At 10:10am Airway Examiner discovered a roof fall in #6 entry on Byrd Mains #2. The fall fell above the ancourage point and measured 45'x19.5'x5' thick. The fall was dangered off and lifeline was re-routed to #7 entry to provide a continuous means of egress from section. Area was previously mined 8 years ago and 4' fully grouted bolts utilized.