Flight crew experienced an autoplt pitch up and stick shaker.

Attributes
ACN	315594
Time
Date	199509
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 7000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 70 flight time total : 11500 flight time type : 4500
ASRS Report	315594
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly 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:

Autoplt attempted an uncommanded nose up at 7000 ft MSL approximately 10 DME northeast of dfw on modified base in 250 degree turn. Approximately 210 KTS idle power descent control column moved rapidly back within 1 to 3 inches back of full aft. The column came back so fast stick shaker activated and the aircraft shuddered approximately 1 second before the captain and myself simultaneously disconnected autoplt and pushed from approximately 20 degree nose up. Callback conversation with reporter revealed the following information: the reporter said the cause of the autoplt to pitch up was a short in the wiring to a 'flap logic' that occurs when the flaps are moved to the flaps 1 position. When the flaps were put in the #1 position, the nose pitched up to about 20 degrees so abruptly that the stick shaker actuated. Both pilots grabbed the wheel simultaneously, disconnected the autoplt, and pushed. There was a little less than the normal 1 positive G but no negative G's as they pushed. They also had a little bank which they rolled out of as they were in a left turn. There was no change in throttle position. He said that he learned about the 'flap logic' wire being 'frayed' from a conference call that occurred with the NTSB, NASA, FAA, company and union.

Original NASA ASRS Text

Title: FLC EXPERIENCED AN AUTOPLT PITCH UP AND STICK SHAKER.

Narrative: AUTOPLT ATTEMPTED AN UNCOMMANDED NOSE UP AT 7000 FT MSL APPROX 10 DME NE OF DFW ON MODIFIED BASE IN 250 DEG TURN. APPROX 210 KTS IDLE PWR DSCNT CTL COLUMN MOVED RAPIDLY BACK WITHIN 1 TO 3 INCHES BACK OF FULL AFT. THE COLUMN CAME BACK SO FAST STICK SHAKER ACTIVATED AND THE ACFT SHUDDERED APPROX 1 SECOND BEFORE THE CAPT AND MYSELF SIMULTANEOUSLY DISCONNECTED AUTOPLT AND PUSHED FROM APPROX 20 DEG NOSE UP. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THE CAUSE OF THE AUTOPLT TO PITCH UP WAS A SHORT IN THE WIRING TO A 'FLAP LOGIC' THAT OCCURS WHEN THE FLAPS ARE MOVED TO THE FLAPS 1 POS. WHEN THE FLAPS WERE PUT IN THE #1 POS, THE NOSE PITCHED UP TO ABOUT 20 DEGS SO ABRUPTLY THAT THE STICK SHAKER ACTUATED. BOTH PLTS GRABBED THE WHEEL SIMULTANEOUSLY, DISCONNECTED THE AUTOPLT, AND PUSHED. THERE WAS A LITTLE LESS THAN THE NORMAL 1 POSITIVE G BUT NO NEGATIVE G'S AS THEY PUSHED. THEY ALSO HAD A LITTLE BANK WHICH THEY ROLLED OUT OF AS THEY WERE IN A L TURN. THERE WAS NO CHANGE IN THROTTLE POS. HE SAID THAT HE LEARNED ABOUT THE 'FLAP LOGIC' WIRE BEING 'FRAYED' FROM A CONFERENCE CALL THAT OCCURRED WITH THE NTSB, NASA, FAA, COMPANY AND UNION.

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.