Aborted takeoff due to improper flap setting.

Attributes
ACN	146156
Time
Date	199005
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : takeoff other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 12000
ASRS Report	146156
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Left gate with takeoff data calculated for runway 31L departure, ground control instructed taxi to runway 22L. Accepted runway 22L and recalculated performance data for runway 22L which required a different flap setting. On takeoff with advancement of throttles got takeoff warning horn and rejected takeoff at slow speed. Upon exiting runway discovered that flap/cg thumbwheels for stabilizer were incorrectly set for flap 15 takeoff instead of the revised flap 19 takeoff. Corrected setting and returned to runway. Took off and all system normal. Situation occurred due to last min change in runway which required a change in confign, taxi checklist was run after setting new flap setting, but taxi checklist does not call for checking and resetting flap/cg thumbwheels. I am just recently qualified in medium large transport aircraft and have little experience with a variable green takeoff band so old habit patterns do not apply and can lead to problems. The increased automation required more attention and time and often is difficult to accomplish with last min changes, such as a last min runway change. I would suggest that taxi checklist be revised to included not only flap position but that flap setting in cg commuter also be included with that item.

Original NASA ASRS Text

Title: ABORTED TKOF DUE TO IMPROPER FLAP SETTING.

Narrative: LEFT GATE WITH TKOF DATA CALCULATED FOR RWY 31L DEP, GND CTL INSTRUCTED TAXI TO RWY 22L. ACCEPTED RWY 22L AND RECALCULATED PERFORMANCE DATA FOR RWY 22L WHICH REQUIRED A DIFFERENT FLAP SETTING. ON TKOF WITH ADVANCEMENT OF THROTTLES GOT TKOF WARNING HORN AND REJECTED TKOF AT SLOW SPD. UPON EXITING RWY DISCOVERED THAT FLAP/CG THUMBWHEELS FOR STABILIZER WERE INCORRECTLY SET FOR FLAP 15 TKOF INSTEAD OF THE REVISED FLAP 19 TKOF. CORRECTED SETTING AND RETURNED TO RWY. TOOK OFF AND ALL SYS NORMAL. SITUATION OCCURRED DUE TO LAST MIN CHANGE IN RWY WHICH REQUIRED A CHANGE IN CONFIGN, TAXI CHKLIST WAS RUN AFTER SETTING NEW FLAP SETTING, BUT TAXI CHKLIST DOES NOT CALL FOR CHKING AND RESETTING FLAP/CG THUMBWHEELS. I AM JUST RECENTLY QUALIFIED IN MLG ACFT AND HAVE LITTLE EXPERIENCE WITH A VARIABLE GREEN TKOF BAND SO OLD HABIT PATTERNS DO NOT APPLY AND CAN LEAD TO PROBS. THE INCREASED AUTOMATION REQUIRED MORE ATTN AND TIME AND OFTEN IS DIFFICULT TO ACCOMPLISH WITH LAST MIN CHANGES, SUCH AS A LAST MIN RWY CHANGE. I WOULD SUGGEST THAT TAXI CHKLIST BE REVISED TO INCLUDED NOT ONLY FLAP POS BUT THAT FLAP SETTING IN CG COMMUTER ALSO BE INCLUDED WITH THAT ITEM.

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.