Narrative:

Takeoff runway 21R, detroit metropolitan, detroit metropolitan 7 departure. After takeoff we were issued a right turn to 230 heading with further vectors to a northeast heading to intercept dxo 006 radial. Flight directors were on. Center autoplt was in command mode with VNAV engaged, heading select engaged and LNAV armed. The wind read out at 3000' was 230/50 KTS. We had been cleared to climb to 13,000' and same had been selected on the (MCP) mode control panel. We had also been instructed to maintain 250 KTS. I had not heard the speed restriction and the speed restriction had not been entered into the (FMS) flight management system. The wing flaps had been retracted on speed schedule and the aircraft was maintaining approximately 285 KTS. 285 KTS was the minimum speed for the aircraft confign (clean). At 10,000' the aircraft started to accelerate to VNAV climb speed. At approximately 310 KTS the controller asked our speed and at this point my first officer (PNF) said we were supposed to be at 250 KTS. I had the first officer request 285 KTS and we were granted same. Speed intervene - 285 KTS was selected on the MCP and the aircraft was decelerating rapidly. At this point it seemed the autoflt system became confused and failed to level the aircraft at 13,000'. I selected altitude hold on the MCP and the aircraft leveled at 13,300'. I further selected vertical speed and 1000 FPM rate of descent on the MCP and the aircraft descended to and maintained 13,000'. I feel this incident occurred because I failed to hear the speed restriction and we failed to enter the speed restriction into the flight management system. Also the aircraft flight management system failed to level the aircraft at 13,000' for reasons unknown to us. Callback conversation with reporter revealed the following: further investigation revealed the following: reporter states that this widebody transport at maximum ATOG requires a speed of 280-285 KTS IAS for clean maneuvering. The VNAV system will automatically use this speed regardless of altitude. Therefore, this aircraft requires greater than 250 KTS IAS below 10,000' on departure. This is apparently not widely known in ATC circles.

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Original NASA ASRS Text

Title: ALT DEVIATION. OVERSHOOT IN CLIMB. SPEED DEVIATION.

Narrative: TKOF RWY 21R, DETROIT METRO, DETROIT METRO 7 DEP. AFTER TKOF WE WERE ISSUED A RIGHT TURN TO 230 HDG WITH FURTHER VECTORS TO A NE HDG TO INTERCEPT DXO 006 RADIAL. FLT DIRECTORS WERE ON. CENTER AUTOPLT WAS IN COMMAND MODE WITH VNAV ENGAGED, HDG SELECT ENGAGED AND LNAV ARMED. THE WIND READ OUT AT 3000' WAS 230/50 KTS. WE HAD BEEN CLRED TO CLIMB TO 13,000' AND SAME HAD BEEN SELECTED ON THE (MCP) MODE CTL PANEL. WE HAD ALSO BEEN INSTRUCTED TO MAINTAIN 250 KTS. I HAD NOT HEARD THE SPEED RESTRICTION AND THE SPEED RESTRICTION HAD NOT BEEN ENTERED INTO THE (FMS) FLT MGMNT SYSTEM. THE WING FLAPS HAD BEEN RETRACTED ON SPEED SCHEDULE AND THE ACFT WAS MAINTAINING APPROX 285 KTS. 285 KTS WAS THE MINIMUM SPEED FOR THE ACFT CONFIGN (CLEAN). AT 10,000' THE ACFT STARTED TO ACCELERATE TO VNAV CLIMB SPEED. AT APPROX 310 KTS THE CTLR ASKED OUR SPEED AND AT THIS POINT MY F/O (PNF) SAID WE WERE SUPPOSED TO BE AT 250 KTS. I HAD THE F/O REQUEST 285 KTS AND WE WERE GRANTED SAME. SPEED INTERVENE - 285 KTS WAS SELECTED ON THE MCP AND THE ACFT WAS DECELERATING RAPIDLY. AT THIS POINT IT SEEMED THE AUTOFLT SYSTEM BECAME CONFUSED AND FAILED TO LEVEL THE ACFT AT 13,000'. I SELECTED ALT HOLD ON THE MCP AND THE ACFT LEVELED AT 13,300'. I FURTHER SELECTED VERTICAL SPEED AND 1000 FPM RATE OF DSCNT ON THE MCP AND THE ACFT DESCENDED TO AND MAINTAINED 13,000'. I FEEL THIS INCIDENT OCCURRED BECAUSE I FAILED TO HEAR THE SPEED RESTRICTION AND WE FAILED TO ENTER THE SPEED RESTRICTION INTO THE FLT MGMNT SYSTEM. ALSO THE ACFT FLT MGMNT SYSTEM FAILED TO LEVEL THE ACFT AT 13,000' FOR REASONS UNKNOWN TO US. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: FURTHER INVESTIGATION REVEALED THE FOLLOWING: REPORTER STATES THAT THIS WDB AT MAX ATOG REQUIRES A SPEED OF 280-285 KTS IAS FOR CLEAN MANEUVERING. THE VNAV SYSTEM WILL AUTOMATICALLY USE THIS SPEED REGARDLESS OF ALT. THEREFORE, THIS ACFT REQUIRES GREATER THAN 250 KTS IAS BELOW 10,000' ON DEP. THIS IS APPARENTLY NOT WIDELY KNOWN IN ATC CIRCLES.

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.