MH/T 4007-2023 in English
VALIDThe contents,formats and data conventions of civil aviation air traffic service messages
- Issued on:2023-11-22
- Implemented on:2023-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
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本文件规定了民用航空标准固定格式空中交通服务电报类型、内容、编排结构以及数据规约。
本文件适用于民用航空空中交通服务电报的使用。
Introduction
Analysis of the core content of the standard
MH/T 4007-2023, as the third revised version of the civil aviation industry standard, comprehensively regulates the format requirements and data specifications of air traffic service (ATS) telegrams. Compared with the 2012 version, the new version of the standard mainly presents the following technical evolution:
| Technical Dimensions | Features of the 2012 version | Improvements of the 2023 version |
|---|---|---|
| Structural system | Focus on flight dynamics messages | Expanded to a complete ATS message system |
| Data Protocol | Definition of basic data elements | New chapter on general data protocol (Chapter 5) |
| International integration | Reference to ICAO Annex 10 | Synchronize with the latest requirements of ICAO Doc 4444 |
Key Technical Elements
1. Message Classification System
The standard divides ATS messages into three categories and 14 specific types, and clearly identifies them through data element A of group 3:
- Emergency message: ALR (alarm warning), RCF (radio failure message)
- Dynamic message: 7 flight status messages such as FPL (pilot plan message)
- Coordination message: 4 control coordination messages such as CDN (control coordination message)
2. Grouping data structure
A two-level data structure specification is adopted:
- b class=instrument>Group level: 22 standard groups (such as group 7-aircraft identification)
- Element level: Each group contains 1-3 data elements (such as SSR mode/code)
The data format strictly defines two representation methods:
Format 1: fixed length (such as the 3-letter telegraph code of group 3) Format 2: variable length (such as other information of group 18)
Implementation recommendations
System transformation precautions
For the main technical changes in the standard, it is recommended to focus on:
- Character set compatibility: Support ITA-2 and IA-5 dual character set transmission (4.2.1)
- Message length: Control reports shall not exceed 1800 symbols (4.5.2)
- Wake turbulence classification: Update the aircraft classification code according to the maximum take-off weight (5.8.1)
Typical application scenarios
Take Flight Plan Report (FPL) as an example:
- Group 7 must contain aircraft identification marks (5.7)
- Group 10 must indicate RNAV/RNP capabilities (Appendix D)
- Group 15 cruising altitude level indication should comply with ICAO Annex 2 requirements (5.13)
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