Washington (CNN) Maintenance of explosive detecting scanners and x-ray machines at the U.S. airport security checkpoints are not being managed properly, according to a new government report. And the Department of Homeland Security can't even definitively say they are all working properly.

"(The Transportation Security Agency) is not properly managing the maintenance of its airport screening equipment," according to an inspector general report.

The equipment is used at about 450 airports nationwide to detect everything from explosives, to guns and other weapons passengers or terrorists may try to get past security checkpoints.

JUST WATCHED Report: TSA let domestic terrorist through pre-check Replay More Videos ... MUST WATCH Report: TSA let domestic terrorist through pre-check 02:53

Each day, TSA screens about 1.8 million airline passengers and about 1.2 million checked bags for anything that could bring down an airplane.

Read More