Ariz. Rev. Stat. § 14-10604
A. A person may commence a judicial proceeding to contest the validity of a trust that was revocable at the settlor's death within the earlier of:
B. On the death of the settlor of a trust that was revocable at the settlor's death, the trustee may proceed to distribute the trust property in accordance with the terms of the trust. The trustee is not subject to liability for doing so unless either: