAD A PITCH UP WHILE FLYING ON AN AUTOPLT.

Narrative: 'A' AUTOPLT IN COMMAND FUNCTION WITH INS SELECTED ACFT BEGAN A GRADUAL ROLL TO R. AUTOPLT WAS DISCONNECTED AT 25 DEGS BANK AND ACFT IMMEDIATELY PITCHED UP SHARPLY. ALT WENT TO 29500 AND WAS IMMEDIATELY CORRECTED BACK TO 29000 FT. 'B' USED FOR REST OF FLT. OP NORMAL. SUGGEST GND TESTING OF AUTOPLT SYS.

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.