Section 28.121 - Unfair labor practices; Board procedures(a) Unfair labor practices are defined at GAO Order 2711.1. An allegation that a provision of GAO Order 2711.1 is inconsistent with Chapter 71 of Title 5, United States Code, and thereby denies to an employee or labor organization rights comparable to those granted by Chapter 71 of Title 5, United States Code, may also be raised under the unfair labor practice procedure.(b) An allegation that unfair labor practices have been committed shall be subject to the procedures appearing in subpart B of this part for the filing of charges, investigation by the General Counsel, and the Board's disposition, except as set forth in paragraphs (c) and (d) of this section.(c) Except as provided in paragraph (d) of this section, no petition may be filed based on any alleged unfair labor practice which occurred more than 6 months before the filing of an unfair labor practice charge with the charged party, as provided in paragraph 15e of GAO Order 2711.1, or more than 9 months before the filing of a charge with the Office of General Counsel.(d) If the Board determines that the charging party was prevented from filing the charge during the 6-month period referred to in paragraph (c) of this section by reason of: (1) Any failure of the charged party to perform a duty owed to the charging party; or(2) Any concealment which prevented discovery of the alleged unfair labor practice during the 6-month period; the charge will be considered timely filed, provided it was filed with the charged party during the 6-month period beginning on the day of the discovery of the alleged unfair labor practice by the charging party.58 FR 61992, Nov. 23, 1993, as amended at 68 FR 69303 , Dec. 12, 2003