The article is devoted to the accentuation of full and short forms of passive past participles, formed with the suffix -t- from the verb stems by-, vi-, zh-, li-, pi-, -ya- (nya-) with various prefixes (zavitiy, razvitiy, obvitiy, zaniyatiy, prinyatiy, zapitiy, otpitiy and similar forms). In the full form of the passive participles formed from the verbs under consideration, as well as in the short form singular (masculine and neuter) and plural forms the stress can fall either on the prefix or on the root: dopitiy – dopitiy, dopit – dopit, obzhitiy – obzhitiy, obzhit – obzhit . Modern orthoepic dictionaries record this accentual variability, but, firstly, there is no uniformity of codification in different editions, and secondly, the recommendations are often at odds with the usus. On the basis of the data obtained in a series of experiments in the analyzed forms, the article reveals the main patterns of stressing and compares the results of the experiment with codified variants of stress, and raises the question of the need to revise the norms in orthoepic source. In addition, the article raises the question of the status in the modern Russian literary language of forms with a stressed ending -oy: nalitoy, zavitoy, obzhitoy, as well as the likelihood of using short forms of the neuter singular and plural participles with a stressed ending such as nalito, zavito, obzhito and similar forms, which are recorded by orthoepic dictionaries.