EN 3289:1994

Overview

EN 3289:1994 is a European standard under the Aerospace series developed by CEN, focusing on double row self-aligning ball bearings made from corrosion resisting steel. These bearings fall under diameter series 2, specifically designed to support airframe rolling applications in aircraft structures. The standard defines essential dimensions and load capacities for these bearings.

This standard targets bearings intended to operate under conditions of slow rotations, oscillations, and swiveling motions while under load. Their use spans the interfaces between fixed and moving parts within aircraft structures and their control mechanisms. Operating temperature ranges from -54°C to 150°C ensure reliability across various aeronautical environments.

The standard is essential for aerospace manufacturers and engineers involved in designing and maintaining aircraft where corrosion resistance, precise fits, and load endurance are critical.

Key Topics

• Double Row Self-Aligning Ball Bearings
  Bearings that can accommodate misalignment and shaft deflections without affecting performance, featuring two rows of balls for enhanced load distribution.

• Corrosion Resisting Steel
  Material specifications ensuring increased durability and resistance to harsh environmental conditions typical in aerospace applications.

• Diameter Series 2
  A specific range of bearing sizes standardized for airframe rolling use, facilitating interchangeability and design consistency.

• Dimensions and Loads
  Precise dimensional criteria and load ratings to guarantee operational safety, mechanical integrity, and compatibility within aerospace mechanisms.

• Operational Conditions
  Designed for slow rotational speeds, oscillating and swiveling motions, critical for control surface bearings and other pivoting mechanisms in aircraft.

• Temperature Range
  Bearings conforming to EN 3289 perform effectively between -54°C and 150°C, covering extreme aerospace thermal environments from high altitudes and ground operations.

Applications

• Aircraft Airframe Bearings
  Used predominantly in connecting points where moving parts such as flaps, ailerons, and landing gear components pivot or roll under load.

• Control Mechanism Joints
  Essential in bearing the loads in control linkages and rotary joints that require smooth motion and long service life.

• Oscillatory and Swiveling Bearings
  Suitable for parts requiring frequent changes in position or direction, without the need for high-speed rotation capabilities.

• Corrosion-Prone Environments
  Ideal for aerospace environments where exposure to moisture, hydraulic fluids, and atmospheric changes can cause deterioration of conventional bearings.

Related Standards

• EN 3288: Bearings, airframe rolling - Single row ball bearings
  Complements EN 3289 by defining standards for single row airframe bearings in similar corrosion-resistant materials.

• ISO 492: Rolling Bearings - Radial Bearings - Boundary Dimensions and Series
  Provides general dimensional standards that relate to diameter series classifications used in EN 3289.

• EN 9100: Quality Management Systems - Aerospace Requirements
  Ensures manufacturing and quality assurance processes for aerospace components like bearings meet industry benchmarks.

• ASTM A240: Standard for Stainless Steel Types
  Defines material grades related to corrosion-resistant steel used in aerospace bearing production.

This standard is a critical reference for aerospace engineers, designers, and quality assurance specialists looking to ensure precise bearing performance, durability, and safety in airframe rolling applications. Adhering to EN 3289:1994 guarantees consistent product quality aligned with international aerospace requirements.