767; why LNAV/VNAV doesnt require A/P?

[G-STAW]

Evening pprune,

ive just been scanning through the 767 cbt and it has become aparent that on takeoff, LNAV and VNAV doesnt require the A/P to be engaged for flight controls to move to maintain the FMC flight profile.

but the 767 AOM states that the autopilot moves the flight controls so why does the flight controls move when the A/P is disconnected?

is it that LNAV and VNAV are in some way seperate to the other modes on the MCP?

thanks

G-STAW