Narrative:

DC10-30, near gross, for runway. Optimum flaps for takeoff (10.5 degrees) and maximum thrust. ATIS reported windshear on final and reports of severe turbulence below 6000 ft. Ground conditions at the time were light to occasional moderate rain squalls with fast-moving clouds. Movement surfaces, including runway, were wet. Power was run up and stabilized before takeoff. Long takeoff roll with two very small hesitations in airspeed increase. Aircraft did not rotate or climb enthusiastically due to weight, wind, and shallow flap setting. This is a noise abatement departure (lawbourne 3M). Power reduction to climb thrust at 1500 ft AGL, then climb to 3000 ft AGL, before retracting flaps. At 2.3 DME, right turn was initiated, speed was increasing above V2 + 10 KTS, but climb performance was poor, windy, and rough. Flaps retracted to 1 degrees (takeoff slats) captain was reducing and then increasing power due to fluctuating airspeed. Rough ride. At about 2500 ft MSL, speed and climb increased significantly. Speed warning and altitude horn (for intermediate altitude leveloff at 3000 ft MSL) near idle thrust, autothrottles off. Apparent strong updraft/windshear. Reversed climb rate at about approximately 3400 ft, speed about 290 KTS. Slowed and retracted takeoff slats. Continued climb at departure control request on radar heading. Altitude excursion caused by unreasonable requirement to comply with noise abatement SID under very poor flying conditions.

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Original NASA ASRS Text

Title: THE FO OF A DC10-30, DURING DEP FROM GATWICK, EXPERIENCED AN ALT EXCURSION AND ATTRIBUTED IT TO AN 'UNREASONABLE' NOISE ABATEMENT PROC.

Narrative: DC10-30, NEAR GROSS, FOR RWY. OPTIMUM FLAPS FOR TKOF (10.5 DEGS) AND MAX THRUST. ATIS RPTED WINDSHEAR ON FINAL AND RPTS OF SEVERE TURB BELOW 6000 FT. GND CONDITIONS AT THE TIME WERE LIGHT TO OCCASIONAL MODERATE RAIN SQUALLS WITH FAST-MOVING CLOUDS. MOVEMENT SURFACES, INCLUDING RWY, WERE WET. PWR WAS RUN UP AND STABILIZED BEFORE TKOF. LONG TKOF ROLL WITH TWO VERY SMALL HESITATIONS IN AIRSPD INCREASE. ACFT DID NOT ROTATE OR CLB ENTHUSIASTICALLY DUE TO WT, WIND, AND SHALLOW FLAP SETTING. THIS IS A NOISE ABATEMENT DEP (LAWBOURNE 3M). PWR REDUCTION TO CLB THRUST AT 1500 FT AGL, THEN CLB TO 3000 FT AGL, BEFORE RETRACTING FLAPS. AT 2.3 DME, R TURN WAS INITIATED, SPD WAS INCREASING ABOVE V2 + 10 KTS, BUT CLB PERFORMANCE WAS POOR, WINDY, AND ROUGH. FLAPS RETRACTED TO 1 DEGS (TKOF SLATS) CAPT WAS REDUCING AND THEN INCREASING PWR DUE TO FLUCTUATING AIRSPD. ROUGH RIDE. AT ABOUT 2500 FT MSL, SPD AND CLB INCREASED SIGNIFICANTLY. SPD WARNING AND ALT HORN (FOR INTERMEDIATE ALT LEVELOFF AT 3000 FT MSL) NEAR IDLE THRUST, AUTOTHROTTLES OFF. APPARENT STRONG UPDRAFT/WINDSHEAR. REVERSED CLB RATE AT ABOUT APPROX 3400 FT, SPD ABOUT 290 KTS. SLOWED AND RETRACTED TKOF SLATS. CONTINUED CLB AT DEP CTL REQUEST ON RADAR HEADING. ALT EXCURSION CAUSED BY UNREASONABLE REQUIREMENT TO COMPLY WITH NOISE ABATEMENT SID UNDER VERY POOR FLYING CONDITIONS.

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.