During the peak summer travel period, a domestically produced C909 regional passenger aircraft was seen parked steadily at Gate 203 on the tarmac of Nanchang Changbei International Airport. As the boarding bridge docking port connected precisely with the aircraft cabin door, passengers were able to board in an orderly fashion via the bridge without needing shuttle buses to reach the remote stands. The routine implementation of this scenario marks the full completion of the airport's independent upgrade project to adapt boarding bridges for the C909 model, representing a substantial enhancement in the airport's ground support capabilities for domestically manufactured aircraft. To date, three boarding bridges have achieved routine docking for C909 aircraft, raising the proportion of adaptable bridges to 24%, which is higher than the 15% daily flight share of this aircraft model, effectively improving the margin for docking support of domestic aircraft at bridges.

The less-than-one-meter "height difference" has long restricted C909 boarding bridge support. As an independently developed regional passenger aircraft, the C909 accounts for 15% of flight share at Nanchang Airport, yet most of its flights could only be assigned to remote stands. Passengers had to take shuttle buses to and from the terminal, which not only affected their travel experience but also increased ground support scheduling costs and operational pressure. The core reason existing boarding bridges cannot directly accommodate the C909 stems from the height gap of less than one meter. Currently, the boarding door of the Boeing 737 model, the airport's mainstream aircraft, sits at approximately 2.7 meters above ground, while the Airbus A320 stands at about 3.2 meters; both fall within the standard docking height design range of existing bridges, enabling safe connection. In contrast, the C909, as a regional model, has a lower fuselage height with its boarding door only about 2.2 meters off the ground, nearly one meter lower than the Airbus A320 and below the conventional lower limit of the bridge docking port's height adjustment. Adding to the complexity are the constraints imposed by the fuselage structure. The C909 has protruding components such as pitot tubes positioned beside the cabin door, further compressing the already narrowed safety margin caused by the height difference. Under standard docking modes, the bridge cannot directly connect due to limitations in docking port height, slope, and safety redundancy parameters. Without adaptive retrofitting, the existing bridges would be unable to support the C909 model.

Through meticulous validation and clever use of clearances, three customized retrofits overcame the technical barriers. The Terminal Management Department of Nanchang Airport led the adaptation project. Before the retrofit began, the team systematically reviewed the mechanical, hydraulic, and electrical control parameters of all bridges across the airport, held multiple discussions with Beijing Bowei Aviation Facilities Management Co., Ltd. and technical experts from the bridge equipment manufacturers, and communicated with other domestic airports already operating C909 services to learn about mature industry solutions and implementation paths. Research indicated that similar retrofits in the industry typically adopt an outsourced construction model, where the original manufacturer or a third-party team carries out customized implementation at higher costs, with overall project cycles generally around one month. "What others can do, we can do too, and we aim to do it better," the technical staff said. Building on thorough research, they conducted on-site measurements of the bridge's lifting columns, docking frames, and slope limiting devices one by one, verifying every parameter affecting docking, and ultimately concluded that, under strict compliance with civil aviation safety regulations and ensured structural load-bearing standards, certain bridges possessed the technical space for independent retrofitting. In early June 2026, the Terminal Management Department formally established a special task force and launched the independent upgrade project. The team focused on the C909's model characteristics and implemented three customized modifications. First, the docking port canopy was remodeled to fit the C909's fuselage curvature. Second, the slope limit was optimized to fundamentally eliminate the safety hazards of fuselage scraping and compression, allowing the bridge to safely lower to a docking height suitable for the C909. Third, the bridge-mounted air conditioning duct cart structure was modified and its operating trajectory optimized, with PLC program debugging carried out simultaneously during the process. To avoid disrupting normal daytime flight operations, all hardware modifications and debugging were scheduled during flight gaps. Technical staff calibrated precision point by point and advanced the retrofit milestones on a daily basis. The entire project went through four stages in sequence—hardware modification, simulation testing, calibration and tuning, and real aircraft docking trials—completing all set tasks with high quality within 18 days.

Multi-dimensional cost reduction and efficiency gains have solidified technical expertise. Completing the hardware retrofit was only the first step; safety verification served as the ultimate benchmark. The project team strictly followed civil aviation equipment acceptance specifications, conducting comprehensive settlement performance tests on the retrofitted bridges, continuously collecting static and dynamic operational data, and verifying settlement, levelness, and stability. Multiple rounds of validation results showed that all data fell within the safe specification allowances, with the bridge structures remaining stable, operating smoothly, and showing no abnormal settlement or vibration. Subsequently, the Terminal Management Department coordinated with resident airlines to carry out dedicated real aircraft docking verification. The moment the bridge connected smoothly with the C909 fuselage, the anxiety of everyone on site finally subsided. This independent retrofit achieved notable results across three dimensions. In terms of cost control, the project relied on the in-house technical team for independent design and construction, incurring only minimal direct costs for materials and components; compared to the outsourced construction model, it saved approximately 100,000 yuan in outsourcing costs, representing an overall cost reduction of 90%. In terms of schedule efficiency, the independent retrofit offered greater schedule controllability, taking only 18 days from launch to completion and being fully operational before the peak summer season, releasing more bridge docking resources for busy-period flight support. In terms of technical capability, the technical team accumulated comprehensive experience in the full process of C909 adaptation retrofits through hands-on practice, cultivating a skilled team that understands aircraft models, equipment, and processes. Future maintenance and optimization of similar facilities can achieve independent rapid response, offering advantages in both long-term maintenance costs and response efficiency.

From shuttle bus transfers at remote stands to direct boarding via bridges, and from reliance on external solutions to independent completion of retrofits, Nanchang Airport has filled the gap in boarding bridge support for domestic regional passenger aircraft through an 18-day intensive effort. Moving forward, Nanchang Airport will continue to improve dedicated support equipment and the full-process support system for the C909 model, enabling more passengers to depart from boarding bridges and enjoy the comfort and convenience of domestically produced aircraft.