The F-35 Joint Program Office has cleared F-35 fighters for flight operations, but the US Air Force’s test jets at Eglin Air Force Base, Florida, US, will remain grounded until continuing investigations are completed.

The Eglin test F-35s are under investigation following the AF-4’s integrated power package (IPP) failure, which led to the grounding of the aircraft fleet.

A release from the F-35 Joint Program Office states, “The root cause investigation indicates that an IPP valve did not function properly.

“Monitoring of valve position is a mitigating action to allow monitored operations. A permanent resolution is in work.”

The F-35 IPP is a turbo-machine that provides power to start the engine and generates cooling for the aircraft, while AF-4 is the fourth conventional take-off and landing variant of the F-35 aircraft produced by Lockheed Martin.

How well do you really know your competitors?

Access the most comprehensive Company Profiles on the market, powered by GlobalData. Save hours of research. Gain competitive edge.

Company Profile – free sample

Thank you!

Your download email will arrive shortly

Not ready to buy yet? Download a free sample

We are confident about the unique quality of our Company Profiles. However, we want you to make the most beneficial decision for your business, so we offer a free sample that you can download by submitting the below form

By GlobalData
Visit our Privacy Policy for more information about our services, how we may use, process and share your personal data, including information of your rights in respect of your personal data and how you can unsubscribe from future marketing communications. Our services are intended for corporate subscribers and you warrant that the email address submitted is your corporate email address.