https://www.defensenews.com/air/2024...me-in-4-years/
F-35A Lightning cleared to fly in lightning for first time in 4 years
The Air Force’s version of the F-35 Joint Strike Fighter
can fly in lightning and thunderstorms again after the service lifted a restriction that had been in place for four years.
The F-35 Joint Program Office confirmed in an email that the 2020 standoff restriction placed on the aircraft, officially called the Lightning II, was lifted on March 19…..
The military stopped F-35As from flying within 25 miles of lightning after a problem was discovered with its
Onboard Inert Gas Generation System, or OBIGGS, which is meant to keep the jet safe from strikes. OBIGGS pumps nitrogen-enriched gas into the F-35′s fuel tank to render it inert, and keep the fuel tanks from exploding if struck by lightning.
In 2020, maintainers conducting depot maintenance on an F-35A at Hill Air Force Base in Utah found that one of the tubes that distributes the gas to the fuel tank was damaged. Subsequent inspections found problems with tubes in multiple other F-35s, and the military restricted it from flying near lightning until a fix could be developed.
F-35Bs and Cs were not affected by the lightning problem and did not have their flying restricted……
The JPO said the fix included “a more robust” design for the fighters’ OBIGGS hardware, as well as updates to its software. The modification was tested both in the lab and in flight…..
The JPO declined to further detail how the system was fixed, or how many F-35As have been modified, due to operational security concerns…..