Narrative:

During taxi out and wait for takeoff; we listened to numerous aircraft departing runway 19R at sna report a loss of airspeed on departure at about 1000 ft. The surface winds were reported at 230 degrees at 10 KTS as we took the runway. We still planned to fly the musel 6 noise abatement profile out of sna with the expectation that we may have to abandon it due to an airspeed loss. We were a light airplane with only about 85 passenger and a takeoff gross of 174000 pounds. We were given takeoff clearance at XA23Z. The takeoff roll and initial climb were normal; but at 700 ft we had a rapid airspeed loss of 20-25 KTS and an onboard windshear warning. I immediately lowered the nose to 15 degrees; and we still had maximum takeoff thrust; so I did not firewall the thrust; but I did not call for VNAV as we passed 800 ft as is called for on the noise abatement profile for orange county. The airspeed loss was only momentary; as by 1000 ft the winds were stable from the north at about 35 KTS. I called for VNAV and flew the remainder of the departure uneventfully. We made a report to the tower that we had the airspeed loss. By delaying our power reduction due to the windshear; we may or may not have set off the noise monitors on the departure end of runway 19R.

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Original NASA ASRS Text

Title: B757 FLT CREW ENCOUNTERS WINDSHEAR INDUCED LOSS OF INDICATED AIRSPD ON DEP FROM SNA. FEAR THEY MAY HAVE SET OFF NOISE MONITORS.

Narrative: DURING TAXI OUT AND WAIT FOR TKOF; WE LISTENED TO NUMEROUS ACFT DEPARTING RWY 19R AT SNA RPT A LOSS OF AIRSPD ON DEP AT ABOUT 1000 FT. THE SURFACE WINDS WERE RPTED AT 230 DEGS AT 10 KTS AS WE TOOK THE RWY. WE STILL PLANNED TO FLY THE MUSEL 6 NOISE ABATEMENT PROFILE OUT OF SNA WITH THE EXPECTATION THAT WE MAY HAVE TO ABANDON IT DUE TO AN AIRSPD LOSS. WE WERE A LIGHT AIRPLANE WITH ONLY ABOUT 85 PAX AND A TKOF GROSS OF 174000 LBS. WE WERE GIVEN TKOF CLRNC AT XA23Z. THE TKOF ROLL AND INITIAL CLB WERE NORMAL; BUT AT 700 FT WE HAD A RAPID AIRSPD LOSS OF 20-25 KTS AND AN ONBOARD WINDSHEAR WARNING. I IMMEDIATELY LOWERED THE NOSE TO 15 DEGS; AND WE STILL HAD MAX TKOF THRUST; SO I DID NOT FIREWALL THE THRUST; BUT I DID NOT CALL FOR VNAV AS WE PASSED 800 FT AS IS CALLED FOR ON THE NOISE ABATEMENT PROFILE FOR ORANGE COUNTY. THE AIRSPD LOSS WAS ONLY MOMENTARY; AS BY 1000 FT THE WINDS WERE STABLE FROM THE N AT ABOUT 35 KTS. I CALLED FOR VNAV AND FLEW THE REMAINDER OF THE DEP UNEVENTFULLY. WE MADE A RPT TO THE TWR THAT WE HAD THE AIRSPD LOSS. BY DELAYING OUR PWR REDUCTION DUE TO THE WINDSHEAR; WE MAY OR MAY NOT HAVE SET OFF THE NOISE MONITORS ON THE DEP END OF RWY 19R.

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.