Narrative:

During taxi for takeoff, wind conditions made runway change necessary. The equipment cooling fan on this particular aircraft is very noisy, making communication in the aircraft very difficult. Captain asked copilot to, 'check the # for the new runway,' and believed he heard, '#south checked,' when in fact, new V speeds were not set. A normal takeoff was made, but during later discussion it was determined that incorrect takeoff data was probably used. The equipment cooling fan on various models of this type aircraft is loud enough to effect the communication process. Because of this problem the circuit breaker is very frequently pulled, and in fact, had been pulled on this aircraft prior ot this flight. If this problem applied to all this type aircraft, crews would be alert and adapt, but with only a few aircraft involved, there is no adaptation.

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Original NASA ASRS Text

Title: ACR MLG USED WRONG V SPEEDS FOR TKOF FROM ICT.

Narrative: DURING TAXI FOR TKOF, WIND CONDITIONS MADE RWY CHANGE NECESSARY. THE EQUIP COOLING FAN ON THIS PARTICULAR ACFT IS VERY NOISY, MAKING COM IN THE ACFT VERY DIFFICULT. CAPT ASKED COPLT TO, 'CHK THE # FOR THE NEW RWY,' AND BELIEVED HE HEARD, '#S CHKED,' WHEN IN FACT, NEW V SPDS WERE NOT SET. A NORMAL TKOF WAS MADE, BUT DURING LATER DISCUSSION IT WAS DETERMINED THAT INCORRECT TKOF DATA WAS PROBABLY USED. THE EQUIP COOLING FAN ON VARIOUS MODELS OF THIS TYPE ACFT IS LOUD ENOUGH TO EFFECT THE COM PROCESS. BECAUSE OF THIS PROB THE CB IS VERY FREQUENTLY PULLED, AND IN FACT, HAD BEEN PULLED ON THIS ACFT PRIOR OT THIS FLT. IF THIS PROB APPLIED TO ALL THIS TYPE ACFT, CREWS WOULD BE ALERT AND ADAPT, BUT WITH ONLY A FEW ACFT INVOLVED, THERE IS NO ADAPTATION.

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.