8che
Although I had 10 years on the B767 It was over 16 years ago but despite operating across the Atlantic and to the Far East and Australia I suppose I must have encountered turbulence in the descent from time to time but I never had to disconnect the A/P so you guessed wrong. I cannot for the life of me remember how I survived without using the V/S mode except as I later mentioned when wanting to get on the G/S from above.
As it was a long time ago I do not really want to get into the technical merits of FLCH v V/S but surely if I was descending in VNAV at say 320 IAS and wanted to reduce to say 280 due turbulence going to FLCH and winding in 280 would have the same effect as using V/S and reducing the rate of descent? Bit like going from Managed to Selected in the Airbus surely?