September 16, 201312 yr Hi Found this problem tonight. Departing EGKK on 26L SID SAM1X. I was cleared to climb above all altitude constraints. I dialled in my new FL on the MCP and pressed the altitude selector knob to clear each restriction in turn which was fine. I then accidentally pushed the knob once to often and found that the FMC had now had entries by each leg of 170kts and my speed was decreasing from 250kts to 170kts. The only way I could accelerate was in FLCH mode. The VNAV page of the FMC was showing I should be climbing at 250kts, but when I selected VNAV again from FLCH the speed would begin to drop to 170kts. I could only accelerate in VNAV mode with a selected speed in the MCP window. Can any of you guys could try this out to see if the same happens to you? Tony Simpson FLYING FROM EGKK, The worlds busiest single runway Airport.
September 16, 201312 yr Commercial Member Hi, What is the complete route (including airways)? Best regards, Robin.
September 17, 201312 yr Author Hi EGKK-TBPB After the SAM1X SID off 26L it's was Direct LND then Direct Lon/Lat entries in the FMC to cross the Atlantic. The problem is more that when you have deleted all the constraints in the FMC then press the altitude selector knob on the MCP once more without selecting a higher altitude, the FMC seems to add a speed Of 170kts to the remaining legs Tony Simpson FLYING FROM EGKK, The worlds busiest single runway Airport.
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