B737-300
Flight Crew Last 90 Days 167; Flight Crew Type 4000
Aircraft Equipment Problem Less Severe
Flight Crew Rejected Takeoff; General Flight Cancelled / Delayed
Aircraft
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.
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.