Narrative:

Upon boarding the aircraft at ontario, the gate agent noticed that the jetway appeared to be mis-parked. The exterior preflight was accomplished immediately, and the left angle of attack vane was found to be damaged. At this time, calls were made to our dispatcher, our maintenance coordination, and contract maintenance personnel. Because the aoa vane was very loosely attached, it was removed by maintenance as a FOD precaution. Our maintenance coordination then sent us a teletype dispatch authorization to defer the left stall warning system. This was entered in the log book and a successful test of the right stall warning system was accomplished. (This message contained no reference to circuit breakers.) a hand written placard was installed on the affected system, and the flight was pushed back with min delay. On takeoff from ontario, the left stick shaker activated at liftoff, and remained on until landing. The decision was made to return to ontario, and a normal approach and landing was accomplished. Upon arrival at the gate, flight control and the maintenance coordination were again notified. They sent a second message to defer the left stall warning system, which included pulling the appropriate circuit breakers. The crew feels that we followed the instrument of both maintenance messages to the letter. A second takeoff was made, and no stall warning indications occurred. The flight then continued uneventfully to the destination airport.

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Original NASA ASRS Text

Title: ACR DEPARTS AFTER L ANGLE OF ATTACK VANE REMOVED DUE TO DAMAGE. LOG BOOKS SIGNED. DISPATCH SENDS AUTHORIZATION TO FLY.

Narrative: UPON BOARDING THE ACFT AT ONTARIO, THE GATE AGENT NOTICED THAT THE JETWAY APPEARED TO BE MIS-PARKED. THE EXTERIOR PREFLT WAS ACCOMPLISHED IMMEDIATELY, AND THE L ANGLE OF ATTACK VANE WAS FOUND TO BE DAMAGED. AT THIS TIME, CALLS WERE MADE TO OUR DISPATCHER, OUR MAINT COORD, AND CONTRACT MAINT PERSONNEL. BECAUSE THE AOA VANE WAS VERY LOOSELY ATTACHED, IT WAS REMOVED BY MAINT AS A FOD PRECAUTION. OUR MAINT COORD THEN SENT US A TELETYPE DISPATCH AUTHORIZATION TO DEFER THE L STALL WARNING SYS. THIS WAS ENTERED IN THE LOG BOOK AND A SUCCESSFUL TEST OF THE R STALL WARNING SYS WAS ACCOMPLISHED. (THIS MESSAGE CONTAINED NO REF TO CIRCUIT BREAKERS.) A HAND WRITTEN PLACARD WAS INSTALLED ON THE AFFECTED SYS, AND THE FLT WAS PUSHED BACK WITH MIN DELAY. ON TKOF FROM ONTARIO, THE L STICK SHAKER ACTIVATED AT LIFTOFF, AND REMAINED ON UNTIL LNDG. THE DECISION WAS MADE TO RETURN TO ONTARIO, AND A NORMAL APCH AND LNDG WAS ACCOMPLISHED. UPON ARR AT THE GATE, FLT CTL AND THE MAINT COORD WERE AGAIN NOTIFIED. THEY SENT A SECOND MESSAGE TO DEFER THE L STALL WARNING SYS, WHICH INCLUDED PULLING THE APPROPRIATE CIRCUIT BREAKERS. THE CREW FEELS THAT WE FOLLOWED THE INST OF BOTH MAINT MESSAGES TO THE LETTER. A SECOND TKOF WAS MADE, AND NO STALL WARNING INDICATIONS OCCURRED. THE FLT THEN CONTINUED UNEVENTFULLY TO THE DEST ARPT.

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.