AF 447 Thread No. 10

[HazelNuts39]

BOAC,

Thanks for the link. Very interesting, and confirms what I thought:

Slide 24: The gravity-inertial acceleration (GIA) is the vector sum of the vector of gravitational acceleration (upward) and all other accelerations.
Slide 25: A somatogravic illusion is a false sensation of body tilt that results from perceiving as vertical the direction of non-vertical gravito-inertial acceleration or force.

The direction of the GIA is the same as that of the pendulum suspended from the cockpit ceiling. Its orientation to the airplane longitudinal axis does not change when the airplane pitches up. Its orientation relative to the pilot's head doesn't change if the pilot doesn't change his position relative to the airplane. To convey the same sensation in a sim, the sim's cab doesn't tilt like the airplane it simulates.

EDIT:: Perhaps we should be talking about somatogyral isnstead of somatogravic illusions.