Date: 201510
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: Thunderstorm
Aircraft: A300
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Cargo / Freight / Delivery
Flight phase: Takeoff / Launch
ATC / advisory: Tower ZZZ
Aircraft component: Autothrottle/Speed Control
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Flying; Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Second reporter function: First Officer; Pilot Not Flying
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: Taxi
Result: Flight Crew Rejected Takeoff
Contributing factors: Procedure
Primary problem: Procedure

Narrative: During takeoff roll; the throttles split during engine run-up. I attempted to match the throttles by pushing up Number 1 throttle when the auto throttles disconnected. I initially thought that I may have inadvertently hit the auto-throttles disconnect on the left throttle. We rejected takeoff at approximately 80-90 KTS and cleared the runway. After completing the rejected takeoff checklist and after landing checklist; we called maintenance control and the Duty Officer concerning the reject. Maintenance advised us to attempt another takeoff and the Duty Officer advised us to fill out a safety report for the rejected takeoff. We reconfigured the aircraft in accordance with the checklist; and completed all checklist to perform another takeoff. During the second attempted takeoff; we rejected again. During run-up of the engines; the auto-throttles lever kicked off and the ECAM warning initiated. We rejected again; ran the rejected takeoff checklist; after landing checklist; then initiated the maintenance process. The auto-throttles were inoperative and we had to make a non-profile takeoff and departure.System malfunction caused the auto-throttles to malfunction during takeoff roll. The auto-throttles would disconnect during engine run up for takeoff resulting in a reject and a non-profile takeoff after the MEL was complied with.


Second narrative: On initial takeoff at about 70 KTS Auto Throttle System (ATS) disconnected with an ECAM message and paddle switch disconnect. Captain stated that he inadvertently hit the throttle disconnect button. Captain rejected and we exited the runway and we performed all applicable checklists. In consultation with maintenance and duty officer all were in agreement that since the cast disconnected the ATS inadvertently the aircraft was good and no write up needed. We reconfigured and attempted another takeoff. On the second attempt ATS again disconnected on power application. Crew wrote up the ATS via maintenance process and completed all checklists. Rest of flight uneventful. Crew should have written up ATS after first failure. The auto-throttles don't disconnect via the throttles buttons. The throttle buttons disengage the ATS and on some aircraft you get an ecam message. I believe we misdiagnosed the problem.


Synopsis: A-300 Captain rejected the takeoff when the auto-throttles were disconnected. Thinking that he had inadvertently hit the disconnect switch; and after consultation with maintenance control; he attempted another takeoff with the same result. Engine run-up detected an ECAM warning for a malfunctioning auto-throttle system.