Change of aircraft, flight crew did not recognize differences in flap settings. Takeoff aborted.

Attributes
ACN	260725
Time
Date	199401
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : las
State Reference	NV
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
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 : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 7000 flight time type : 4000
ASRS Report	260725
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : rejected takeoff other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Flight aborted takeoff roll for unsafe confign warning. We had just had an unscheduled aircraft change from a 300 model to a 500 model. The minimum flap setting for takeoff in a -500 is flaps 5 degrees. In our haste to get underway, we did not pick up that we were in a -500 since both cockpits are identical. When the first officer filled out the takeoff data sheet he wrote '1' under flap setting. I called for flaps 1 on taxi out. During takeoff we got a warning horn, aborted, cleared the runway, reset the flaps and taxied back for takeoff. I have since instituted several checks to ensure this mistake will not be repeated.

Original NASA ASRS Text

Title: CHANGE OF ACFT, FLC DID NOT RECOGNIZE DIFFERENCES IN FLAP SETTINGS. TKOF ABORTED.

Narrative: FLT ABORTED TKOF ROLL FOR UNSAFE CONFIGN WARNING. WE HAD JUST HAD AN UNSCHEDULED ACFT CHANGE FROM A 300 MODEL TO A 500 MODEL. THE MINIMUM FLAP SETTING FOR TKOF IN A -500 IS FLAPS 5 DEGS. IN OUR HASTE TO GET UNDERWAY, WE DID NOT PICK UP THAT WE WERE IN A -500 SINCE BOTH COCKPITS ARE IDENTICAL. WHEN THE FO FILLED OUT THE TKOF DATA SHEET HE WROTE '1' UNDER FLAP SETTING. I CALLED FOR FLAPS 1 ON TAXI OUT. DURING TKOF WE GOT A WARNING HORN, ABORTED, CLRED THE RWY, RESET THE FLAPS AND TAXIED BACK FOR TKOF. I HAVE SINCE INSTITUTED SEVERAL CHKS TO ENSURE THIS MISTAKE WILL NOT BE REPEATED.

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.