EN 2591-303:1997

Overview

EN 2591-303:1997 - Aerospace series: Elements of electrical and optical connection - Test methods - Part 303: Cold/low pressure and damp heat (CEN) defines a standardized test method to verify the long-term stability of electrical and optical connection elements when exposed to environments that combine cold, low pressure and damp heat, particularly where ionisation phenomena may affect performance. This part is intended to be used in conjunction with EN 2591 (the EN 2591 series) as part of connector qualification and environmental validation for aerospace applications.

Key Topics

• Scope and purpose: Establishes a reproducible test method to assess connector behaviour under combined cold, low-pressure and damp-heat conditions that can interact with ionisation effects.
• Environmental stress conditions: Defines the types of environmental exposures to be applied (cold, reduced atmospheric pressure, and humid heat) and the method sequence for reproducing service-like conditions. (Specific parameter values are given in the standard itself.)
• Performance assessment: Focuses on long-term stability criteria - typically verified through pre- and post-test evaluations of electrical and optical performance, mechanical integrity and signs of degradation caused or accelerated by ionisation-related processes.
• Test procedure requirements: Covers conditioning, exposure cycles, monitoring and record-keeping needed to ensure repeatable, comparable test results.
• Reporting: Specifies the information and results that must be included in test reports to support qualification, procurement or compliance decisions.

Applications

• Aerospace manufacturers and suppliers use EN 2591-303 to qualify connectors and harness components for aircraft, spacecraft and related systems where pressure, temperature and moisture variation - coupled with ionising radiation - can affect reliability.
• Test laboratories implement the standard as part of test suites for connector certification and environmental testing.
• Design and reliability engineers apply the method during design validation, failure analysis and life-cycle assessments to ensure connector longevity and safety.
• Procurement and quality teams reference the standard in supplier specifications and acceptance testing to ensure conformance with aerospace environmental requirements.

Related Standards

• The standard shall be used in conjunction with EN 2591 (the overarching series for elements of electrical and optical connection).
• Other parts of the EN 2591 series address alternative environmental and mechanical test methods; refer to the EN 2591 family for complementary procedures covering vibration, thermal cycling, salt spray and other qualification tests.

Keywords: EN 2591-303:1997, aerospace connector test methods, cold low pressure damp heat, ionisation phenomena, electrical and optical connection testing, CEN standard, connector qualification.