Narrative:

Shoreline 8 departure requires a right turn to heading 040 degrees shortly after takeoff to avoid terrain in the turn path. Briefed first officer (the PF) to start turn at 400 ft AGL but not much later to avoid mountain. Noted a left crosswind on takeoff and a rain shaft on the west departure end of runway 28R. First officer started turn at 150 ft RA and slowly rolled into a 25 degree bank. I elected not to intervene and the turn continued. At about heading 010 degrees encountered a mild windshear event which did not trigger the onboard detection equipment but did cause a slight jolt; the bank angle to increase to 35 degree degrees and the nose to drop as well and the airspeed to V2 -5 KTS. I; the captain and the PNF; called out 'bank angle' and as the PF was correcting; the stick shaker sounded for about 2 seconds. Continued turn to 040 degrees and rolled out at about an altitude of 1500-1800 ft. Continued the climb procedure and asked tower for a frequency change. Supplemental information from acn 689297: there was some confusion as to the captain's instructions to start the turn as soon as possible. At approximately 200 ft; I began the turn to the east. At approximately 010 degrees; we encountered a bump/shear which caused the bank to increase to approximately 35 degrees bank. The captain called out bank angle and I told him I was correcting. As I rolled wings level; the nose fell off to approximately 2 degrees anu. At that point; we got a momentary (2 second) stick shaker.

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Original NASA ASRS Text

Title: B747-300 FLT CREW DURING DEP ENCOUNTER MILD WINDSHEAR WHILE IN TURN. STALL WARNING (STICK SHAKER) ACTIVATES AND FLT CREW TAKES APPROPRIATE ACTION TO RECOVER.

Narrative: SHORELINE 8 DEP REQUIRES A R TURN TO HDG 040 DEGS SHORTLY AFTER TKOF TO AVOID TERRAIN IN THE TURN PATH. BRIEFED FO (THE PF) TO START TURN AT 400 FT AGL BUT NOT MUCH LATER TO AVOID MOUNTAIN. NOTED A L XWIND ON TKOF AND A RAIN SHAFT ON THE W DEP END OF RWY 28R. FO STARTED TURN AT 150 FT RA AND SLOWLY ROLLED INTO A 25 DEG BANK. I ELECTED NOT TO INTERVENE AND THE TURN CONTINUED. AT ABOUT HDG 010 DEGS ENCOUNTERED A MILD WINDSHEAR EVENT WHICH DID NOT TRIGGER THE ONBOARD DETECTION EQUIP BUT DID CAUSE A SLIGHT JOLT; THE BANK ANGLE TO INCREASE TO 35 DEG DEGS AND THE NOSE TO DROP AS WELL AND THE AIRSPD TO V2 -5 KTS. I; THE CAPT AND THE PNF; CALLED OUT 'BANK ANGLE' AND AS THE PF WAS CORRECTING; THE STICK SHAKER SOUNDED FOR ABOUT 2 SECONDS. CONTINUED TURN TO 040 DEGS AND ROLLED OUT AT ABOUT AN ALT OF 1500-1800 FT. CONTINUED THE CLB PROC AND ASKED TWR FOR A FREQ CHANGE. SUPPLEMENTAL INFO FROM ACN 689297: THERE WAS SOME CONFUSION AS TO THE CAPT'S INSTRUCTIONS TO START THE TURN ASAP. AT APPROX 200 FT; I BEGAN THE TURN TO THE E. AT APPROX 010 DEGS; WE ENCOUNTERED A BUMP/SHEAR WHICH CAUSED THE BANK TO INCREASE TO APPROX 35 DEGS BANK. THE CAPT CALLED OUT BANK ANGLE AND I TOLD HIM I WAS CORRECTING. AS I ROLLED WINGS LEVEL; THE NOSE FELL OFF TO APPROX 2 DEGS ANU. AT THAT POINT; WE GOT A MOMENTARY (2 SECOND) STICK SHAKER.

Data retrieved from NASA's ASRS site as of January 2009 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.