737NG VNAV Descents
Can anyone tell me whether a VNAV PATH descent will provide overspeed protection on the 737 NG?
I was always under the impression that if the aircraft were high on the descent profile, it would pitch further down and regain the path by accelerating, but that it would not exceed any limit speeds (it would revert to LVL CHANGE and the FMCCDU message would read OVERSPEED DISCONNECT). On three separate occasions recently, colleagues have witnessed the aircraft dive for the profile in VNAV PATH, and speed has increased until the clackers went off, at which point they manually reverted to LVL CHANGE and wound the speed back.
I certainly never saw this happen on the 737-300: has anything been changed?