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I'm new to the site and hope that this is the appropriate section of the forum for this question about engaging the FLCH SPD mode via the Boeing 747-400 MCP. I apologise in advance if it isn't. Let's assume the following: 1) I've leveled off at an FMC constraint altitude of 4000 ft with VNAV PTH and SPD pitch and A/T modes. 2) There are two other FMC constraints at 9000 ft and 15000 ft. 3) ATC has cleared me to FL240. If I dial 24000 in the Altitude window and hit the FL CH button, will it override all altitude constraints or do I have to first delete them one by one with Altitude selector knob pushes? if the constraints are not overridden, would the FL CH mode even engage? Maybe my thinking is incorrect here, but if it does engage with the altitude constraint still in place, wouldn't that result in a sort of weird situation with airspeed control shifting from throttles to elevators, and the THR A/T mode attempting to hold current constrained altitude. it seems more logical to me that FL CH would eliminate all altitude constraints between the airplane and the selected MCP altitude, but I'm guessing here. Thanks
