This proposed gtr recommends a damped accelerometer ( as specified in INF GR/PS/133 ) in the adult and child headform impactors . As explained in INF GR/PS/96 , in a research program in 2002 using the Japanese New Car Assessment Program ( J-NCAP ) headform test with undamped accelerometers , abnormal acceleration signals with high HIC values were recorded frequently in windshield impacts , and also in bonnet impacts .