A330 ALT versus V/S 0
Hi all,
I just started an A330 course and, while studying the system, I have a question regarding the function of the ALT and Push-to-level off V/S button on the FCU. My understanding is that both buttons have the same function as to perform an immediate level off at the desired altitude but my question is:
When an immediate level off is performed by ALT button, the ALT mode appears on the FMA and the altitude is maintained. When there is any disturbance to the flight such as updraft or turbulence and the a/c deviate from the altitude then the ALT mode will resume the a/c back to the altitude being held. But if the level off is performed by pushing the V/S button, the V/S +0 appears on the FMA. In this case, will the a/c resume its altitude after the disturbance?
I tried to look for the explaination in the FCOM but still could not find the answer. Any comment will be appreciated.
Subria