False stall warning on takeoff results in deviation from clearance route heading.

Attributes
ACN	120869
Time
Date	198908
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : lax
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : lax
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 160 flight time total : 3500 flight time type : 1100
ASRS Report	120869
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical non adherence : clearance other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	aircraft : equipment problem dissipated controller : issued new clearance flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

During latter portion of takeoff rotation (airspeed approximately 155 KIAS) the stall warning system activated. Aircraft performance appeared normal so the captain began to recycle the system. First officer started a right turn to VFR downwind to return for landing. When the stall warning system was turned off then reset all operations appeared normal and captain decided to continue the flight. Departure control called and reissued a wbound departure vector. We complied and when asked about our turn out of departure instructions we advised the controller of our problem on takeoff and that it was now under control and no emergency action needed to be taken.

Original NASA ASRS Text

Title: FALSE STALL WARNING ON TKOF RESULTS IN DEVIATION FROM CLRNC ROUTE HEADING.

Narrative: DURING LATTER PORTION OF TKOF ROTATION (AIRSPEED APPROX 155 KIAS) THE STALL WARNING SYSTEM ACTIVATED. ACFT PERFORMANCE APPEARED NORMAL SO THE CAPT BEGAN TO RECYCLE THE SYSTEM. F/O STARTED A RIGHT TURN TO VFR DOWNWIND TO RETURN FOR LNDG. WHEN THE STALL WARNING SYSTEM WAS TURNED OFF THEN RESET ALL OPERATIONS APPEARED NORMAL AND CAPT DECIDED TO CONTINUE THE FLT. DEP CTL CALLED AND REISSUED A WBOUND DEP VECTOR. WE COMPLIED AND WHEN ASKED ABOUT OUR TURN OUT OF DEP INSTRUCTIONS WE ADVISED THE CTLR OF OUR PROBLEM ON TKOF AND THAT IT WAS NOW UNDER CONTROL AND NO EMER ACTION NEEDED TO BE TAKEN.

Data retrieved from NASA's ASRS site as of August 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.