B777-200
Dispatch Dispatcher
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Gate; General Maintenance Action; General Flight Cancelled / Delayed
Human Factors
Aircraft X had maintenance after block out for right pack failed.  Crew and I identified MEL that could be applied as part of the process; but one of the provisions of the MEL was that there could be no dry ice carried on the aircraft.  Aircraft X was carrying over 500kg of dry ice; so no option but to return to the gate to have the dry ice taken off. Maintenance problem with the aircraft.
Air Carrier Dispatcher reported a ground gate return to remove Hazmat cargo due to an MEL restriction prohibiting the transport of Dry Ice with an active MEL.