Bulkheads, bulkheads...a kingdom for the bulkheads.
Meanwhile, Bogdan also says he is worried about the integrity of the F-35B’s aluminium 496 bulkhead, which bears critical structural loads where the trailing edge of the wing attaches to the aft fuselage. In 2004, programme officials reduced the weight of the F-35B by about 1,360kg (3,000lb). Those changes included switching the bulkhead material from titanium to lighter-weight aluminium.
The lighter bulkhead has since proved susceptible to structural cracking, requiring a series of “patches” all over the 496 bulkhead. There are now so many patches that programme officials are concerned it may be necessary to redesign the bulkhead for production aircraft, Bogdan says.