The first launch from SLC-40 was the maiden flight of the Titan IIIC, carrying two transtage upper stages to test the functionality of the vehicle. Two interplanetary missions were launched from the pad:
On April 25, 2007, the US Air Force leased the complex to SpaceX to launch the Falcon 9 rocket. During April 2008, construction started on the ground facilities necessary to support the launch of the SpaceX Falcon 9 rocket. Renovations included installation of new liquid oxygen and kerosene tanks and construction of a hangar for rocket and payload preparation. The spherical liquid oxygen tank was acquired from NASA. This LOX tank was previously used at LC-34. The first Falcon 9 rocket arrived at SLC-40 in late 2008, and was first erected on January 10, 2009. It successfully reached orbit on its maiden launch on June 4, 2010, carrying a dummy payload qualification unit. SLC-40 is the launch facility of the SpaceX Dragon 2, a reusable automated cargo vehicle which is currently being used to provide two-way logistics to and from the International Space Station; a role previously filled by the Space Shuttle until its retirement in 2011. SpaceX successfully launched the first test flight for the Dragon 1 from SLC-40 on December 8, 2010. Its first attempt to launch to and dock with the International Space Station successfully occurred on May 22, 2012, following an abort after engine ignition three days earlier. SpaceX modified the launch pad in 2013 in order to support launches of the Falcon 9 v1.1 launch vehicle, a 60 % heavier rocket with 60 % more thrust on realigned engines and 60 % longer fuel tank than the v1.0 version of the Falcon 9, requiring a modified transporter/erector.
Accidents and incidents
On September 1, 2016 a Falcon 9 rocket was destroyed by an explosion that originated around the rocket's second stage while preparing for a routine static fire test on the SLC-40 launch pad. The explosion occurred during loading of liquid oxygen eight minutes prior to igniting the first stage engine as part of the test. A static fire is a test performed prior to launch to verify that both the launch vehicle and the ground systems are ready for flight. The test is identical to a launch until the moment of liftoff but instead of releasing the vehicle shortly after first stage engine ignition, the engines fire for a few seconds and then shut down. The second stage is fueled to test the interaction with the first stage and ground systems but remains otherwise inactive. After completion of a static fire test, the propellant and oxidizer are unloaded, the launch vehicle is lowered and the launch vehicle is returned to the hangar pending review and analysis of the data from the static fire test. Static fire tests are not common for most rocket launches and most proceed without one. SpaceX performs static fire tests to ensure that ground systems, as well as the launch vehicle, will perform nominally. The static fire explosion resulted in the total loss of the rocket. The rocket's payload, the Amos-6 satellite, was on-board and was also destroyed. In addition, the explosion resulted in extensive damage to the launch pad. It was reported to have cracked nearby windows and to have been felt up to 40 miles away. There were no personnel on the pad and no injuries from the explosion were reported. Repairs to and modernization of the launch pad began in early 2017 following completion of accident investigation and environmental cleanup. SLC-40 returned to service with the launch of CRS-13 on 15 December 2017. The pad was reportedly in good condition after the launch. The initial launch of a Falcon Heavy from pad 39A was contingent upon the successful reactivation of pad 40. Resumed launches from pad 40 freed up pad 39A for needed final modifications without affecting the SpaceX launch tempo.
