Optional

Differential seat cushion module, port & starboard, positive ‘G’ cueing and roll accelerations.

Independent port & starboard, lap harness cueing – Roll acceleration + Negative ‘G’ cueing.

Arrested landings, both land and carrier, and Catapult launch sensations are achieved using a ‘CatLander’ system which consists of a torque motor mounted in the seat headbox giving a horizontal pull on the shoulder straps.

Changes in eye height are made by moving the seat bucket (pan) up and down on the seat height mechanism. This is achieved by an electric actuator which serves to provide the pilots' reference eye height position and the variations in eye height that take place due to vertical ‘g’. The actuator is sized such that total seat height movement is nominally the same as for the real aircraft seat within the constraints of the existing seat space envelope. Eye height changes due to ‘g’ take place around the datum of the reference height setting and under simulated negative ‘g’ conditions the seat bucket rises. Under positive ‘g’ it is lowered. This actuator also provides a small displacement, high frequency input to simulate airframe vibrations and/or buffet.

The feel of the seat cushion is varied by a mechanism that raises and lowers to harden and soften the cushion feel. Roll acceleration cueing is provided by differential actuation of the port/starboard cushion module and movement of the upper torso via the backpad lateral module.

Variation in shoulder harness tension is achieved by connecting the harness to independent torque motors. The harness is shortened i.e. more tension for negative ‘g’ and lengthened for positive ‘g’. As a safety feature the design prevents over-tightening of the shoulder straps.

The seat backpad moves fore and aft to provide localised variation in back pressure as experienced during longitudinal acceleration. The dynamic element is a mechanism driven by an electric actuator located inside the seat back rest.

A further actuator also located in the seat back rest is used to impart lateral displacement to the back rest thus providing lateral acceleration cues.

For further information please contact Graham Campion on +44 (0) 1234 754160 or send an email.