Flight crew has stabilizer equipment problem. Disengaged autoplt, violent pitch up, altitude deviati...

Attributes
ACN	152069
Time
Date	199007
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : bhm
State Reference	AL
Altitude	msl bound lower : 19000 msl bound upper : 19300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 65 flight time total : 11090 flight time type : 8030
ASRS Report	152069
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp 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 : regained aircraft control flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 15000 vertical : 700
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

Departed atl for jackson, mi. Under the control of ZTL at approximately pm det, approximately 30 mi southeast of birmingham, in intermediate level off was given at FL190 due to traffic at FL200. We leveled our aircraft at FL190 with the autoplt on altitude hold. We allowed the aircraft to accelerate to about 360 KIAS when the 'stabilizer out of trim' light illuminated. The first officer, flying the large transport, disengaged the autoplt. The aircraft violently pitched up gaining approximately 300' before the first officer could push the nose over to return to FL190. The autoplt was switched from 'a' mode to 'B' mode, reengaged, and operated normally for the remainder of the flight. Even though the first officer had a secure hold on the yoke and anticipated a pitch up, it was stronger than he could immediately control.

Original NASA ASRS Text

Title: FLT CREW HAS STABILIZER EQUIPMENT PROBLEM. DISENGAGED AUTOPLT, VIOLENT PITCH UP, ALT DEVIATION.

Narrative: DEPARTED ATL FOR JACKSON, MI. UNDER THE CTL OF ZTL AT APPROX PM DET, APPROX 30 MI SE OF BIRMINGHAM, IN INTERMEDIATE LEVEL OFF WAS GIVEN AT FL190 DUE TO TFC AT FL200. WE LEVELED OUR ACFT AT FL190 WITH THE AUTOPLT ON ALT HOLD. WE ALLOWED THE ACFT TO ACCELERATE TO ABOUT 360 KIAS WHEN THE 'STAB OUT OF TRIM' LIGHT ILLUMINATED. THE F/O, FLYING THE LGT, DISENGAGED THE AUTOPLT. THE ACFT VIOLENTLY PITCHED UP GAINING APPROX 300' BEFORE THE F/O COULD PUSH THE NOSE OVER TO RETURN TO FL190. THE AUTOPLT WAS SWITCHED FROM 'A' MODE TO 'B' MODE, REENGAGED, AND OPERATED NORMALLY FOR THE REMAINDER OF THE FLT. EVEN THOUGH THE F/O HAD A SECURE HOLD ON THE YOKE AND ANTICIPATED A PITCH UP, IT WAS STRONGER THAN HE COULD IMMEDIATELY CTL.

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.

Flight crew has stabilizer equipment problem. Disengaged autoplt, violent pitch up, altitude deviation.