Test Procedures
3.1 Replace every flexible chassis-to-body mounts with rigid mounts.
3.1.1 Place the vehicle on a rigid horizontal surface so that the
vehicle is entirely supported by means of the vehicle frame; or
3.1.2 For vehicles constructed without a frame, place the vehicle
on its body sills.
3.2 Remove any components which extend upward from the roof.
3.3 To apply the required force, use a flat, rigid, rectangular force
application plate that has the following dimensions measured with respect
to the vehicle roof longitudinal and lateral centerlines:
(a) for vehicles with GVWR of more than 4536 kg (10,000 pounds),
305 mm (12 inches) shorter than the vehicle roof and 914 mm (36 inches)
wide; and
(b) for vehicles with GVWR of 4536 kg (10,000 pounds) or less, 127
mm (5 inches) longer and 127 mm (5 inches) wider than vehicle roof.
For the purpose of these measurements, the vehicle roof is that structure,
seen in the top projected view, that coincides with the passenger and
driver compartment of the vehicle.
3.4 Position the force application plate on the vehicle roof such
that:
(a) its rigid surface is perpendicular to a vertical longitudinal
plane,
(b) it contacts the roof at not less than two points,
(c) its longitudinal centerline coincides with the top projected
view of the vehicle longitudinal centerline, and
(d) its front and rear edges are an equal distance from the front
and rear edges at the centerline of the vehicle roof top projected view.
3.5 Apply an evenly-distributed vertical force in the downward direction
to the force application plate such that,
(a) the rate of travel of the force application plate does not exceed
12.7 mm/sec (0.5 inch per second), or
(b) the rate of application of the force does not exceed 4000 N
to 4450 N (900 to 1,000 pounds) per minute, until a force 2224 N (500
pounds) has been applied.
3.6 Apply additional vertical force in the downward direction to the
force application plate using the same rate specified in paragraphs 3.5(a)
or 3.5(b) until the force specified in Section
220 of Schedule D of the Motor Vehicle Safety Regulations has been
achieved, and maintain this force until the procedures in paragraphs 3.7
and 3.8(a) have been completed.
3.7 Measure the maximum downward movement of any point on the force
application plate that occurred during the application of the force in
accordance with paragraph 3.6.
3.8 To test the compliance of the vehicle's exits to the opening requirements
of Section
220 of Schedule D of the Motor Vehicle Safety Regulations:
(a) in the case of testing with the force applied, open the emergency
exits as specified in section 220 while maintaining the force applied
in accordance with paragraphs 3.5 and 3.6; and
(b) in the case of testing following the release of the force, release
all downward force applied to the force application plate and open the
emergency exits as specified in section 220.
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