Document ID: chunk:federal_register_of_legislation:F2005L03990:reg:60:p7
Version: federal_register_of_legislation:F2005L03990
Segment Type: reg
Provision Reference: reg 60 (pt 7/9)
Character Range: 84221–86827

range before each test.
2 3.4.  The rigid impactor comprises a horizontal cylinder diameter 50  2 mm and a pendulum support arm diameter 19  1 mm (Figure 3a). The cylinder has a mass of 1,25  0,02 kg including instrumentation and any part of the support arm within the cylinder. The pendulum arm has a mass of 285  5 g. The mass of any rotating part of the axle to which the support arm is attached should not be greater than100 g. The length between the central horizontal axis of the impactor cylinder and the axis of rotation of the whole pendulum shall be 1250  1 mm. The impact cylinder is mounted with its longitudinal axis horizontal and perpendicular to the direction of impact. The pendulum shall impact the underside of the foot, at a distance of 185  2 mm from the base of the heel resting on the rigid horizontal platform, so that the longitudinal centre line of the pendulum arm falls within 1° of a vertical line at impact. The impactor shall be guided to exclude significant lateral, vertical or rotational movement at time-zero.
2.3.5.  Allow a period of at least 30 minutes between successive tests on the same leg.
2.3.6.  The data acquisition system, including transducers, shall conform to the specifications for CFC 600, as described in annex 8.
2.4.  Performance specifications
2.4.1.  When the ball of each foot is impacted at 6,7  0,2 m/s in accordance with paragraph 2.3., the maximum tibia bending moment about they-axis (My) shall be between 100 Nm and 140 Nm.
3.  LOWER FOOT IMPACT TEST
3.1.  The objective of this test is to measure the response of the Hybrid III foot skin and insert to well-defined, hard-faced pendulum impacts.
3.2.  The complete Hybrid III lower leg assembly, left (86-5001-001) and right (86-5001-002), equipped with the foot and ankle assembly, left (78051-614) and right (78051-615), shall be used, including the knee assembly. The load cell simulator (78051-319 Rev A) shall be used to secure the knee-cap assembly (78051-16 Rev B) to the test fixture.
3.3.  Test procedure
3.3.1.  Each leg assembly shall be maintained (soaked) for 4 hours prior to the test at a temperature of 22  3°C and a relative humidity of 40  30 per cent. The soak period shall not include the time required to reach steady state conditions.
3.3.2.  Align the impactor accelerometer with its sensitive axis parallel to the impactor longitudinal centre line.
3.3.3.  Clean the impact surface of the skin and also the impactor face with isopropyl alcohol or equivalent prior to the test.
3.3.4.  Mount the leg assembly to the fixture shown in Figure 1b. The test fixture