An engineer in the weapons bay prepares the pylon for loading tests. [ LMTAS photo]

Close-up view of the weapons pylon in the first F-35 production representative prototype, AA-1. [ LMTAS photo]

A Lockheed employee is working on the first F-35, AA-1. [ LMTAS photo]

J.D. Roberts, a Lockheed Martin engineer, inspects the JSF model during a break in aerodynamics load testing in the Propulsion Wind Tunnels 16-foot transonic wind tunnel at Arnold Engineering Development Center. [USAF photo by David Housch]

The F-35 Joint Strike Fighter program's Cooperative Avionics Test Bed, or CATB, aircraft lands here March 1, 2007, to perform equipment fit checks. The aircraft is a Boeing 737-300 specially modified to perform mission systems testing for the F-35 program. [Photo by Chad Bellay]
See also: F-35 JSF avionics test bed arrives at Edwards

The centre fuselage section for the first F-35 Lightning II short take-off, vertical landing (STOVL) variant static test aircraft. [Photo by Northrop Grumman]
See also: Center fuselage for F-35 Ground Test Aircraft delivered