The Federal Aviation Administration (FAA) is widening its probe into Boeing and will now look into the manufacturing practices of a subcontractor used by the planemaker, it has announced.

In a Jan. 17 press release, the FAA said the probe into the planemaker will now be expanded to include Boeing subcontractor Spirit AeroSystems, which is based in Wichita, Kansas.

“After taking decisive action to ground 171 Boeing 737-9 MAX airplanes, the FAA is now investigating Boeing’s manufacturing practices and production lines, including those involving subcontractor Spirit AeroSystems, bolstering its oversight of Boeing, and examining potential system change,” the agency said.

Spirit AeroSystems, which describes itself as “the world’s largest tier-one manufacturer and supplier of aerostructures for premier commercial and defense aerospace programs” made the plane fuselage in the Jan. 5 Alaska Airlines flight, which had its door blow off.

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