GB9745-2025
Aircraft tyres
航空轮胎
GB 9745-2025 is an upcoming mandatory Chinese national standard for Aircraft tyres. It appears in the Electronics compliance cluster with a product safety focus and has an implementation date of Jan 1, 2027.
Applicability depends on product scope, certification route, competent authority notices and transition rules. Requst for the translation or verify source before using this record in a compliance decision.
Compliance overview
Scope and applicability
This standard applies to civil new aircraft tyres, encompassing both bias and radial tyre types. It covers the requirements, testing methods, marking, storage, and recycling of these tyres. It is not applicable to retreaded or used aircraft tyres. The standard is particularly relevant for manufacturers producing aviation tyres for the Chinese market, including specific parameter allowances for helicopter applications.
Technical requirements
The standard outlines stringent criteria across several core areas. Firstly, it defines main parameters such as specifications, ply ratings, and rim sizes, with specific multiplier allowances for rated load and inflation pressure when applied to helicopters. Secondly, it establishes rigorous dynamic performance criteria, requiring tyres to withstand multiple cycles of takeoff, landing, and taxiing tests under varying load conditions, including overload scenarios. Tyres must also demonstrate sufficient gas tightness and pressure retention capabilities post-testing. Furthermore, the standard mandates super-pressure performance and static balance requirements, utilizing specific mathematical formulas to determine maximum allowable static unbalance based on tyre diameter. It also sets clear limits on surface quality and strictly prohibits internal defects like bubbles or cord breakage. A notable addition in this revision is the requirement for environmental adaptability and bead high-temperature resistance. Tyre materials must not degrade in physical properties after prolonged exposure to extreme high (71°C) and low (-40°C) temperatures, as well as elevated bead temperatures (150°C).
Testing methods
Testing procedures are primarily conducted in accordance with the referenced standard GB/T 9747. Key evaluations include dynamic performance tests simulating takeoff and landing cycles, super-pressure tests to verify structural integrity, and gas permeability tests for tubeless tyres. Dimensional measurements for radial tyres are specifically conducted after 50 dynamic takeoff test cycles. Additionally, internal defects are assessed using laser digital non-destructive testing methods as specified in GB/T 22039, while surface quality is verified through calibrated measuring tools and visual inspection.
FAQs
What products are regulated under GB 9745-2025?
GB 9745-2025 applies to civil new aircraft tyres, which refers to tyres that have neither been used nor retreaded. It covers requirements for both bias and radial tyres used in commercial aviation.
Are there any updates from the previous version of GB 9745?
The 2025 version is a mandatory standard replacing the previous GB/T 9745-2009. Key updates include the addition of environmental adaptability and bead high-temperature resistance requirements, new specifications for radial tyre dimensions, and revised dynamic performance and static balance criteria.
Does GB 9745-2025 include specific requirements for helicopter tyres?
Yes, for helicopter applications, the standard allows the rated load to be increased to 1.50 times and the rated inflation pressure to 1.80 times, without requiring additional qualification tests. The outer dimensions may also be increased by 4%.
The summary above provides a high-level overview of GB 9745-2025. To ensure complete compliance for your aviation products entering the Chinese market, a precise and professional translation of the full technical specifications is essential. Purchase our high-quality English translation of GB 9745-2025 today to access all detailed parameters, tables, and testing procedures.
Applicability hints
- Type
- Product
- CCS
- G 41
- ICS
- 83.160.20
- Competent department
- Ministry of Industry and Information Technology
- Technical committee
- National Technical Committee on Tyres and Rims of Standardization Administration of China
Relationships
Replaces:GB 9745-2009 (Current)