SIST EN 2240-091:2011

Overview

SIST EN 2240-091:2011 is a European Standard developed by CEN that specifies the required characteristics for incandescent lamps, specifically lamp code 7714, designed for aerospace applications. This standard is part of the broader Aerospace series and must be applied in conjunction with EN 2756, which defines the test methods for incandescent lamps in this sector. Approved by the Aerospace and Defence Industries Association of Europe (ASD-STAN), the standard ensures that lamp code 7714 meets strict quality, performance, and safety criteria suitable for the demanding aerospace environment.

Key Topics

Required Characteristics

The standard details precise specifications for lamp code 7714, covering:

• Dimensions and Mass: Defines physical measurements in millimeters, including overall length, light center length, and weight. The lamp has a light center length (LCL) of 7 ± 0.75 mm and a standard mass optimized for aerospace usage.
• Electrical Parameters: Specifies nominal voltage at 5 V, nominal current of 0.075 A, and power consumption of 0.375 W to ensure energy efficiency and reliability in aviation systems.
• Light Output and Color: Includes luminous flux rated at 1.13 lumens with a color temperature of approximately 2080 K, suitable for cockpit and instrumentation lighting.
• Filament Form and Cap Type: The filament design follows the form C – 2R, and the lamp base uses a G 1.27 cap, standardized as per EN 2241.
• Service Life: Life expectancy varies with operating conditions - 2,000 hours static on direct current (d.c.), 1,500 hours dynamic on d.c., and 2,500 hours static on alternating current (a.c.).

Designation and Marking

• The lamp is identified by the code 7714 and marked accordingly on the lamp and packaging.
• Marking follows international coding conventions outlined in EN 2240-002, ensuring traceability and consistency across the aerospace industry.

Normative References

The standard should be used alongside related documents such as:

• EN 2240-001 (Technical specifications for incandescent lamps).
• EN 2240-002 (Main characteristics of incandescent lamps).
• EN 2241 (Lamp caps - dimensions).
• EN 2756 (Test methods for incandescent lamps).

Applications

The SIST EN 2240-091:2011 standard applies directly to incandescent lamps used in aerospace equipment and systems, including:

• Aircraft Cockpit Lighting: Providing reliable illumination with precise specifications for instrument panels and indicators critical to pilot visibility and safety.
• Cabin Interiors: Ensuring consistent lighting conditions inside aircraft cabins that meet operational and comfort requirements.
• Aerospace Electrical Systems: Integrates into aerospace electric equipment where standardized, high-performance lighting solutions are mandatory.
• Defense and Spacecraft: Suitable for use in defense aviation applications requiring rigorous compliance with quality and safety standards.

By adhering to this standard, manufacturers and aerospace engineers can guarantee lamp compatibility with a wide range of aerospace systems while maintaining uniformity and high reliability.

Related Standards

Compliance with SIST EN 2240-091:2011 involves reference to multiple complementary standards within the Aerospace series:

• EN 2756 – Provides the essential test methods for incandescent lamps to validate performance and durability under aerospace conditions.
• EN 2240-001 & EN 2240-002 – Define detailed technical specifications and primary characteristics for incandescent lamps, supporting product design and verification.
• EN 2241 – Specifies lamp cap dimensions ensuring mechanical compatibility and secure installation.

Integrating these standards supports a comprehensive quality framework that governs aerospace incandescent lamp manufacturing, testing, and usage.

By implementing the SIST EN 2240-091:2011 standard, aerospace manufacturers and users benefit from a harmonized approach to incandescent lamp specification. This standard ensures lamps meet critical aviation requirements, promoting safety, operational efficiency, and consistent product quality across the aerospace sector.