B767-300 and 300 ER
Communication Breakdown
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem
Human Factors
Dispatch received Supplemental Dry Ice request from ramp agent at XA12z. We made a note to send an ACARS to crew with the amendment of ' Dry Ice Supplemental Procedures in Effect'. However; the aircraft never showed 'initialized'. We noticed a block out time without an initialization; and realized that the aircraft was taxiing without having the dry ice amendment. Also noticed that several other flights were showing out of the gate without showing 'initialized'. We were not sure where on the airport property the flight was; so we called ZZZ Tower and had the crew call Dispatch. Crew called and we did the release amendment.  Event was caused due to ACARS initialization never read over; so Dispatch did not know crew was on the aircraft yet.
Air Carrier Dispatcher reported an aircraft taxied without complete Hazmat documents. Flight Release amendment was sent to flight crew.