MH/T 6135-2025 in English

A Professional Interpretation of the MH/T 6135-2025 Technical Specification for Aircraft Temperature-Controlled Containers

MH/T 6135-2025, a key technical standard for China's civil aviation industry, was released on July 18, 2025, and officially implemented on August 1, 2025. Jointly drafted by Qingdao Honghu Aviation Technology Co., Ltd., the China Academy of Civil Aviation Science and Technology, and other organizations, this standard marks a further improvement in my country's technical standards system for temperature-controlled aviation transport equipment.

Background of Standard Development and Technological Evolution

With the rapid growth in demand for air transport of temperature-sensitive cargo such as biopharmaceuticals and high-end foods, the importance of technical specifications for temperature-controlled aviation containers, as critical equipment for ensuring cargo quality, has become increasingly prominent. The development of this standard draws heavily on advanced international standards such as SAE AS6163 and GB/T 18433-2023, integrating them with the actual needs of my country's air transport industry to form a technical specification system with Chinese characteristics.

The technical evolution of the standard is mainly reflected in three aspects: first, the improvement of temperature control accuracy, requiring the temperature uniformity of active temperature-controlled containers to be no more than 4°C; second, the expansion of environmental adaptability, with the operating temperature range covering -30°C to 45°C; third, the improvement of safety requirements, adding systematic requirements such as electromagnetic compatibility and electrical safety.

Comparison of Product Classification and Technical Requirements

In-depth analysis of key technical requirements

Core temperature performance indicators

The standard sets strict requirements for the temperature performance of active temperature-controlled containers:

Temperature control accuracyWhen the set temperature is 5°C, the temperature at each measuring point must be within the range of 2°C to 8°C; when the set temperature is 20°C, the temperature must be within the range of 15°C to 25°C. This requirement ensures the temperature-controlled containers' ability to maintain control within critical temperature ranges. Temperature Uniformity: Required to be no greater than 4 (+2/-2)°C. This means that temperature variations within different locations must be kept within a narrow range to avoid localized overheating or overcooling. Temperature Fluctuation: This level is divided into two levels based on the set temperature: no more than 4.5°C for temperatures ≤10°C and no more than 6°C for temperatures >10°C, reflecting differentiated control accuracy requirements for different temperature ranges. The standard's structural requirements for active temperature-controlled containers include basic requirements such as door surface quality, customs seals, and moorings. Special emphasis is placed on the durability of door hinges and handles, requiring no deformation or damage after 1,500 opening and closing cycles. Rainproof performance meets the IPX5 rating specified in GB/T 4208-2017, ensuring normal operation in adverse weather conditions. Electrical safety complies with the requirements of GB/T 42125.1-2024, and electromagnetic compatibility complies with the requirements of GB/T 18268.1, establishing a comprehensive safety assurance system.

Test Method Standardization

Temperature Performance Test

The standard specifies detailed temperature performance test methods, including:

Measurement Point Arrangement: 15 temperature sensors are used, distributed across three test planes, to ensure comprehensive and representative temperature measurements.

Valid Data Collection: Instantaneous temperature data must be collected within a positive integer period of approximately three hours, at least once per minute, to ensure data continuity and integrity.

Stable State Determination: The instantaneous temperature values at each measuring point within the chamber must not vary by more than 0.5K within two hours during multiple temperature control cycles.

Environmental Adaptability Test

The standard requires that active temperature-controlled containers operate normally under the environmental conditions specified in Table 1, including harsh operating conditions such as a rated operating low temperature of -30°C, a rated operating high temperature of 45°C, and a rated operating humidity of 45°C/93% RH, ensuring equipment reliability in various climates.

Implementation Recommendations and Operating Specifications

Design and Manufacturing Recommendations

When designing and producing aviation temperature-controlled containers, manufacturers should focus on the accuracy and reliability of the temperature control system, selecting components that meet aviation environmental requirements to ensure stable operation under harsh conditions such as vibration and temperature fluctuations.

A modular design approach is recommended to facilitate maintenance and component replacement. Lightweight design should also be considered to reduce equipment weight while maintaining structural strength, thereby improving the economic efficiency of air transportation.

Operational Specifications

When using temperature-controlled containers, users should strictly follow MH/T 1079, "Operational Specifications for Temperature-Controlled Cargo Transport Support in Public Aviation," focusing on the following:

Pre-loading equipment inspection to ensure the proper functioning of temperature sensors and control systems; temperature monitoring during operation to promptly detect and address abnormalities; and regular maintenance to maintain optimal equipment operating condition.

Pay special attention to monitoring battery charge to ensure sufficient battery life during transport to avoid temperature runaway due to insufficient battery.

Quality Control Key Points

Quality control should focus on the stability and consistency of temperature performance, and establish a comprehensive quality traceability system. Manufacturers are recommended to establish an Operational Damage Limit Notification (ODLN) to clearly define usage restrictions and maintenance requirements.

Perform regular calibration and verification to ensure the accuracy of temperature measurement and control, and establish comprehensive technical documentation to provide data support for subsequent technical improvements and quality enhancements.

Significance of Standard Implementation and Development Outlook

The implementation of MH/T 6135-2025 will strongly promote the technological advancement and industrial upgrading of my country's aviation temperature-controlled transport equipment, providing safer and more reliable transportation guarantees for temperature-sensitive goods such as biopharmaceuticals and high-end foods.

With the continuous development of technology, aviation temperature-controlled containers will develop in the direction of intelligence and networking in the future, realizing functions such as remote monitoring, intelligent early warning, and data analysis, further improving the service quality and operational efficiency of aviation cold chain logistics.

The implementation of the standard will also promote the coordinated development of related industrial chains, drive the advancement of related technologies such as sensors, control systems, and insulation materials, and form a favorable industrial development ecosystem.