GB 9745-2025 Aircraft tyres English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS H
National Standard of the People's Republic of China
GB 9745-2025
Aircraft tyres
航空轮胎
Issue date: 2025-12-31 Implementation date: 2027-01-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Requirements
5 Test Methods
6 Marking, Storage, and Use
7 Recycling and Comprehensive Utilization
Aircraft Tires
1 Scope
This document specifies the requirements, test methods, marking, storage and use, recycling and comprehensive utilization for aircraft tires.
This document is applicable to new civil aircraft tires.
NOTE: New aircraft tires refer to tires that are neither used nor retreaded.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 6326 Tire Terminology
GB/T 9746 Series of Aircraft Tires
GB/T 9747 Test Methods for Aircraft Tires
GB/T 13652 Surface Quality of Aircraft Tires
GB/T 22037 Test Method for Bead Fit Pressure of Aircraft Tube Tires – Electrical Measurement Method
GB/T 22039 Non-Destructive Testing Method for Aircraft Tires Using Laser Digital Technology
HG/T 2195 Use and Maintenance of Aircraft Tires
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 6326 apply.
4 Requirements
4.1 Main Tire Parameters
For tires listed within the parameter ranges specified in GB/T 9746, the tire size, ply rating, rated values, and rim shall comply with the provisions of GB/T 9746. For tires not listed within the parameter ranges specified in GB/T 9746, the tire size, ply rating, rated values, and rim shall comply with the manufacturer's declared values. When tires are used on helicopters, the rated load may be increased to 1.50 times and the rated inflation pressure may also be increased to 1.80 times accordingly, without requiring any additional qualification tests.
4.2 Overall Dimensions
4.2.1 Bias Tires
The overall dimensions of bias tires shall comply with the provisions of GB/T 9746 or the manufacturer's declared values. When tires are used on helicopters, the overall dimensions of the tires may be increased by 4%.
4.2.2 Radial Tires
After the tire completes 50 take-off runs in the dynamic performance test, the overall dimensions shall comply with the provisions of GB/T 9746 or the manufacturer's declared values. When tires are used on helicopters, the overall dimensions of the tires may be increased by 4%.
4.3 Static Loaded Radius
The static loaded radius of the tire shall comply with the provisions of GB/T 9746.
4.4 Dynamic Performance
4.4.1 Low-Speed Tires
The dynamic performance of low-speed tires shall comply with one of the following requirements:
a)Low-speed tires shall pass 200 landing tests, including 100 low-speed landing tests and 100 high-speed landing tests;
b) Low-speed tires shall pass the dynamic performance tests specified for high-speed tires (4.4.2).
b)4.4.2 High-Speed Tires
c)High-speed tires shall pass 61 take-off and taxi dynamic performance tests, including 50 take-off runs at rated load, 8 taxi runs at rated load, 2 taxi runs at 1.2 times the rated load, and 1 overload take-off run at 1.5 times the rated load. During dynamic performance testing, if the overload take-off test is arranged at the very end of the complete dynamic performance test sequence, the tire tread does not need to remain intact upon completion of the test. If the overload take-off test is not arranged at the very end, the tire tread shall not show any visible damage beyond normal tread wear upon completion of the test.
d)4.4.3 Air Tightness Check
e)Within 24 hours after completing the dynamic performance tests, the loss of inflation pressure in the tire shall be less than 10% of the initial inflation pressure at the start of the tests.
f)4.5 Overpressure Performance
g)When inflated to no less than 4 times the rated inflation pressure, the tire shall withstand this pressure for at least 3 seconds without bursting, blistering, ply separation, wire breakage, or cord breakage.
h)4.6 Air Tightness of Tubeless Tires
i)A tubeless tire shall be inflated to the rated inflation pressure and allowed to stand at ambient temperature for at least 12 hours. The pressure shall then be adjusted back to the rated inflation pressure. After standing at ambient temperature for an additional at least 24 hours, the decrease in inflation pressure shall not exceed 5% of the rated inflation pressure. When measuring inflation pressure, the ambient temperature deviation shall not exceed ±3°C.
j)4.7 Bead Fit Pressure of Tube Tires
k)The bead fit pressure values for tube tires with different rated inflation pressures shall comply with the provisions in Table 1.
l)4.8 Static Balance Imbalance
m)4.8.1 Auxiliary Tires (Non-main Wheel or Tail Wheel Tires)
n)The maximum static balance imbalance (M) for auxiliary tires shall not exceed the value calculated by formula (1):
o)4.8.2 Main Tires and Tires with Overall Diameter ≥ 1168 mm
p)The maximum static balance imbalance (M) for all main tires and all tires with an overall diameter greater than or equal to 1168 mm shall not exceed the value calculated by formula (2):
q)4.9 Surface Quality
r)The surface quality of the tire shall comply with the provisions of GB/T 13652.
s)4.10 Internal Defects
t)The tire shall be free from internal defects such as blisters, ply separation, wire breakage, and cord breakage.
GB 9745-2025 Aircraft tyres English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS H
National Standard of the People's Republic of China
GB 9745-2025
Aircraft tyres
航空轮胎
Issue date: 2025-12-31 Implementation date: 2027-01-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative References
3 Terms and Definitions
4 Requirements
5 Test Methods
6 Marking, Storage, and Use
7 Recycling and Comprehensive Utilization
Aircraft Tires
1 Scope
This document specifies the requirements, test methods, marking, storage and use, recycling and comprehensive utilization for aircraft tires.
This document is applicable to new civil aircraft tires.
NOTE: New aircraft tires refer to tires that are neither used nor retreaded.
2 Normative References
The following documents contain provisions which, through normative reference in this text, constitute essential provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 6326 Tire Terminology
GB/T 9746 Series of Aircraft Tires
GB/T 9747 Test Methods for Aircraft Tires
GB/T 13652 Surface Quality of Aircraft Tires
GB/T 22037 Test Method for Bead Fit Pressure of Aircraft Tube Tires – Electrical Measurement Method
GB/T 22039 Non-Destructive Testing Method for Aircraft Tires Using Laser Digital Technology
HG/T 2195 Use and Maintenance of Aircraft Tires
3 Terms and Definitions
For the purposes of this document, the terms and definitions given in GB/T 6326 apply.
4 Requirements
4.1 Main Tire Parameters
For tires listed within the parameter ranges specified in GB/T 9746, the tire size, ply rating, rated values, and rim shall comply with the provisions of GB/T 9746. For tires not listed within the parameter ranges specified in GB/T 9746, the tire size, ply rating, rated values, and rim shall comply with the manufacturer's declared values. When tires are used on helicopters, the rated load may be increased to 1.50 times and the rated inflation pressure may also be increased to 1.80 times accordingly, without requiring any additional qualification tests.
4.2 Overall Dimensions
4.2.1 Bias Tires
The overall dimensions of bias tires shall comply with the provisions of GB/T 9746 or the manufacturer's declared values. When tires are used on helicopters, the overall dimensions of the tires may be increased by 4%.
4.2.2 Radial Tires
After the tire completes 50 take-off runs in the dynamic performance test, the overall dimensions shall comply with the provisions of GB/T 9746 or the manufacturer's declared values. When tires are used on helicopters, the overall dimensions of the tires may be increased by 4%.
4.3 Static Loaded Radius
The static loaded radius of the tire shall comply with the provisions of GB/T 9746.
4.4 Dynamic Performance
4.4.1 Low-Speed Tires
The dynamic performance of low-speed tires shall comply with one of the following requirements:
a)Low-speed tires shall pass 200 landing tests, including 100 low-speed landing tests and 100 high-speed landing tests;
b) Low-speed tires shall pass the dynamic performance tests specified for high-speed tires (4.4.2).
b)4.4.2 High-Speed Tires
c)High-speed tires shall pass 61 take-off and taxi dynamic performance tests, including 50 take-off runs at rated load, 8 taxi runs at rated load, 2 taxi runs at 1.2 times the rated load, and 1 overload take-off run at 1.5 times the rated load. During dynamic performance testing, if the overload take-off test is arranged at the very end of the complete dynamic performance test sequence, the tire tread does not need to remain intact upon completion of the test. If the overload take-off test is not arranged at the very end, the tire tread shall not show any visible damage beyond normal tread wear upon completion of the test.
d)4.4.3 Air Tightness Check
e)Within 24 hours after completing the dynamic performance tests, the loss of inflation pressure in the tire shall be less than 10% of the initial inflation pressure at the start of the tests.
f)4.5 Overpressure Performance
g)When inflated to no less than 4 times the rated inflation pressure, the tire shall withstand this pressure for at least 3 seconds without bursting, blistering, ply separation, wire breakage, or cord breakage.
h)4.6 Air Tightness of Tubeless Tires
i)A tubeless tire shall be inflated to the rated inflation pressure and allowed to stand at ambient temperature for at least 12 hours. The pressure shall then be adjusted back to the rated inflation pressure. After standing at ambient temperature for an additional at least 24 hours, the decrease in inflation pressure shall not exceed 5% of the rated inflation pressure. When measuring inflation pressure, the ambient temperature deviation shall not exceed ±3°C.
j)4.7 Bead Fit Pressure of Tube Tires
k)The bead fit pressure values for tube tires with different rated inflation pressures shall comply with the provisions in Table 1.
l)4.8 Static Balance Imbalance
m)4.8.1 Auxiliary Tires (Non-main Wheel or Tail Wheel Tires)
n)The maximum static balance imbalance (M) for auxiliary tires shall not exceed the value calculated by formula (1):
o)4.8.2 Main Tires and Tires with Overall Diameter ≥ 1168 mm
p)The maximum static balance imbalance (M) for all main tires and all tires with an overall diameter greater than or equal to 1168 mm shall not exceed the value calculated by formula (2):
q)4.9 Surface Quality
r)The surface quality of the tire shall comply with the provisions of GB/T 13652.
s)4.10 Internal Defects
t)The tire shall be free from internal defects such as blisters, ply separation, wire breakage, and cord breakage.
