ISO 7295:1988/Amd 1:2014

Overview

ISO 7295:1988/Amd 1:2014 is an international standard specifying interchangeability dimensions for aircraft tyre valves. This amendment updates key dimensional tolerances to ensure components fit and function reliably across different manufacturers and aircraft models. Produced by ISO Technical Committee 31, Subcommittee 9-experts in tyres, rims, and valves-the standard supports safety and consistency in aviation maintenance and production environments.

Key Topics

• Interchangeability Dimensions: Defines critical measurements such as valve stem sizes and tolerances that guarantee compatibility between different tyre valve parts.
• Core Pin Head Position: Amendment 1 specifically updates tolerances for the valve core pin head relative to the valve mouth. These tolerances ensure proper sealing and valve operation.
• Torque Specifications: The amendment details required torque ranges when inserting valve cores-0.23 to 0.56 N·m for elastomeric barrel gasket cores, and 0.40 to 0.50 N·m for metallic sealing gasket cores-to maintain secure installation and prevent leaks.
• Measurement Units and Limits: All tolerances and dimensions are expressed in millimetres, ensuring universal applicability and precision.

Applications

• Aircraft Tyre Manufacturing: Ensures tyre valves meet consistent dimensional standards, facilitating interchangeability between different suppliers and tires.
• Aerospace Maintenance and Repair: Provides maintenance crews with exact specifications to inspect, replace, or repair tyre valves reliably, enhancing safety and compliance.
• Quality Control and Testing: Supplies dimensional and torque benchmarks that manufacturers and service providers use to validate product conformity.
• Supply Chain Standardization: Supports global aviation parts suppliers by harmonizing valve component sizes, simplifying inventory management and reducing operational risk.

Related Standards

• ISO 4000 series - Covers tyre and rim dimensions for aircraft and other vehicles, complementing valve dimensional standards for complete wheel assembly interoperability.
• ISO 11911 series - Addresses valve fittings and assemblies for pneumatic tyres, providing broader context and additional guidance on valve performance criteria.
• SAE Aerospace Standards - Often referenced alongside ISO standards for aviation parts to ensure comprehensive compliance with both international and industry-specific regulations.

By adhering to ISO 7295:1988/Amd 1:2014, aviation manufacturers and service providers achieve higher reliability, safety, and operational efficiency in tyre valve usage. The clear dimensional tolerances and torque guidance contained in the amendment are crucial for maintaining the integrity of aircraft tyres under demanding conditions.

Keywords: ISO 7295, aircraft tyre valve, valve interchangeability, tyre valve dimensions, aerospace maintenance, valve torque specification, tyre valve standard, aviation safety standards, tyre valve compatibility.