The first flight of Boeing’s 787 Dreamliner has been delayed to reinforce a side section of the aircraft.

The need for reinforcement was identified during the scheduled tests on the full-scale static test airplane.

Meanwhile other tests on the first 787, such as final gauntlet testing and low-speed taxiing, will continue. Work on the other five test planes will also continue.

Boeing Commercial Airplanes president and CEO Scott Carson said that the structural modifications such as this are not uncommon.

“This is not an issue related to our choice of materials or the assembly and installation work of our team,” he said.

The new composite jetliner will consume 20% less fuel than other similar-sized planes flying at an average speed of Mach 0.85.

The first flight and delivery of the aircraft will be rescheduled after ascertaining the modification needed and a new test plan.