Thank you Sir:D

Does the 747-400 behave similarly with V/S selected (aircraft previously in ALT hold or VNAV cruise) and the selected Altitude equal to the current altitude?

I did some FD tests on the ground (IRU's aligned) last week. I adjusted the baro to a few hundred feet and selected the same feet on the MCP. Then I selected ALT Hold, then V/S.
V/S was then annuciated on the FMA.

Thanks
Rgds
NSEU

B777 DESCENDS on VS even on ALT
 

I actually tried this on the flight simulator and erroneously by a colleague at the actual aircraft.

The a/c will descend:
That is FMA ALT, say at 5000' MCP, then select VS -1000'.

The altitude alert will sound off at 300' below selected MCP altitude.

With regard to reference, I cannot find any. FCTM recommends minimum 1000' above AFE as already mentioned as protection say on intercepting glide slope from above.

Does anybody know as to whom in Boeing we can address this?

Safe flights to all!