In the VNAN climb on B737, the FMC changes the target speed from V2+20kt at liftoff, to 230kt for acceleration at the preset accleration height, then to 250kt (below 10,000ft) as the leading edge devices are fully retracted along with the trailing edge flaps.
My question is: Why is the climb speed limited to 230kt on the VNAV mode until the leading edge devices are fully retracted, when there are only operating speed limits to trailing edge flaps as below?
For your information, I've found a discussion on this topic on another aviation website but no one seems to have a definite answer to this.
https://www.pprune.org/tech-log/570676-737ng-led-s-speed-limitations-ops.html
Does anybody have a good answer to this?