The USA they issued an emergency decision, according to which all fighters are grounded F-35because a problem occurred securitymaking them unable to fly.
In accordance with Breaking Defense who disclosed the news, the representative of the US Air Force, Alexi Worleyreported that a technical problem was found in the ejection seat, resulting in a serious risk to the pilot’s life.

Thus, the ACC (Air Combat Command) of the USAF announced that it is grounding all of its F35s, due to possible problems in the ejection seats them and more specifically the CAD units (Cartridge Actuated Device) they have integrated.
Specifically, it was detected defective part in the ejection mechanism, a device which is activated by the pilot in an emergency and ejects the seat from the cockpit.
Source: News Beast

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