Kennedy Space Center Launch Complex 39B

Kennedy Space Center Launch Complex 39B
NASA/Joel Kowsky · Public domain · source
Name	Launch Complex 39B
Location	Kennedy Space Center, Brevard County, Florida
Operator	NASA
Pad	LC-39B
Built	1965
First launch	1975
Coordinates	28°36′53″N 80°36′50″W

Kennedy Space Center Launch Complex 39B is a launch pad at Kennedy Space Center on Merritt Island, Florida that has supported a succession of heavy-lift and crewed launch vehicles. Originally constructed for the Apollo program, the pad has been adapted for operations by Space Shuttle, Ares I, Constellation program, Space Launch System, and commercial providers. LC‑39B's infrastructure, proximity to Vehicle Assembly Building and Launch Control Center, and seaside orientation have made it central to United States human spaceflight efforts.

Overview

Launch Complex 39B is one of two pads in Launch Complex 39 alongside Launch Complex 39A and sits within the John F. Kennedy Space Center property near Cape Canaveral Space Force Station. The pad's layout integrates the Mobile Launcher concept, flame trench, hold-down structure, and water sound suppression systems used during Apollo program operations and later modified for Space Shuttle and Space Launch System (SLS) missions. Its location provides safety margins for trajectories to Low Earth Orbit, Geostationary Transfer Orbit, and translunar injection missions associated with Artemis program and past Apollo 11 objectives.

History

Construction of LC‑39B began under direction of the Marshall Space Flight Center and NASA civil servants to support the Saturn V during the Apollo program. The pad's first operational launches included uncrewed and crewed missions in the late 1960s and 1970s that contributed to the Apollo–Soyuz Test Project era and later supported Skylab contingency planning. Following the conversion for Space Shuttle operations in the 1980s, LC‑39B hosted numerous missions including STS-1 preparations and later flights. After the Columbia disaster and the Space Shuttle Columbia disaster investigation recommendations, LC‑39B underwent safety and infrastructure changes. Post‑Shuttle retirement, the pad was modified for the Constellation program's Ares I before reconfiguration for Orion and Space Launch System. The pad has also been earmarked for commercial launches involving providers like Sierra Nevada Corporation and Boeing concepts during public–private development phases.

Design and Facilities

LC‑39B features a reinforced concrete pad, flame trench and deflector system shared conceptually with Launch Complex 39A, an adjustable exhaust duct, and a water sound suppression system originally designed by contractors including Boeing and North American Aviation. The pad interfaces with the Vehicle Assembly Building via the crawlerway used by the Crawler-transporter and includes lightning protection towers similar to those at Cape Canaveral Air Force Station sites. Ground support equipment rooms, umbilical connections, and the expanded mobile launcher platforms were engineered to accommodate Saturn V, Space Shuttle External Tank, and later SLS core stages and solids. Ancillary facilities include proximity to the Payload Hazardous Servicing Facility and coordination with Launch Control Center consoles.

Launch History and Missions

LC‑39B supported key Apollo program launches and was involved in launches associated with Skylab planning. During the Space Shuttle program, the pad was used for select STS missions when operational needs required both pads. Notable historical context includes pad readiness for the initial STS-1 era and contingency launches tied to Apollo–Soyuz Test Project logistics. In the post‑Shuttle era, the pad's launch manifest evolved toward Orion and Artemis mission integration, with LC‑39B planned for Artemis IV and other SLS flights. The pad has also been proposed for heavy-lift commercial missions and possible international cooperative payloads involving partners like European Space Agency and Japan Aerospace Exploration Agency.

Modifications and Upgrades

Major modifications have included removal of the original Saturn V umbilical towers, installation and later removal of Space Shuttle fixed and retractable structures, and construction of convertible support infrastructure for Ares I and SLS. Upgrades encompassed modernization of propellant lines, cryogenic fueling interfaces compatible with liquid hydrogen and liquid oxygen systems used by modern core stages, reinforcement of the flame trench, and revised sound suppression and water deluge capacity following Columbia disaster safety recommendations. The pad has received avionics, telemetry, and command link enhancements to interface with the Launch Control Center and telemetry networks used by United Launch Alliance and other providers when contracted.

Operations and Ground Support

Operational control of LC‑39B is coordinated through the Launch Control Center and integrates mission management from NASA Headquarters program offices, technical direction from Marshall Space Flight Center, and logistics support from contractors including Hensel Phelps and aerospace firms. Ground support involves propellant loading operations, hazardous processing in coordination with the Kennedy Space Center Operations and Checkout Building, environmental monitoring by Florida Department of Environmental Protection partners, and range safety oversight by Eastern Range. The pad uses the Crawler-transporter system to move mobile launchers from the Vehicle Assembly Building to the pad and relies on range instrumentation from installations used historically by Cape Canaveral Space Force Station.

Future Plans and Proposed Uses

LC‑39B is planned as a primary pad for Space Launch System flights supporting the Artemis program lunar cadence and is under consideration for future deep‑space missions including Earth–Moon Lagrange point operations and crewed missions beyond Low Earth Orbit. Proposals include mixed usage between NASA SLS launches and commercial heavy‑lift vehicles developed by firms such as SpaceX and Blue Origin in cooperative or leased arrangements, as well as potential international partnership launches with Canadian Space Agency payloads. Continued upgrades are slated to improve pad reusability, reduce turnaround time, and expand compatibility with cryogenic and reusable stage architectures championed by contemporary aerospace firms.

Category:Kennedy Space Center Category:Launch complexes