Narrative:

On missed approach at fat, told to climb to 3000' on heading 120 degrees for vectors to lax. After retracting flaps and leading edge devices as ordered by captain who was flying, the aircraft began buffeting heavily with an airspeed of 240 KTS approximately. This coincided with leveling off at 3000'. All 'transit' or 'extended' lights were not illuminated. Speed brakes were not deployed (handle was stowed). Landing gear lights were not illuminated. All engine instruments were normal. Captain elected to start a climb to put some altitude between us and the ground. I advised departure control that we needed to climb immediately. The controller told us to maintain 3000'. We were VMC (on top of ground fog layer on deck) and could see traffic at our 12 O'clock and 1 O'clock. I declared emergency as advised by captain and told departure control we were climbing. This occurred passing through 3300'. At 3800' departure control told us to maintain 4000' and advised us of traffic at 12 O'clock and 5000' descending. He told us to make an immediate right turn which the captain did. After approximately 15 seconds in right turn the leading edge transit amber light flickered on and off and buffeting ceased immediately. We advised departure control that we believed the problem no longer existed and was cleared to higher altitude on our way to lax by them. We had the commuter traffic (advised earlier by departure control) at all times in sight while deviating from the assigned altitude of 3000'.

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Original NASA ASRS Text

Title: ON MISSED APCH ACR MLG DECLARED AN EMERGENCY AND CONTINUED CLIMB MAINTAINING VISUAL SEPARATION FROM INBOUND ACFT. ACFT VIBRATION FROM UNKNOWN CAUSE INFLUENCED PIC TO CLIMB.

Narrative: ON MISSED APCH AT FAT, TOLD TO CLB TO 3000' ON HDG 120 DEGS FOR VECTORS TO LAX. AFTER RETRACTING FLAPS AND LEADING EDGE DEVICES AS ORDERED BY CAPT WHO WAS FLYING, THE ACFT BEGAN BUFFETING HEAVILY WITH AN AIRSPD OF 240 KTS APPROX. THIS COINCIDED WITH LEVELING OFF AT 3000'. ALL 'TRANSIT' OR 'EXTENDED' LIGHTS WERE NOT ILLUMINATED. SPEED BRAKES WERE NOT DEPLOYED (HANDLE WAS STOWED). LNDG GEAR LIGHTS WERE NOT ILLUMINATED. ALL ENG INSTRUMENTS WERE NORMAL. CAPT ELECTED TO START A CLB TO PUT SOME ALT BTWN US AND THE GND. I ADVISED DEP CTL THAT WE NEEDED TO CLB IMMEDIATELY. THE CTLR TOLD US TO MAINTAIN 3000'. WE WERE VMC (ON TOP OF GND FOG LAYER ON DECK) AND COULD SEE TFC AT OUR 12 O'CLOCK AND 1 O'CLOCK. I DECLARED EMER AS ADVISED BY CAPT AND TOLD DEP CTL WE WERE CLBING. THIS OCCURRED PASSING THROUGH 3300'. AT 3800' DEP CTL TOLD US TO MAINTAIN 4000' AND ADVISED US OF TFC AT 12 O'CLOCK AND 5000' DSNDING. HE TOLD US TO MAKE AN IMMEDIATE RIGHT TURN WHICH THE CAPT DID. AFTER APPROX 15 SECS IN RIGHT TURN THE LEADING EDGE TRANSIT AMBER LIGHT FLICKERED ON AND OFF AND BUFFETING CEASED IMMEDIATELY. WE ADVISED DEP CTL THAT WE BELIEVED THE PROB NO LONGER EXISTED AND WAS CLRED TO HIGHER ALT ON OUR WAY TO LAX BY THEM. WE HAD THE COMMUTER TFC (ADVISED EARLIER BY DEP CTL) AT ALL TIMES IN SIGHT WHILE DEVIATING FROM THE ASSIGNED ALT OF 3000'.

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.