The latest problem with the F-35 Joint Strike Fighter? There might be something seriously wrong with the gold-plated aircraft’s brain.

A Government Accountability Office report released Thursday raises concerns about the jet’s $16.7 billion Autonomic Logistics Information System (ALIS). The software is essentially the brain that enables the fifth-generation warplane to operate, tracking everything from the amount of time the aircraft spends in the air to when the engine needs a tune-up.

The roughly $400 billion F-35 effort has had more than its share of software hiccups already, highlighted by recent findings that the aircraft’s billions of lines of computer code might be vulnerable to hacking.

If the bugs persist, it could have a cascading effect on the rest of the Defense Department’s timeline for the warplane, which is already years behind schedule. Serious problems with the logistics system could delay important program milestones, including the U.S. Air Force declaring its version of the jet ready for deployment later this year.

Read More: The Fiscal Times

Featured Image – The Fiscal Times