3.3 Vehicle Set-up
Prepare the vehicle as follows:
3.3.1 Place the sill or the chassis frame of the vehicle on a rigid
horizontal surface and fix the vehicle rigidly in position;
3.3.2 Close all windows, close and lock all doors, and close and
secure any removable or opening roof structure in place over the occupant
compartment;
3.3.3 Remove all exterior roof racks or similar non-structural components.
3.4 Test Device Orientation
Orient the test device, on either the left or right side of the vehicle’s
roof structure as shown in Figure 1, so that:
3.4.1 Its longitudinal axis is at a forward angle (side view) of
5° below the horizontal and is parallel to the vertical plane through
the vehicle’s longitudinal centreline;
3.4.2 Its transverse axis is at an outboard angle, in the front-view
projection, of 25° below the horizontal.
3.5 Test Device Alignment
Maintaining the orientation specified in 3.4, align and position the
test device as follows:
3.5.1 The longitudinal centreline on its lower surface is on the
initial point of contact, or on the centre of the initial contact area,
with the roof; and,
3.5.2 The midpoint of the forward edge of the lower surface
of the test device is within 10 mm of the transverse vertical plane
254 mm forward of the forwardmost point on the exterior surface of the
roof, including windshield trim, that lies in the longitudinal vertical
plane passing through the vehicle’s longitudinal centreline.
3.6 Test Device
The plate applying the force to the roof will be a rigid and unyielding
block having a lower surface which is a flat rectangle whose dimensions
are 762 mm x 1829 mm.
3.7 Application Force
The minimum application force shall be:
3.7.1 For passenger cars 1 1/2 times the unloaded vehicle weight
of the tested vehicle or 22,240 newtons, whichever is less; or
3.7.2 For multipurpose passenger vehicles, trucks and buses, 1 1/2
times the unloaded vehicle weight of the vehicle tested.
3.8 Test Procedure
Complete the test as follows:
3.8.1 Apply the force in a downward direction perpendicular to
the lower surface of the test device at a rate of not more than 13 mm
per-second until reaching the force specified in 3.7;
3.8.2 The force specified in 3.7 must be applied within 120 seconds;
3.8.3 Guide the test device so that throughout the test it moves,
without rotation, in a straight line with its lower surface oriented as
specified in 3.4; and,
3.8.4 Measure the distance of intrusion that the test device moves,
i.e., the distance between the original location of the lower surface
of the test device and its location when the force specified 3.7 is reached.
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