SIST EN 2240-029:2010

Overview

SIST EN 2240-029:2010 is a European standard developed by CEN that specifies the product requirements and characteristics for incandescent lamp code 338 used in aerospace applications. This standard is part of the Aerospace Series for incandescent lamps and works in conjunction with EN 2756, which covers the test methods for these lamps. Published in March 2010, EN 2240-029 ensures uniformity, safety, and performance reliability for aerospace incandescent lamps across member countries.

This standard defines the technical specifications, dimensions, electrical data, and marking requirements tailored specifically for lamp code 338, which is critical for aerospace electrical equipment and systems.

Key Topics

• Scope and Application
  SIST EN 2240-029:2010 applies exclusively to incandescent lamp code 338 used in aerospace environments. It covers size, electrical ratings, luminous output, and filament configuration.

• Dimensions and Physical Characteristics
  The lamp dimensions are defined precisely in millimeters with particular focus on light center length (LCL), mass, and bulb type. For example, the standard specifies an LCL of 9.5 ± 1 mm and mass of approximately 0.65 kg per 1,000 lamps.

• Electrical and Optical Specifications

  • Nominal voltage: 2.7 V
  • Nominal current: 0.06 A
  • Nominal power: 0.162 W
  • Nominal luminous flux: 0.5 lm
  • Colour temperature: 2100 K
  • Lamp life:
    • Static DC operation: 750 hours
    • Dynamic DC operation: 500 hours
    • Static AC operation: 1000 hours

• Filament and Cap Details
  The filament form follows EN 2240-002 specifications, typically a C-2R or C-6 type filament. The lamp cap SX6s is specified in EN 2241, ensuring compatibility and interchangeability within aerospace lighting systems.

• Marking and Designation
  Lamps and their packaging must be marked with the international code number as outlined in EN 2240-002. This ensures clear identification and traceability according to aerospace industry standards.

Applications

SIST EN 2240-029:2010 lamps are essential components in a range of aerospace electrical systems, including:

• Cockpit instrument panels requiring reliable and consistent lighting
• Aircraft interior lighting where low power incandescent lamps are critical
• Indicator lamps and signal lights used in aerospace ground equipment and onboard systems
• Backup and auxiliary lighting in aerospace vehicles, particularly where incandescent lamps remain preferable over LEDs due to specific electromagnetic compatibility or dimming requirements

This standard ensures that lamps meet stringent aerospace safety, durability, and performance needs under various operational conditions including vibration, temperature fluctuations, and electrical load variations.

Related Standards

SIST EN 2240-029:2010 should be used in direct conjunction with the following standards to ensure comprehensive compliance and quality control:

• EN 2756 – Aerospace series incandescent lamp test methods detailing durability and performance testing procedures.
• EN 2240-001 – Technical specification covering overall incandescent lamp requirements across the aerospace series.
• EN 2240-002 – Defines the main characteristics and coding system for incandescent lamps including code 338.
• EN 2241 – Provides detailed specifications for lamp caps including the SX6s cap used with code 338 lamps.

These interconnected standards collectively support aerospace manufacturers and suppliers in producing lamps that meet international market requirements while promoting interchangeability and safety.

By aligning with SIST EN 2240-029:2010, aerospace industry stakeholders can ensure the use of high-quality incandescent lamps that meet rigorous European standards, thereby enhancing safety, reliability, and compatibility in critical aerospace applications.