(a) At any time within five years after approval by the convening authority of a court-martial sentence, the accused may petition the convening authority for a new trial. Some good reason, including but not limited to newly discovered evidence or fraud on the court-martial, must be shown as to why the petition should be granted.
(b) The decision of the convening authority provided for under subsection (a) of this Code section shall be appealable as provided for under Code Section 38-2-1067.