Boeing still needs to do more to win back the ability to certify the airworthiness of its aircraft and other powers the aviation giant lost after a series of manufacturing lapses, according to the head of the U.S. Federal Aviation Administration.

“They need to do more and we’re working with them to help them get where they need to go,” FAA Administrator Bryan Bedford said in Singapore on February 2, at an industry conference ahead of Asia’s largest air show. Still, Boeing is making “great progress,” he said.

Though Boeing has regained some powers in recent months, the comments illustrate how the company continues to face U.S. regulatory scrutiny, years after a near-catastrophic accident exposed sloppy workmanship at its factories. 

Bedford said he is seeking to ultimately transfer full responsibility of final safety checks to Boeing, and redeploy his staff deeper into the planemaker’s production facilities.

The FAA routinely delegates tasks to manufacturers under so-called Organization Designation Authorization programs to help stretch its scarce resources. The programs allow the companies to perform certain oversight functions that would normally be carried out by the regulator.

Improvements at Boeing has enabled the the planemaker to raise output of its 737 Max cash-cow to 42 planes a month, marking a key milestone after output was capped at 38.