Boeing said on Wednesday that it was suspending 737 MAX test flights while CFM International, an engine venture co-owned by Safran and General Electric, conducted checks after a quality problem was found in a turbine disc.

The French engine maker is scrambling to transport dozens of engine turbines back from the United States, only days before Boeing had been due to start deliveries of the new 737 MAX.

The problem is not related to the part’s design and does not suggest deeper problems in the industry’s tightly stretched supply chain, Safran Aircraft Engines’ Chief Executive Olivier Andries told reporters.

“There will be a temporary disruption to the logistics, which we hope to fix within a few weeks,” said Andries at a French factory where production is being ramped up to meet demand for the LEAP engine. A similar factory is based in Ohio.

The LEAP-1B engine is produced for Boeing. A LEAP-1A model made for Airbus A320neo jets is not affected, Andries said.

CFM’s shareholders said last month that between 450 and 500 LEAP engines are expected to be delivered this year rather than the previously stated 500.

Andries said production of engines would not be affected because a second supplier for the same part was boosting its supplies. CFM aims to deliver “as close as possible to 500” in total for Boeing, Airbus and China’s COMAC, he said.

Still, Safran’s share price was dented by the renewed focus on ambitious production schedules that had previously suffered barely a glitch.

Picture Rob Vogelaar