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Aircraft - Environmental test for airborne fluid system components - Resistance to fire in designated fire zones
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Basic data
| Standard ID | GB/T 45976-2025 (GB/T45976-2025) |
| Description (Translated English) | Aircraft - Environmental test for airborne fluid system components - Resistance to fire in designated fire zones |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | V20/29 |
| Classification of International Standard | 49.080 |
| Word Count Estimation | 10,143 |
| Date of Issue | 2025-08-01 |
| Date of Implementation | 2026-02-01 |
| Issuing agency(ies) | State Administration for Market Regulation, Standardization Administration of China |
GB/T 45976-2025: Aircraft - Environmental test for airborne fluid system components - Resistance to fire in designated fire zones
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45976-2025
ICS 49.080
CCSV20/29
National Standard of the People's Republic of China
Environmental testing of aircraft onboard fluid system components
Flame resistance in designated fire zones
Released on August 1, 2025
Implementation on February 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is equivalent to ISO 23935.2006 “Environmental test procedures for components of aircraft onboard fluid systems – Flame resistance in specified fire zones”.
Receptivity".
The following minimal editorial changes have been made to this document.
--- To coordinate with the existing standard, the name of the standard is changed to "Flame in designated fire zones for environmental testing of aircraft onboard fluid system components
Tolerance.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed and coordinated by the National Technical Committee for Standardization of Aircraft (SAC/TC435).
This document was drafted by. Shanghai Aircraft Design and Research Institute of Commercial Aircraft Corporation of China, University of Science and Technology of China, Civil Aviation Administration of China
The Second Research Institute of the General Administration of Civil Aviation, the Jincheng Nanjing Electromechanical and Hydraulic Engineering Research Center of the Aviation Industry Corporation of China, and the Guangdong Radio and Television Metrology and Testing Group Co., Ltd.
Co., Ltd., Tianjin Fire Protection Research Institute of the Ministry of Emergency Management.
The main drafters of this document are. Xu Wenjie, Wu Hao, Li Chuang, Wang Shuofan, Chen Xuegang, Ji Jie, Pan Jun, Yu Shui, Zhao Qisen, Zhang Chuan, Chen Long,
Wang Chen, Hu Cheng, Liu Yadi, Wu Fan, and Wang Jin.
Environmental testing of aircraft onboard fluid system components
Flame resistance in designated fire zones
WARNING. Precautions should be taken to protect the health of test personnel and to avoid fire, inhalation of smoke and/or toxic combustion products.
Danger.
1 Scope
This document specifies the flame tolerance test requirements for fluid system components within designated fire zones. Such fluid system components must meet the specified
Minimum flame resistance rating requirements.
This document does not address flame resistance outside designated fire zones, flammability requirements, and conditions arising from combustion chamber flames.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
ISO 2685.1998 Aircraft-borne equipment environmental test procedure flame resistance in a specified fire zone
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
designated fire zone designated fire zone
The area of an aircraft defined by the aircraft designer in accordance with the requirements of the certifying authority, for example, the compartment containing the main engine and auxiliary power unit.
3.2
component
A unit in a fluid system that transports and/or contains liquids or gases.
3.3
fire resistant
The ability of a component (3.2) to withstand a standard flame impact for 5 min
3.4
fireproof
The ability of a component (3.2) to withstand a standard flame impact for 15 min
4 Test equipment
The test equipment should comply with ISO 2685.1998.
The test equipment should be able to withstand the test conditions and simulate the actual fluid flow working conditions as much as possible.
...
