External stowage platform

Each platform is made from steel[citation needed] and serves as an external pallet that can hold spare parts, also known as orbital replacement units (ORUs), for the space station.The first of the external stowage platforms, called ESP-1, was installed on the port side trunnion pin on the outer hull of the Destiny Laboratory Module on March 13, 2001 during the second EVA of the STS-102 Space Shuttle mission.ESP-1 holds the following ORUs:[3] ESP-2 was detached from its Keel Yoke Assembly (which remained in the Orbiter) and installed with the assistance of Space Shuttle Discovery's robotic arm and two spacewalkers during the STS-114 mission.The ORUs on ESP-2 are: Notes: ESP-3 was detached from its Keel Yoke Assembly (which remained in the Orbiter) and installed on the P3 Truss at UCCAS-1 on August 14, 2007 during the Space Shuttle STS-118 mission.It has seven attachment sites for ISS spare parts and assemblies, called Orbital Replacement Units (ORUs).
ESP-3 framework
FRAM breakdown
Location of ESPs on the International Space Station [ 1 ]
STS-102 ICC carrying ESP-1 on its underside
Multi-plane view of ESP-1
ESP-2 in launch configuration with yoke
ESP-2 updated FRAM ORUs
ESP-3 launch configuration (with yoke)
ESP-3 ORU locations ISS Exp 38
ISS truss components and ORUs in situ
International Space Stationorbital replacement unitsIntegrated Cargo CarriersSTS-102STS-114STS-118Destiny Laboratory ModuleSpace ShuttleUnity ModuleIntegrated Cargo CarrierSTS-100Quest Joint AirlockSTS-123STS-120CRS 12STS-121STS-133STS-135STS-122CRS 15grapple fixturesP3 truss segmentS3 truss segmentExPRESS Logistics CarrierSTS-134STS-126STS-127STS-124Canadarm2Scientific research on the ISSRussian SegmentPrichalRassvetZvezdaUS SegmentColumbusCupolaDestinyHarmonyLeonardoQuest airlockTranquilityBishop airlockElectrical SystemEuropean Robotic ArmExternal Stowage PlatformsExPRESS Logistics CarriersInternational Docking AdaptersIntegrated Truss StructureLife Support SystemMobile Servicing SystemDextreBoom AssemblyPressurized Mating AdaptersStrelaWindow Observational Research FacilityAMS-02ISS-CREAMPK-3 PlusSAGE IIIUS Deorbit VehicleMulti-Purpose Logistics ModulesInterim Control ModuleNode 4Propulsion ModuleCentrifuge Accommodations ModuleHabitation ModuleCrew Return VehicleScience Power PlatformUniversal Docking ModuleRussian Research ModuleScience Power ModuleManufacturing of the ISSAssembly of the ISS