SIST EN 3287:2001

Overview

SIST EN 3287:2001, published by CEN, is a key standard within the aerospace series, focusing on airframe rolling bearings. Specifically, it defines the requirements for double row self-aligning ball bearings in steel, classified under diameter series 2. These precision components are engineered to support slow rotational movements, oscillations, and swivelling motions under load conditions, serving as critical interfaces between fixed and moving parts of aircraft structures and their control mechanisms. The standard specifies operational suitability for temperatures ranging from -54°C to +150°C.

Key Topics

• Bearing Characteristics: SIST EN 3287:2001 outlines the attributes of double row self-aligning ball bearings made from steel, suitable for aerospace environments.
• Dimensions and Loads: The standard specifies key dimensions and load ratings for diameter series 2, ensuring compatibility and performance within typical aircraft assemblies.
• Operational Limits: Bearings defined in this standard are intended for locations where movements are slow and loads may be variable, such as control system hinges and pivot points.
• Material Specification: Only steel is specified, providing consistency in strength, durability, and thermal performance.
• Temperature Range: Bearings must reliably operate from -54°C up to +150°C, covering most aerospace deployment scenarios.
• Interchangeability: Standardization of design ensures interchangeability across the aerospace industry, promoting quality and reducing lifecycle costs.

Applications

Airframe rolling bearings described in SIST EN 3287:2001 are widely used in the aerospace sector for both civil and military aircraft. Their common applications include:

• Joints between fixed and moving structural elements, such as flaps, ailerons, elevators, and landing gear assemblies.
• Control mechanism pivots, where slow rotational or oscillatory movement is required under varying loads.
• Swivelling parts, allowing for smooth, aligned movement, reducing wear and maintenance.
• Passive or semi-active joints, where minimizing play and maximizing service life under fluctuating loads are critical.
• Maintenance and Replacement: The standardization enables seamless maintenance, replacement, and inventory control within the aircraft industry.

These bearings significantly enhance reliability, safety, and efficiency in aerospace engineering by providing consistent performance in demanding environments.

Related Standards

To ensure full compliance and integration, users of SIST EN 3287:2001 may also reference related European and international standards, such as:

• EN 3286 - Bearings, airframe rolling - General requirements
• EN 3290 - Aerospace series - Ball bearings - Technical specifications
• EN ISO 281 - Rolling bearings - Dynamic load ratings and rating life
• EN 9100 - Quality management systems in aerospace sector

Additionally, the standard fits under ICS 49.035: Components for aerospace construction, aligning with numerous other standards for aerospace components and assemblies.

By adhering to SIST EN 3287:2001, aerospace manufacturers, maintenance engineers, and procurement specialists can ensure optimal compatibility, performance, and safety for critical aircraft systems, reinforcing high standards across the aviation industry.