246 Pa. Code Rule 311
Service of the complaint upon an unincorporated association shall be made upon the manager, clerk or other person for the time being in charge of any place where such association regularly conducts any business or association activity, provided the person served is not a plaintiff in the action.
Official Note
Compare Pa. R.C.P. No. 2157(a). Service by mail is not allowed under this rule because of the irregularity of operation of many unincorporated associations.