B737-300 first officer performed a slow speed rejected takeoff (rejected takeoff) after the takeoff ...

Narrative:

We were cleared for takeoff.... All checklists had been completed.... Turning onto the runway; the captain increased the N1's to approximately 40-50% for a 'rolling takeoff.' aircraft control was passed to me at which time I advanced the thrust levers. The takeoff warning horn sounded and I immediately retarded the thrust levers. The captain quickly checked the speedbrake handle and the flap handle and advanced the thrust levers again. The takeoff warning horn sounded again and I once again reduced the thrust levers.tower was notified and we cleared the runway.... The captain 'jiggled' the flap handle and the speedbrake lever and then performed another takeoff warning horn check. This time the check passed. Tower cleared us for takeoff and a normal takeoff occurred. The rest of the flight was uneventful and an 'info only' write-up was logged regarding the erroneous takeoff warning horn.

Original NASA ASRS Text

Title: B737-300 First Officer performed a slow speed Rejected Takeoff (RTO) after the Takeoff Configuration Warning Horn sounded. After the Captain 'jiggled' the flap handle and speedbrake lever; Configuration Warning did not sound on the second takeoff.

Narrative: We were cleared for takeoff.... All checklists had been completed.... Turning onto the runway; the Captain increased the N1's to approximately 40-50% for a 'rolling takeoff.' Aircraft control was passed to me at which time I advanced the thrust levers. The Takeoff Warning horn sounded and I immediately retarded the thrust levers. The Captain quickly checked the speedbrake handle and the flap handle and advanced the thrust levers again. The Takeoff Warning horn sounded again and I once again reduced the thrust levers.Tower was notified and we cleared the runway.... The Captain 'jiggled' the flap handle and the speedbrake lever and then performed another Takeoff Warning Horn check. This time the check passed. Tower cleared us for takeoff and a normal takeoff occurred. The rest of the flight was uneventful and an 'info only' write-up was logged regarding the erroneous Takeoff Warning horn.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1246078
Time
Date	201503
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Component
Aircraft Component	Safety Instrumentation & Information
Person 1
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 167 Flight Crew Type 4000
Events
Anomaly	Aircraft Equipment Problem Less Severe

B737-300 first officer performed a slow speed rejected takeoff (rejected takeoff) after the takeoff configuration warning horn sounded. After the captain 'jiggled' the flap handle and speedbrake lever; configuration warning did not sound on the second takeoff.