Interim Control Module
unused ISS space station module
The Interim Control Module (ICM) is a NASA-constructed module designed to serve as a temporary "tug" for the International Space Station in case the Zvezda service module was destroyed or not launched for an extended period of time.
History
It was derived from a formerly classified Titan Launch Dispenser used to distribute reconnaissance satellites to different orbits. It would have been able to prolong the lifespan of the Zarya module by providing equivalent propulsion capabilities to the Service Module, although not any of the other life support capabilities.
In 1997 NASA requested that the Naval Research Laboratory study the feasibility of adapting an existing, heritage spaceflight system to provide low-cost, contingency propulsion operations for the International Space Station (ISS).
After determining that the system could be adapted in time to meet NASA's schedule requirements, NRL was granted authority to proceed with the Interim Control Module (ICM). From its inception ICM was a contingency option for attitude control and reboost of the ISS that would allow NASA to preserve the on-orbit construction schedule in case of delays in the launch of the Russian Service Module.
ICM was to launch on board the Space Shuttle, deploy from the Shuttle's cargo bay, and mate with the ISS at the Russian Control Module (called Zarya). Once on orbit ICM would provide sufficient fuel for one to three years of operation.
After the successful launch of Zvezda, ICM was placed in a caretaker status at NRL's Payload Processing Facility in Washington, D.C. Should it become necessary to complete and launch ICM, it was estimated that it would take between two and two-and-a-half years to do so.
Since the ICM was mothballed, a variety of new uses for it have been proposed.
The public source identifies “Interim Control Module” as unused ISS space station module. This brief keeps that definition visible, then builds a research path around Interim, Control and Module.
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The strongest evidence will usually combine a dated visual record with documents produced by the authority responsible for the place. The source revision retrieved here is dated Dec 25, 2025. The linked authority identifier is Q221720. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1997.
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This entry incorporates text from “Interim Control Module” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.