MH/T 4055.3-2022 in English

Standard Background and Technology Evolution

With the advancement of my country's low-altitude open policy, the general aviation field has entered a period of rapid development. As the first set of industry standards in the field of low-altitude flight services, the MH/T 4055 series of standards establishes a unified methodology for system testing in its third part. Before the formulation of this standard, the testing processes of various manufacturers had problems such as poor compatibility of ADS-B data reception and inconsistent flight plan approval processes.

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Comparison of core test frameworks

Test category	Key indicators	Test method	Pass standard
Functionality	14 subsystem functions	Equivalence class division method	Meet MH/T 4055.2 requirements
Reliability	MTBF≥5000 hours	Redundancy switching test	Master-slave switching time≤30 seconds
Information security	Technology Protection Scheme 2.0 Level 3	Penetration test	No high-risk vulnerabilities

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Detailed explanation of key test methods

6.1.2 Flight plan processing

Use the boundary value analysis method to verify the required fields:

• Aircraft registration number: Test the abnormal situation containing special characters (such as B-123*)
• Planned take-off time: Verify the cross-date boundary processing (23:59→00:01)

Typical case: During the test, a general aviation company found that the flight plan cancel function did not take into account the coordination status of the controller. After the implementation of the standard, a state machine check was added.

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6.1.3 Surveillance data processing

Focus on testing the ADS-B track fusion algorithm:

• When there is a conflict in multi-source data, 1090ES signal is given priority
• Track update delay should be ≤2 seconds (under 4G communication environment)

The measured data from a provincial flight service station show that an alarm should be triggered when the positioning deviation between Beidou and ADS-B exceeds 300 meters.

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Implementation suggestions

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Technology evolution direction

This standard may be supplemented in the future:

• 5G-AeroMACS communication test requirements
• Special test scenarios for UAV beyond visual line of sight (BVLOS) operations
• AI-based trajectory prediction algorithm verification specifications