---
kind: "section"
citation: "49 C.F.R. § 572.126"
title: "49"
number: "572.126"
heading: "Knees and knee impact test procedure."
url: "https://uscodex.org/cfr/49/572.126"
---

# §572.126. Knees and knee impact test procedure.

- (a) **Knee assembly.** The knee assembly is part of the leg assembly (drawing 127-4000-1 and -2).
- (b) When the knee assembly, consisting of knee machined (drawing 127-4013), knee flesh (drawing 127-4011), lower leg (drawing 127-4014), the foot assembly (drawing 127-4030-1(left) and -2 (right)) and femur load transducer (drawing SA572-S10) or its structural replacement (drawing 127-4007) is tested according to the test procedure in [section 572.127(c)](/cfr/49/572.127.md?p=c), the peak resistance force as measured with the test probe mounted accelerometer must be not less than 2.0 kN (450 lbf) and not more than 3.0 kN (674 lbf).
- (c) **Test procedure.** The test procedure for the knee assembly is as follows:
  - (1) Soak the knee assembly in a controlled environment at any temperature between 18.9 and 25.6 °C (66 and 78 °F) and a relative humidity from 10 to 70 percent for at least four hours prior to a test.
  - (2) **Mount the test material and secure it to a rigid test fixture as shown in Figure N6.** No contact is permitted between any part of the foot or tibia and any exterior surface.
  - (3) Align the test probe so that throughout its stroke and at contact with the knee it is within 2 degrees of horizontal and collinear with the longitudinal centerline of the femur.
  - (4) Guide the pendulum so that there is no significant lateral vertical or rotational movement at time-zero.
  - (5) The test probe velocity at the time of contact shall be 2.1 ±0.03 m/s (6.9 # 0.1 ft/s).
  - (6) No suspension hardware, suspension cables, or any other attachments to the probe, including the velocity vane, shall make contact with the dummy during testing.

## Notes

### Amendments

[65 FR 2065, Jan. 13, 2000, as amended at 67 FR 47328, July 18, 2002]

### Source

Source: 65 FR 2065, Jan. 13, 2000, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 322, 30111, 30115, 30117 and 30166; delegation of authority at 49 CFR 1.95

### Amendments

[65 FR 2065, Jan. 13, 2000, as amended at 67 FR 47328, July 18, 2002]