From Fortune:

US aviation regulators impose new requirements on Boeing Co. prior to 737 Max 9 jets returning to service following a recent accident. The FAA asked Boeing to provide additional data before it approves inspection and maintenance procedures for airlines. Boeing declined to comment on the additional requirements.

Following a recent incident, Boeing is facing mounting scrutiny from regulators. Preliminary inspections by United Airlines Holdings Inc and Alaska Air Group Inc found loose bolts on some aircraft. The FAA has launched a formal probe into Boeing’s manufacturing operations. Carriers are still awaiting the FAA’s approval to resume flights with the Max 9 jets.

The FAA is reinforcing its oversight of Boeing and its manufacturing operations after a recent incident. This has led to the grounding of hundreds of flights, and carriers are awaiting FAA approval to resume flying the Max 9 jets. Boeing’s latest crisis is fueling concerns about the safety of the aircraft.



Read more: FAA hardens 737 Max 9 stance, demands more Boeing data