Narrative:

Directed to cross benky at 11000 ft by ord approach control. Left FL240 with 10 KT tailwind as calculated by performance monitoring system. It became apparent that maximum effort would be needed to meet restr. Extended speed brakes and increased speed to 340 KTS at idle power but still crossed benky about 800 ft high. After leveloff performance monitoring system showed tailwind had increased to 32 KTS. Need to be aware that winds will affect clearance requirements.

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Original NASA ASRS Text

Title: MD80 DSNDED WITH VNAV PROGRAMMED TO MAKE A XING ALT. ACFT FAILED TO MAKE THE XING ALT.

Narrative: DIRECTED TO CROSS BENKY AT 11000 FT BY ORD APCH CTL. LEFT FL240 WITH 10 KT TAILWIND AS CALCULATED BY PERFORMANCE MONITORING SYS. IT BECAME APPARENT THAT MAX EFFORT WOULD BE NEEDED TO MEET RESTR. EXTENDED SPD BRAKES AND INCREASED SPD TO 340 KTS AT IDLE PWR BUT STILL CROSSED BENKY ABOUT 800 FT HIGH. AFTER LEVELOFF PERFORMANCE MONITORING SYS SHOWED TAILWIND HAD INCREASED TO 32 KTS. NEED TO BE AWARE THAT WINDS WILL AFFECT CLRNC REQUIREMENTS.

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.