B737 Common VNAV

[Lewys2209]

Hi All-

I am brand new on type, and I trained using the ‘Basic’ VNAV on the 737, but now I will be going on to use the ‘Common’ VNAV option… I can’t seem to find anywhere that explains exactly what the differences are.

My previous understanding was that VNAV + SPD INTV to a speed higher than target behaved in a similar manner to LVL CHG in a descent, but it appears the same is not necessarily true for Common VNAV. if anyone could point me in the direction of something handy, it would be well appreciated!

[Banana Joe]

I'm not sure what you're talking about, but I suppose you're talking about FMC U14.0?

FMC Update 14 (b737.org.uk) (http://www.b737.org.uk/fmc_u14.htm)

VNAV path tracking priority energy compensation.

Maintains vertical path by adding thrust when a speed increase command is received via speed intervention.
FMC will set VNAV target altitude to the current go-to waypoint constraint altitude if the waypoint is an “at or above” altitude constraint to prevent unintended climbs in descent.