When widebody transport aircraft was taken off the autoplt to start a descent, aircraft pitched up abruptly and climbed until first officer flying was able to recover the aircraft and start descent.

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Attributes
ACN	165539
Time
Date	199012
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : orl
State Reference	FL
Altitude	msl bound lower : 25000 msl bound upper : 25450
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zjx tower : jfk
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 50 flight time total : 7000 flight time type : 150
ASRS Report	165539
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 9000 flight time type : 1000
ASRS Report	165540
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 : overcame equipment problem flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After being cleared out of 25000', descent was initiated on autoplt. Aircraft immediately pitched up. Because of light weight and speed, aircraft climbed at 2000 FPM. Autoplt was disengaged after 450' of climb at 2000-2500 FPM. Descent was initiated after approximately 900' of climb. I believe low time in aircraft contributed to my response time. Because of VMC conditions and good visibility abrupt control inputs.

Original NASA ASRS Text

Title: WHEN WDB ACFT WAS TAKEN OFF THE AUTOPLT TO START A DESCENT, ACFT PITCHED UP ABRUPTLY AND CLIMBED UNTIL FO FLYING WAS ABLE TO RECOVER THE ACFT AND START DESCENT.

Narrative: AFTER BEING CLRED OUT OF 25000', DSNT WAS INITIATED ON AUTOPLT. ACFT IMMEDIATELY PITCHED UP. BECAUSE OF LIGHT WT AND SPD, ACFT CLBED AT 2000 FPM. AUTOPLT WAS DISENGAGED AFTER 450' OF CLB AT 2000-2500 FPM. DSNT WAS INITIATED AFTER APPROX 900' OF CLB. I BELIEVE LOW TIME IN ACFT CONTRIBUTED TO MY RESPONSE TIME. BECAUSE OF VMC CONDITIONS AND GOOD VISIBILITY ABRUPT CTL INPUTS.

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.