Technical Bulletin

Seat Movement Definitions
Version 1.0

April 2019
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Seat Movement Definitions
1.0
TB 028J Ellway
April 2019
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Preface
DISCLAIMER: Euro NCAP has taken all reasonable care to ensure that the information
published in this document is accurate and reflects the technical decisions taken by theorganisation. In the unlikely event that this protocol contains a typographical error or
any other inaccuracy, Euro NCAP reserves the right to make corrections and determine
the assessment and subsequent result of the affected requirement(s).

EUROPEAN NEW CAR ASSESSMENT PROGRAMME (Euro NCAP)

Table of Contents
1.

Seat Movement Definitions ........................................................................................... 1

1.

Seat Movement Definitions

Seat Track – An adjustment that moves the entire
seat (seat cushion and seat back) in the fore and aftdirections.

Seatback – An adjustment that rotates the entire seatback, independently of the seat cushion, about a pivot
at the seat back/seat cushion joint, therefore,changing the angle of the seat back relative to the seatcushion.

Seat Height – An adjustment that moves the entire
seat vertically (seat cushion and seat back in unison).
This adjustment must keep the angle of the seatcushion similar relative to the ground. This can be
one control (2-way) that moves the whole seat inunison or a combination of controls (4-way – a toggle
or multiple knobs) that, when used together, keep theangle of the seat cushion the similar relative to theground.
NOTE: It is not possible to have 4-way seat heightand seat tilt.

+
2-way (one control)=4-way (toggle or multiple knobs)

April 20191

Seat Tilt – An adjustment that rotates the entire seat
(seat cushion and seat back in unison). Thisadjustment rotates a seat in such a way tosignificantly change the angle of the seat cushion,
relative to ground, from its full-down position. Thisadjustment can move either the front or rear of theseat in order to change the angle.

OR
Seat Cushion Height – An adjustment that moves theseat cushion vertically, independent of the seat back,while keeping angle of the seat cushion similar
relative to the ground. This can be one control (2way) that moves the whole seat cushion in unison ora combination of controls (4-way – a toggle ormultiple knobs) that, when used together, keep theangle of the seat cushion similar relative to theground.
NOTE: It is not possible to have 4-way seat cushion
height and seat cushion tilt.
Seat Cushion Tilt – An adjustment that moves theseat cushion, independent of the seat back, in such a
way to significantly change the angle of the seatcushion, relative to ground, from its full-downposition. This adjustment can move either the frontor rear of the seat cushion in order to change theangle.

+
2-way (one control)=4-way (toggle or multiple knobs)

ORApril 2019

2Lumbar Support – An adjustment that causes thelower centre portion of the seat back to protrude inorder to provide support to the lumbar section of an
occupant’s spine.

Upper Seat Back – An adjustment that rotates only
the upper portion of the seat back about a pivot pointin the seat back. This adjustment will change theangle of the upper seat back relative to the lower
portion of the seat back.

Cushion Extension – An adjustment that moves orextends a portion of the seat cushion forward so thatthe overall length of the cushion can be increased.

April 20193

Side Bolsters – An adjustment the moves the sides ofthe seat back or seat cushion so that the contour of theseat can be changed.

Head Restraint Height – An adjustment that moves
the head restraint vertically.

Head Restraint Tilt – An adjustment that moves thehead restraint horizontally.

OROR

April 20194