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ECSS Terms and Definitions

Terms and Definitions from the active ECSS Standards
(data as of 1 June 2015)

- The search looks for the entered term in all columns.
- Special characters can be shown distorted or are missing
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The reference version of the Terms and Definitions is the published ECSS Standard.

Document Number Clause Clause Title Context Definition Notes
ECSS-Q-ST-60-14C 3.2.21 (final) package <general> container holding one or more intermediate packages, used for transportation of supplies to the orderer
ECSS-Q-ST-60-14C 3.2.20 (intermediate) package <general> container holding two or more primary packages
ECSS-Q-ST-60-14C 3.2.5 (original) date code <general> code used by the EEE part manufacturer at assembly step that indicates the production date
NOTE 1 Generally four-figure codes; two for the year and two for the week.
NOTE 2 Special lot number can also identify the date code.
ECSS-Q-ST-60-14C 3.2.19 (primary) package <general> container, envelope or wrap holding an individual item
ECSS-E-ST-32C Rev. 1 3.2.42 (quasi) static loads <general> loads independent of time or which vary slowly, so that the dynamic response of the structure is not significant
ECSS-Q-ST-60-14C 3.2.6 (relifing) date code: <general> code indicating the date an item is submitted to relifing
NOTE Four-figure code, two for the year and two for the week.
ECSS-M-ST-80C 3.2.2 (risk) communication <general> all information and data necessary for risk management addressed to a decision-maker and to relevant actors within the project hierarchy
ECSS-M-ST-80C 3.2.3 (risk) index <general> score used to measure the magnitude of the risk; it is a combination of the likelihood of occurrence and the severity of consequence, where scores are used to measure likelihood and severity
ECSS-M-ST-80C 3.2.5 (risk) management process <general> consists of all the project activities related to the identification, assessment, reduction, acceptance, and feedback of risks
ECSS-M-ST-80C 3.2.7 (risk) reduction <general> implementation of measures that leads to reduction of the likelihood or severity of risk
NOTE Preventive measures aim at eliminating the cause of a problem situation, and mitigation measures aim at preventing the propagation of the cause to the consequence or reducing the severity of the consequence or the likelihood of the occurrence.
ECSS-M-ST-80C 3.2.9 (risk) scenario <general> sequence or combination of events leading from the initial cause to the unwanted consequence
NOTE The cause can be a single event or something activating a dormant problem.
ECSS-M-ST-80C 3.2.10 (risk) trend <general> evolution of risks throughout the life cycle of a project
ECSS-Q-ST-70-46C Rev. 1 3.2.10 (screw) thread <general> helical ridge of approximately triangular, square or rounded section, formed on a cylindrical core, the pitch and core diameter being standardised under various systems
ECSS-E-ST-10-12C 3.2.38 (total) non-ionising dose, (T)NID, or non-ionising energy loss (NIEL) dose <general> energy absorption per unit mass of material which results in damage to the lattice structure of solids through displacement of atoms NOTE Although the SI unit of TNID or NIEL dose is the gray (see definition 3.2.34), for spacecraft radiation effects, MeV/g(material) is more commonly used in order to avoid confusion with ionising energy deposition, e.g. MeV/g(Si) for TNID in silicon.
ECSS-S-ST-00-01C 2.3.129 [launcher] production facilities <general> launcher element manufacturing facilities and related launch complex NOTE The launcher element manufacturing facilities include the test facilities specific to the launcher elements’ manufacturing.
ECSS-E-ST-50-13C 3.2.1 1553 message <general> data-link layer exchange as defined in clause 3.7 of MIL-STD-1553B
ECSS-E-ST-10-03C 3.2.1 24-hour equivalent noise exposure level <general> equivalent sound pressure level (Leq) to which the crew members are exposed over a 24-hour period; expressed in dBA NOTE 0 dBA corresponds to 20 µPa.
ECSS-Q-ST-70-30C 3.2.1 a turn of wire <general> a wrap consisting of one complete single helical ring of wire wrapped 360 degrees around the terminal post, touching all four corners of the post. NOTE For the purpose of counting turns, the number of times the wrapped wire passes and intercepts the reference edge of the terminal post after the first intercept of uninsulated wire and terminal post, constitutes the number of turns of uninsulated wire in the connection.
ECSS-E-ST-32C Rev. 1 3.2.1 A-basis design allowable (A-value) <general> mechanical property value above which at least 99 % of the population of values is expected to fall, with a confidence level of 95 %
ECSS-E-ST-10-03C 3.2.3 abbreviated functional test (AFT) <general> See "reduced functional test (RFT)"
ECSS-E-ST-60-20C Rev. 1 aberration of light <general> Error on the position of a measured star due to the time of propagation of light, and the linear motion of the STR in an inertial coordinate system NOTE 1 The Newtonian first order expression of the rotation error for one star direction is:
V is the magnitude of the absolute linear velocity
&xnbsp; of the spacecraft w.r.t. to an inertial frame
c is the light velocity (299 792 458 m/s)
&xnbsp; is the angle between the&xnbsp;&xnbsp; vector and the star direction&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;
NOTE 2 For a satellite on an orbit around the Earth, the absolute velocity is the vector sum of the relative velocity of the spacecraft w.r.t the Earth and of the velocity of the Earth w.r.t the Sun.
NOTE 3 For an Earth orbit, the magnitude of this effect is around 25 arcsec (max). For an interplanetary spacecraft the absolute velocity is simply the absolute velocity w.r.t. the sun.
NOTE 4 The associated metrics is the MDE (see Annex B.5.11 for the mathematical definition). The detailed contributors to the relativistic error are given in Annex G&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;&xnbsp;
ECSS-E-ST-35C Rev. 1 ablated thickness <general> removed thickness of thermal protection material, due to thermal and mechanical loads, during combustion duration NOTE Mathematically called “ea”
ECSS-E-ST-31C ablation <general> chemical change and removal of surface material due to the action of external high temperature heating&xnbsp; NOTE Ablation consumes energy and provides a cooling effect in the underlying material level.
ECSS-E-ST-60-10C 3.2.1