LC-39A
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| LC-39A | |
|---|---|
| Name | Launch Complex 39A |
| Caption | A SpaceX Falcon Heavy on the pad in 2018. |
| Location | Kennedy Space Center, Merritt Island, Florida |
| Operator | NASA (1967–2014), SpaceX (2014–present) |
| Total launches | 163 (as of April 2024) |
| First launch | Apollo 4 (November 9, 1967) |
| Last launch | SpaceX Crew-8 (March 4, 2024) |
| Associated rockets | Saturn V, Space Shuttle, Falcon 9, Falcon Heavy |
LC-39A is a historic launch site at NASA's Kennedy Space Center on Merritt Island, Florida. Originally constructed for the Apollo program's massive Saturn V rocket, it was later modified to support the Space Shuttle fleet. Since 2014, the pad has been leased and operated by SpaceX, which uses it for launches of its Falcon 9 and Falcon Heavy vehicles, including critical missions to the International Space Station.
History
The site's construction began in the 1960s as part of the massive infrastructure build for the Moon landing ambitions of the Apollo program. It was first used for the uncrewed Apollo 4 test flight, a critical demonstration of the Saturn V. Following the conclusion of Apollo 17, the pad was reconfigured for the Space Shuttle program, hosting the inaugural shuttle mission, STS-1, commanded by John Young. For over three decades, it was the primary departure point for iconic missions like the launch of the Hubble Space Telescope and the assembly flights for the International Space Station. After the retirement of the Space Shuttle with STS-135, NASA sought commercial partners, leading to an exclusive lease agreement with SpaceX in 2014.
Design and infrastructure
The complex was designed around the Mobile Launcher Platform, which allowed the vertical assembly of rockets in the Vehicle Assembly Building before transport via the massive Crawler-Transporter. The pad itself features a large flame trench and deflector system to manage immense exhaust during ignition. Key structures include the Fixed Service Structure, which provided access and umbilical connections, and the Rotating Service Structure for payload protection. Under SpaceX, significant modifications were made, including the construction of a Hangar for horizontal rocket integration and the installation of a strongback-style Transporter Erector that allows the rocket to be raised vertically on the pad.
Launch operations
During the Apollo program, operations involved rolling the fully assembled Saturn V from the Vehicle Assembly Building days before launch. The Space Shuttle era followed a similar flow, with the orbiter mated to its External Tank and Solid Rocket Boosters before rollout. SpaceX introduced a markedly different operational tempo, utilizing pad-side hangars for rapid horizontal processing of the Falcon 9. This enables a faster turnaround, supporting a high launch cadence for NASA, commercial satellite deployments like Intelsat, and United States Space Force missions. The pad also supports the unique side-booster landing operations required for the Falcon Heavy.
Notable missions
This launch site has been the starting point for some of humanity's most significant spaceflight endeavors. It launched all the Saturn V rockets for the Apollo program, including the historic Apollo 11 mission carrying Neil Armstrong and Buzz Aldrin. The Space Shuttle Challenger disaster, STS-51-L, originated from here in 1986. It served as the primary shuttle pad for missions like the Hubble Space Telescope deployment and the final shuttle flight, STS-135. Under SpaceX, it launched the first crewed demonstration mission, Demo-2, restoring American crew launch capability, the first Falcon Heavy test flight carrying Elon Musk's Tesla Roadster, and numerous Crew Dragon flights to the International Space Station under the Commercial Crew Program.
Future use
The site is slated to play a central role in the next era of American space exploration. It is the designated launch site for the SpaceX Starship vehicle, which is being developed for missions to the Moon under NASA's Artemis program and for ambitious future goals like crewed missions to Mars. SpaceX is constructing a new launch mount and extensive support infrastructure to accommodate the super-heavy-lift rocket. These upgrades will ensure its continued status as a premier gateway for both commercial space activities and pivotal government exploration initiatives led by NASA and international partners.