A constant descent rate = no vertical acceleration = 1 g. However the out-of-vertical part would be sensible if the attitude of the plane was more than 15 degrees nose up. The plane would appear tilted upward to passengers with good sense of balance.
Tex Johnston's famous roll of the 707 family prototype was done at 1 g relative to the fuselage. A glass of water could be set on the dash and would not empty during such a roll, if well exectued.
Last edited by deSitter; 7th Jun 2011 at 20:00.