Boeing still has to make “significant changes” to improve the quality and safety of its airplanes, according to the head of the Federal Aviation Administration.

The head of the Federal Aviation Administration will tell Congress on Tuesday the agency will hold Boeing accountable to ensure the planemaker is building safe airplanes and will revamp its own safety management program.

Changes to Boeing’s safety culture will take years but the company has made helpful shifts in the short-term, the FAA administrator told lawmakers.

Boeing must do more to improve the aircraft safety following a door plug blowout in January and other mishaps, Federal Aviation Administration Administrator Mike Whitaker told a House committee Tuesday.

The head of the Federal Aviation Administration told a U.S. House subcommittee on Tuesday that safety culture improvements at Boeing may take three to five years to complete. "It is not a six-month program - it is a three-year to five-year program,

Boeing Co. will need three to five years to rebuild its safety culture that regulators have found to be rife with shortcomings, the top US aviation safety official said.

Boeing will need three to five years to revamp its safety culture improvements. The administrator for the Federal Aviation Administration, Michael Whitaker, testified before a house panel on Tuesday.