5 C.F.R. § 2422.5

(a) Where to file. You must file a petition with the Regional Director for the region in which the unit or employee(s) affected by issues raised in the petition are located. If the unit(s) or employees are located in two or more regions of the Authority, you must file the petitions with the Regional Director for the region where the headquarters of the agency or activity is located.

(b) Method of filing. You may file a petition with the Regional Director in person or by commercial delivery, first class mail, facsimile, certified mail, or electronically through use of the eFiling system on the FLRA's Web site at www.flra.gov. If you file electronically or by facsimile transmission you are not required to file an original copy of the petition with the Region. You assume responsibility for the Regional Director's receipt of a petition.

(c) Date of filing. When a Regional Director receives a petition, it is deemed filed, subject to the following conditions. A petition received electronically or by facsimile on a business day—even if it is received outside a Region's business hours—is deemed filed on the day on which it is received (either by the Regional Office fax machine or by the eFiling system), using the local time in the Region where it is filed. A petition received electronically or by facsimile on a non-business day is deemed filed on the next business day after it is received (either by the Regional Office fax machine or by the eFiling system), using the local time in the Region where it is filed. When a Region receives a petition by any other method during its business hours, it is deemed filed that day. But when a Region receives a petition by any other method after the close of the business day, or on a non-business day, it will be deemed filed on the next business day after it is received. The business hours for each of the Regional Offices are set forth at https://www.flra.gov.