All aircraft variants of F-35 are currently within the Development Test phase of the overall programme. The aim of the Development Test phase is to reveal issues through testing so that solutions can be developed in order to deliver a capable aircraft to the armed forces.
The first fire was within the integrated power pack (IPP) and was due to an internal valve failure. Ground personnel extinguished the fire which resulted in minor aircraft damage. This incident lead to a minor design change.
The second fire was as a result of a hydraulic fluid leak onto a brake assembly following landing. Ground personnel extinguished the fire which resulted in minor aircraft damage.
The third fire was due to a hot brake condition after landing which was extinguished by ground personnel and resulted in a replacement of the wheel/tyre assembly.
Both brake fires remain under investigation with no immediate design change being considered as necessary.
The most recent fire occurred on