55 Pa. Stat. § 697.18
It is hereby declared to be the intent of the General Assembly that the authority created by this act and its members, officers, officials and employees shall enjoy sovereign and official immunity, as provided in 1 Pa.C.S. § 2310 (relating to sovereign immunity reaffirmed; specific waiver), and shall remain immune from suit except as provided by and subject to the provisions of 42 Pa.C.S. § 8501 (relating to definitions) through 8528 (relating to limitations on damages). Notwithstanding the provisions of 42 Pa.C.S. § 8525 (relating to legal assistance), the authority, through its legal counsel, shall defend actions brought against the authority, or its members, officers, officials and employees when acting within the scope of their official duties.
55 P.S. § 697.18