MH/T 9010.4-2018Ground-air high-speed data link technical specifications based on LET technology. Part 4: Installation and acceptance requirements (English PDF)

5.1 Basis of certification

The installation of airborne ATG equipment shall be in accordance with the regulations of the civil aviation authority to determine the certification basis for the project. Determine the basis for certification should consider its traceability requirements.

5.2 Equipment standards

The airborne ATG equipment installed on transport aircraft should meet the requirements of MH/T 9010.1, MH/T 9010.2 and MH/T 9010.3.

5.3 Structure

Should meet the requirements of the structure and load of the installed aircraft.

5.4 Design and construction

5.4.1 General requirements

The design and installation of airborne ATG equipment should not adversely affect the operation of the aircraft.

5.4.2 Accessibility

The airborne ATG equipment should be accessible for inspection and replacement required for continued airworthiness.

5.4.3 Fire protection

The airborne ATG equipment and its fixtures, EWIS components, etc. should meet the requirements of the installed aircraft for fire and smoke.

5.4.4 Electrical bonding and anti-static protection

The installation of airborne ATG equipment should meet the requirements of the installed aircraft for electrical bonding and anti-static protection to prevent personal injury and other installation problems.

The electrical and electronic system is damaged.

5.5 Equipment installation

5.5.1 Function and installation

After the airborne ATG equipment is installed, it shall comply with the regulations of MH/T 9010.1, MH/T 9010.2 and MH/T 9010.3.

5.5.2 Electricity

5.5.2.1 It shall meet the requirements for safe electricity use of the installed aircraft, including.

a) Meet the electrical load capacity of the aircraft;

b) The electrical installation of the system should not adversely affect other electrical equipment;

c) Use reasonable circuit protection devices to ensure that other equipment and aircraft will not be damaged when the system circuit fails.

5.5.2.2 When installing the airborne ATG equipment, electricity should not be taken from the aircraft's key bus bar, and it should be able to unload the electrical load in an emergency.

5.6 Security

5.6.1 System Security Assessment

According to the installation location of the airborne ATG equipment, determine its expected operating conditions, and ensure that the schedule can be completed under the expected operating conditions Function. The failure mode analysis of the system should be carried out to evaluate its impact on aircraft safety.

5.6.2 Interference effects

Airborne ATG equipment should not cause harmful conduction or radiation interference, nor should it be affected by conduction or radiation from other equipment or systems on the aircraft.

5.7 EWIS

Should comply with the relevant regulations of the civil aviation authority.

5.8 Line construction

The requirements of the aircraft manufacturer's standard wiring construction manual shall be followed.

5.9 Structural installation

The requirements of the aircraft manufacturer's structural repair manual shall be followed.

6.1 Installation compliance check

After the line installation is completed (before the installation of the LRU parts), perform the installation compliance check, check the wires, installation brackets, equipment, and Ethernet for the installation status of cables, etc., the inspection items are shown in Table 1.In the actual modification process, you can consider whether to add other inspection items according to the actual situation.

6.2 Functional test of ground installation

After the installation conformity inspection is passed, the ground installation functional test shall be carried out, and the test results shall conform to MH/T 9010.1, MH/T 9010.2 and MH/T 9010.3.

In the actual modification process, you can consider whether to add other inspection items according to the actual situation.

6.3 Electromagnetic compatibility test of ground installation

After passing the ground installation functional test, conduct ground installation electromagnetic compatibility test to verify whether the airborne ATG equipment meets the airworthiness standard Check whether the relevant requirements of the aircraft affect the normal operation of aircraft-related systems, and whether the aircraft-related systems affect the normal operation of airborne ATG equipment.

The check items are shown in Table 2.In the actual modification process, you can consider whether to add other check items according to the actual situation.

Table 2 Inspection items of electromagnetic compatibility test for ground installation

Check content of serial number check item

1 The influence of the airborne ATG system on aircraft related systems Check aircraft-related systems (such as communications, navigation Navigation, flight control, etc.) function is normal

2 The impact of aircraft-related systems on the airborne ATG system Check whether the aircraft-related systems affect the normal operation of the airborne ATG system

6.4 Flight test test (as required)

If necessary, after the ground-installed electromagnetic compatibility test is passed, a flight test is performed to verify whether the airborne ATG equipment meets the airworthiness standard Standard requirements, whether it meets the expected functional requirements, whether it affects the normal operation of aircraft-related systems, and whether aircraft-related systems affect the airborne ATG system works normally. The check items are shown in Table 3.During the actual modification process, you can consider whether to add other check items according to the actual situation.

7.1 Operation and maintenance

If the installation of airborne ATG equipment requires additional usage restrictions, supplementary and revised information for the aircraft flight manual should be compiled.

7.2 Continued airworthiness

7.2.1 Restrictions on use

If the airborne ATG system needs to be used more restricted, supplementary revision information of the manual should be prepared.

7.2.2 Maintenance and inspection intervals

The maintenance and inspection intervals of equipment and systems shall be determined based on the results of equipment and system safety assessment.

7.2.3 Maintaining data

Maintenance manuals for the airborne ATG system should be provided, such as load balance reports, electrical load analysis reports, supplementary aircraft maintenance manuals, supplementary Circuit diagram manual, supplementary parts catalog, etc.

7.2.4 Difficulties solved

The equipment supplier shall provide continuous solutions to difficulties in use.

7.3 Fault isolation

7.3.1 Fault isolation procedure

A reasonable fault isolation procedure should be developed to quickly locate system faults.

7.3.2 Repair procedure of defective parts

A clear and reasonable repair procedure for faulty parts shall be established to help users obtain parts repair services as soon as possible.