This study aims to analyze the passive participle in Standard Arabic within the framework of autosegmental phonology. It focuses on the pattern of non-derived, triliteral verbs /maCCu:C/. The sample of the study is collected from three sources Wehr (1994), Wright (1996), and Al-waSi:T Dictionary (2004). The study discusses strong, weak, geminated, and glottalized verbs using the X-skeleton of autosegmental phonology. It considers the imperfective stem as the basic form from which other forms are derived. The findings indicate that strong, geminated, and glottalized stems show regularity to the pattern /maCCu:C/. Nevertheless, irregularities from the general pattern are observed with weak verbs due to the unstable nature of glides in Standard Arabic. Also, the study shows that autosegmental phonology provides an adequate analysis for the passive participle.