The video was filmed during a ground test at Edwards Air Force Base, Calif., Gun Harmonizing Range on Aug. 14; initial shots were fired on Jun. 9 and ground testing should be completed by the end of this month. Airborne testing is to start in the fall and at the end of the firing campaign the gun will be operative by 2017.
According to LM, the F-35 flight sciences aircraft, AF-2, underwent instrumentation modifications and used a production version of the GAU-22/A gun to achieve the full capacity of 181 rounds: along with practice PGU-23/U target practice rounds (which do not explode on impact) software to replicate being in flight was uploaded to the aircraft to conduct the test.
The F-35 GAU-22/A gun has been among the most controversial topics lately: some criticised the fact that the Joint Strike Fighter’s gun can only hold 181 20mm rounds, fewer than the A-10 Thunderbolt’s GAU-8/A Avenger, that can hold some 1,174 30mm rounds.
Interestingly, the gun is hidden behind closed doors, to reduce the plane’s RCS (radar cross section) and keep it stealth, until the trigger is engaged.
While the F-35A will be equipped with an embedded GAU-22 gun, the B (STOVL – Short Take Off Vertical Landing) and C (CV – Carrier Variant) variants will carry it inside an external pod capable to hold 220 rounds.
F-35A firing its 25mm gun at full capacity.