(2/2) — The FAA ✈️ (@FAANews) January 11, 2023ABC has more details; apparently, an engineer inadvertently replaced a file with an incorrect one during some maintenance done overnight. abcnews.go.com/...x BREAKING: This morning’s catastrophic FAA computer failure was likely caused by a mistake made during routine maintenance. @JoshMargolin pic.twitter.com/xymxgyETkr — Sam Sweeney (@SweeneyABC) January 11, 2023Also, the NOTAM system is antiquated and is due for a replacement. Had the FAA’s new NOTAM system been in place, redundancies would likely have stopped the cascading failures. See this diary earlier today for more details of the outage this morning — Major FAA Outage.

Source: ABC News January 12, 2023 14:35 UTC