Dispatch Dispatcher
Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed
Procedure; Human Factors; Aircraft
Fuel dump due [to a] pressurization issue [since the] aircraft would not pressurize. Flight leveled off at FL100 to work [on] the issue. 94;000 lbs [of] fuel dumped for a return to ZZZ. An access door under nose [was] not secure [and] aircraft would not pressurize [as a result].
Dispatcher reported a B777 failed to pressurize resulting in a return to departure airport.