Narrative:

On initial climb to assigned SID altitude of 5000 ft MSL, the FMS autothrust/thrust management were engaged and appeared to be functioning normally. Reaching intermediate altitude of 5000 ft MSL, the aircraft was leveled off. At that time the thrust levers failed to retard as prescribed to maintain 250 KTS. I disengaged the autothrust and immediately reduced power to idle. Despite immediate corrective action, the aircraft attained a speed of 265 KIAS before corrective action took effect. The FMS and associated system were set up and operated in accordance with published procedures. My copilot was a check airman and claimed that the system were incapable of managing the aircraft speed in this scenario, even though published guidance says that it will. This type of speed overshoot seems to be inevitable when using our published procedures. Most crews do not use the FMS for initial climb because of this problem. I needed to use it in order to demonstrate to the check airman my adherence to standard procedures.

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Original NASA ASRS Text

Title: L1011 ACFT ON SID AND LEVELING AT 5000 FT WITH AUTOTHRUST FMS ENGAGED, THE THROTTLES DIDN'T RETARD QUICKLY ENOUGH TO MAINTAIN REQUIRED 250 KTS. RPTR CAPT DISCONNECTED AND RETARDED THEM MANUALLY.

Narrative: ON INITIAL CLB TO ASSIGNED SID ALT OF 5000 FT MSL, THE FMS AUTOTHRUST/THRUST MGMNT WERE ENGAGED AND APPEARED TO BE FUNCTIONING NORMALLY. REACHING INTERMEDIATE ALT OF 5000 FT MSL, THE ACFT WAS LEVELED OFF. AT THAT TIME THE THRUST LEVERS FAILED TO RETARD AS PRESCRIBED TO MAINTAIN 250 KTS. I DISENGAGED THE AUTOTHRUST AND IMMEDIATELY REDUCED PWR TO IDLE. DESPITE IMMEDIATE CORRECTIVE ACTION, THE ACFT ATTAINED A SPD OF 265 KIAS BEFORE CORRECTIVE ACTION TOOK EFFECT. THE FMS AND ASSOCIATED SYS WERE SET UP AND OPERATED IN ACCORDANCE WITH PUBLISHED PROCS. MY COPLT WAS A CHK AIRMAN AND CLAIMED THAT THE SYS WERE INCAPABLE OF MANAGING THE ACFT SPD IN THIS SCENARIO, EVEN THOUGH PUBLISHED GUIDANCE SAYS THAT IT WILL. THIS TYPE OF SPD OVERSHOOT SEEMS TO BE INEVITABLE WHEN USING OUR PUBLISHED PROCS. MOST CREWS DO NOT USE THE FMS FOR INITIAL CLB BECAUSE OF THIS PROB. I NEEDED TO USE IT IN ORDER TO DEMONSTRATE TO THE CHK AIRMAN MY ADHERENCE TO STANDARD PROCS.

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.