The F-35 Joint Program Office has grounded a small number of newer F-35 Joint Strike Fighters in response to the Dec. 15 incident in which a hovering fighter crashed on a Texas runway and its pilot ejected.

In a statement to Defense News on Tuesday, the F-35 Joint Program Office confirmed it issued guidance as a result of the incident and that some higher-risk F-35s are grounded, at least until January. The JPO, which said the guidance was dated Tuesday, declined to specify how many F-35s are unable to fly.

“The F-35 Joint Program Office has issued a Time Compliance Technical Directive (TCTD) to restrict some aircraft, which have been evaluated to be of higher risk, from flight operations while the investigation into the mishap on December 15 continues and until procedures can be developed for their return to flight,” the JPO said. “The affected aircraft have been identified, and the JPO will work with the [U.S. military] services and [international] partners to ensure compliance with the TCTD.”

Video of the dramatic F-35B crash earlier this month at Naval Air Station Joint Reserve Base Fort Worth, Texas, and its pilot’s successful on-the-ground ejection quickly went viral on social media.

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