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(a) The test probe for thoracic impacts, except for attachments, shall be of rigid metallic construction and concentric about its longitudinal axis. Any attachments to the impactor, such as suspension hardware, impact vanes, etc., must meet the requirements of § 572.154(c)(7). The impactor shall have a mass of 2.86 ±0.02 kg (6.3 ±0.05 lbs) and a minimum mass moment of inertia of 164 kg-cm 2 (0.145 lb-in-sec 2) in yaw and pitch about the CG of the probe. One-third of the weight of suspension cables and any attachments to the impact probe must be included in the calculation of mass, and such components may not exceed five percent of the total weight of the test probe. The impacting end of the probe, perpendicular to and concentric with the longitudinal axis of the probe, has a flat, continuous, and non-deformable 101.6 ±0.25 mm (4.00 ±0.01 in) diameter face with an edge radius of 7.6/12.7 mm (0.3/0.5 in). The impactor shall have a 101-103 mm (4-4.1 in) diameter cylindrical surface extending for a minimum of 12.5 mm (0.5 in) to the rear from the impact face. The probe's end opposite to the impact face has provisions for mounting an accelerometer with its sensitive axis collinear with the longitudinal axis of the probe. The impact probe shall have a free air resonant frequency of not less than 1000 Hz measured in line with the longitudinal axis of the impactor, using the test method shown in the Procedures for Assembly, Disassembly and Inspection (PADI) document referenced in § 572.151.

(b) Head accelerometers shall have the dimensions, response characteristics, and sensitive mass locations specified in drawing SA572-S4 and be mounted in the head as shown in drawing 921022-000.

(i) The outputs of acceleration and force-sensing devices installed in the dummy and in the test apparatus specified by this part are recorded in individual data channels that conform to the requirements of SAE Recommended Practice J211/1, Rev. Mar95 “Instrumentation for Impact Tests— Part 1 —Electronic Instrumentation” (refer to § 572.150(a)(3) ), with channel classes as follows:

(1) Head and headform acceleration—Class 1000.

(j) Coordinate signs for instrumentation polarity shall conform to SAE J1733, 1994-12, “Sign Convention For Vehicle Crash Testing, Surface Vehicle Information Report,” (refer to § 572.150(a)(4) ).

(k) The mountings for sensing devices shall have no resonance frequency within a range of 3 times the frequency range of the applicable channel class.

(n) Surfaces of dummy components may not be painted except as specified in this subpart or in drawings referenced in § 572.150.