"In this scenario, we know the exact issue", Harrison said, "and guidance has been provided to complete the inspections", which Harrison said are ongoing.
"At this time, the cause of the mishap has not yet been determined", said Capt. Christopher Harrison, a U.S. Marine Corps spokesman.
Britain was forced to ground all 16 of its new F-35 fighter jets after the U.S. government discovered that a faulty fuel tube was behind a crash last month.
While its costs per aircraft are coming down there are still questions about how many planes the U.S. can afford and whether it should also buy a cheaper, less capable aircraft alongside the F-35.
Inspections were expected to be completed within 24 to 48 hours. If the aircraft has good fuel tubes, it will be allowed to begin immediately flying again.
The F-35 program is considered to be the most expensive weapons system in United States history.
It will equip the US Air Force and Marine Corps as well as several of Washington's allies.
Flight operations for the strike fighter have been temporarily suspended as the military conducts a fleet-wide inspection of a fuel tube within the engines of all F-35 aircraft, a Pentagon spokesman told Task & Purpose. During the subsequent investigation, certain fuel tubes were identified as a potential problem, largely involving aircraft built before 2015.
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The temporary suspension of flight operations will also impact global partners, such as Israel, that have the F-35.
In the September 28 crash in SC near the Marine Corps Air Station Beaufort, the pilot safely ejected from the aircraft, which belonged to 2nd Marine Aircraft Wing, Marine Fighter Attack Training Squadron 501, known as the "Warlords".
Smoke bellows from a military jet that crashed, Friday, Sept. 28, 2018 in Beaufort, S.C. "We will take every measure to ensure safe operations while we deliver, sustain and modernize the F-35 for the warfighter and our defense partners".
The F-35 grounding also comes a day after a Senate Armed Services Committee subpanel hearing on Air Force readiness that included the F-35.
An official report questioned earlier this year whether the F-35 was ready for combat after dozens of faults were found. If the aircraft has those particular tubes, they will be replaced.
"And yet for the F-35 that's a new airplane coming online, coming out into the fleet ... in the mid-60s", he said.
Sullivan asked whether the F-35 could hit an 80 percent readiness mark within a year. The US government's accountability office estimates all costs associated with the project will amount to one trillion dollars. "And it's going to be hard to achieve those kinds of mission capability rates".