ECSS-Q-20-09B – Nonconformance control system (8 March 2002)

This standard has been cancelled and replaced by ECSS-Q-ST-10-09C.


This Standard defines the control system for nonconformances related to any product, including EEE components nonconformances, software problems and operational nonconformances and anomalies.
This Standard applies to all deliverable products and supplies, at all levels,which fail to conform to specification requirements and design baselines.

This Standard is applicable throughout

  • procurement, production, qualification, integration and test phases,
  • acceptance, delivery and transportation phases,
  • launch preparation phase and flight or launch readiness,
  • operational validation or qualification phase,
  • operational phase, and
  • refurbishment phase.

This Standard defines also requirements for the interfaces with company internal nonconformance reporting and processing.

Engineering changes are not subject of this Standard.



This standard cancels and replaces by ECSS-Q-ST-20-09A.