Airbus has indicated that the 460-seat layout for the Cebu Pacific A330-900s will involve a door modification in order to achieve exit limits.
The European Union Aviation Safety Agency's type certificate for the aircraft shows that it is approved for a maximum seating capacity of 440.
This requires the A330-900 to be fitted with four pairs of Type A exits. Airbus says these provide emergency exit capability for 110 passengers.
But FlightGlobal understands that Airbus is developing a 'Type A-plus' exit for the A350, which increases this figure to 120.
The A330-900 would have the modified exits installed at the 'door 2' and 'door 4' positions, hiking the authorised capacity.
Airbus has not indicated whether an evacuation test, or simulated evacuation, would be required to validate the change.
Cebu Pacific is due to take delivery of its first 460-seat A330neo in 2021. The airline is taking 16 of the Rolls-Royce Trent 7000-powered type.