The Federal Aviation Administration requires all ai rcraft manufacturers to ad here to maximum noise level standards. Thus, a bias acoustic l i ner is introduced. to intensi fy the noise eq u ipment system. as well as preven t ice accumulation on the nacelle 0-chamber. The hotspot phenomenon. by the Piccolo tu be anti-i<.:ing sysh:m. cou ld damage t he bias acoustic liner. Therefore. a swi rl ant i-icing system is fu rther i n vestigated, to reduce t he hotspot t:ffcct on the bi as acoustic l iner. The pr