Xin Jing Bao·2025-07-21 10:08Core Points - On July 20, China Eastern Airlines flight MU735 returned to Shanghai due to a maintenance issue related to the landing gear pin not being removed, leading to fuel dumping [2][5] - The flight, operated by an Airbus A350-900, circled over the Yangtze River estuary before returning to Pudong Airport after approximately 3 hours and 33 minutes of delay [5][6] - The airline arranged for passengers to take a subsequent flight to Sydney after the incident [5] Industry Insights - The landing gear pin is a critical item in pre-flight checks; if not removed, it can prevent the landing gear from retracting, potentially triggering instrument system alarms [5] - For the Shanghai to Sydney route, the Airbus A350-900 requires approximately 90 tons of fuel, considering aircraft performance, distance, fuel efficiency, and safety regulations [6] - The estimated fuel cost for the fuel dumped during the return flight is around 250,000 RMB, in addition to airport service fees and compensation for flight delays, indicating significant direct economic losses [7]