Moon & Mars Orbiting Spinning Tether Transport - Tethers Unlimited

Appendix L: Tether Boost Facility Design Final Report3.2.1.2 Debris ToleranceThe system shall survive orbital debris impacts for 10 years with greater than 99%confidence.3.2.2 Maximum LifetimeConsumables and expendables shall not constrain the lifetime of the system.The system will not preclude resupply or addition of consumables and expendables,even after the design lifetime has been exceeded. The system may continue to operatebeyond its design lifetime with degraded performance. It should not become inoperablesimply because the system was not designed to allow some consumable or expendableitem, e.g. propellant, to be restocked.3.2.3 RepairabilityOrbiting elements of the system shall be repairable on orbit.3.2.4 EvolvabilityThe system shall be growable and evolvable on orbit to deliver a payload ten timesmore massive than the nominal payload to the nominal release orbit.3.2.5 DisposalThe system shall provide for safe disposal of all system elements.3.2.6 Fail OperationalThe system shall operate after any one credible component failure.3.2.7 Two-Failure SafetyThe system shall be safe after any two credible component failures.3.2.8 Collision Avoidance3.2.8.1 Tracked DebrisOrbiting elements of the system shall avoid collision with tracked debris that woulddiminish the system’s ability to perform its mission.The system may be designed to shield against or otherwise survive some debrisimpacts, thereby making avoidance unnecessary in some cases.3.2.8.2 Tracked SatellitesOrbiting elements of the system shall avoid collision with tracked satellites.3.2.8.3 Manned SpacecraftOrbiting elements of the system shall avoid collision with human-occupied spacecraft.This is a safety requirement, and therefore must be satisfied after any two crediblecomponent failures.L-44