On takeoff roll, takeoff warning horn sounded. Flaps lowered for normal takeoff.

Attributes
ACN	146166
Time
Date	199005
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 75 flight time total : 4000 flight time type : 1200
ASRS Report	146166
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While taxiing for takeoff at bos, we were doing the checklist. At the point where we needed the weight and balance figures, I called the company to get them. We continued the checklist until they came over the ACARS, at which point I entered them into the computer. Then we continued the checklist. At the end of the runway, I did a scan of the items that are set for takeoff including the flaps and spoilers. When we were cleared for takeoff, I brought the power up slowly and as I did, the warning horn sounded. I stopped the advance of the throttles and the captain checked the spoilers and the flaps. He found that the flaps were not in the takeoff position. He lowered the flaps and we continued the takeoff. The F/as in the back did not realize anything was out of the ordinary as the power was brought up so slowly, they thought that we were taxiing. The rest of the takeoff was uneventful. What was a factor in the overlooking of the flaps is that when I checked them, I just put my hand on the flap handle and did not check the indicator. The captain also saw me do the check as we talked about it later. What I need to do in the future is to check the indicator and not just the handle as it is easy to think it is in a certain position and it is not.

Original NASA ASRS Text

Title: ON TKOF ROLL, TKOF WARNING HORN SOUNDED. FLAPS LOWERED FOR NORMAL TKOF.

Narrative: WHILE TAXIING FOR TKOF AT BOS, WE WERE DOING THE CHKLIST. AT THE POINT WHERE WE NEEDED THE WT AND BALANCE FIGURES, I CALLED THE COMPANY TO GET THEM. WE CONTINUED THE CHKLIST UNTIL THEY CAME OVER THE ACARS, AT WHICH POINT I ENTERED THEM INTO THE COMPUTER. THEN WE CONTINUED THE CHKLIST. AT THE END OF THE RWY, I DID A SCAN OF THE ITEMS THAT ARE SET FOR TKOF INCLUDING THE FLAPS AND SPOILERS. WHEN WE WERE CLRED FOR TKOF, I BROUGHT THE PWR UP SLOWLY AND AS I DID, THE WARNING HORN SOUNDED. I STOPPED THE ADVANCE OF THE THROTTLES AND THE CAPT CHKED THE SPOILERS AND THE FLAPS. HE FOUND THAT THE FLAPS WERE NOT IN THE TKOF POS. HE LOWERED THE FLAPS AND WE CONTINUED THE TKOF. THE F/AS IN THE BACK DID NOT REALIZE ANYTHING WAS OUT OF THE ORDINARY AS THE PWR WAS BROUGHT UP SO SLOWLY, THEY THOUGHT THAT WE WERE TAXIING. THE REST OF THE TKOF WAS UNEVENTFUL. WHAT WAS A FACTOR IN THE OVERLOOKING OF THE FLAPS IS THAT WHEN I CHKED THEM, I JUST PUT MY HAND ON THE FLAP HANDLE AND DID NOT CHK THE INDICATOR. THE CAPT ALSO SAW ME DO THE CHK AS WE TALKED ABOUT IT LATER. WHAT I NEED TO DO IN THE FUTURE IS TO CHK THE INDICATOR AND NOT JUST THE HANDLE AS IT IS EASY TO THINK IT IS IN A CERTAIN POS AND IT IS NOT.

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.