The US military has grounded its entire fleet of F-35 fighter jets in the wake of a crash in South Carolina last month.
Inspections are to be carried out on faulty fuel tubes.
An official report questioned earlier this year whether the F-35 was ready for combat after dozens of faults were found.
The F-35 is the largest and most expensive weapons programme of its type in the world.
The plane has been sold to a number of countries, including the UK and Japan.
It was first used in combat by Israel earlier this year to carry out two strikes.