Yes fil, i also just reported my experience with this problem ;)
Yes it's right.Quote:
to be correct: it's an option to have the packs off for takeoff as per standard operating procedures by companies but they must be turned on passing thrust reduction altitude.
never read on any fcom, fctm or sop to turn them off during the approach; it may be at pilot discretion but in very few situations: packs set to off give more engines' efficiency at high thrust settings (usually takeoff).
all the best
fil
However, when you are landing is better for you turn off pack in case of go around . So you have the best efficency for engines :)