MH/T 4041-2014 in English
VALIDThe technical specification of civil aviation AFTN/SITA communication system
- Issued on:2014-02-08
- Implemented on:2014-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
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| Standard No: | MH/T 4041-2014 |
| Document status: | VALID |
| Title in English: | The technical specification of civil aviation AFTN/SITA communication system |
| Title in Chinese: | 民用航空自动转报系统技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2014-02-08 |
| Implemented on: | 2014-05-01 |
| ICS Classification: | 03.220.50-Air transport |
| Chinese Classification: | V54-Air traffic control |
| Professional Classification: | MH-Civil Aviation |
Introduction
Standard Overview
MH/T 4041-2014 was proposed and managed by the Civil Aviation Administration of China, and specifies the technical requirements for the communication protocol interface, telegram format, system composition and terminal equipment of the automatic reporting system. The standard applies to the design, construction and operation of the automatic reporting system of civil aviation control.
Core Technical Requirements
Communication Interface Specifications
| Interface Type | Protocol Standard | Rate Range | Physical Specifications |
|---|---|---|---|
| Synchronous Interface | ITU-T V.35/X.25 | 64kbps-2Mbps | DB34/DB25 DTE |
| Asynchronous Interface | RS232/Current Loop | 50bps-19.2kbps | 9-pin/25-pin D-type |
| Ethernet interface | IEEE 802.3 | 10Mbps-1Gbps | RJ-45 |
Telegram format standard
SITA telegram structure
- Header: Contains circuit identification, sequence number and UTC time
- Receiving address: Supports three-level structure of redirection line/short address line/normal address line
- Priority: SS (highest), QU (urgent), GA (normal)
- Body: Limited to 69 characters/line, total length ≤3840 characters
AFTN special processing
- The address code adopts an 8-bit character structure (country code + place name code)
- The priority is divided into multiple levels such as SS/DD/FF/GG
- Support message segmentation identification (PART n CONTINUED)
System architecture design
Business processing subsystem
Redundant server configuration is adopted, and the following needs to be implemented:
- Code conversion (ITA-2/IA-5)
- Routing check (support fuzzy address matching)
- Message storage and forwarding (historical records are retained for ≥3 months)
Monitoring subsystem function
- Real-time channel status monitoring
- Manual intervention of error messages
- Traffic statistics (by address/time period/type)
Implementation suggestions
Terminal equipment selection
| Processing capacity | RS232 interface ≥ 2000 copies/hour |
| Query response | Combined conditions ≤ 5 seconds |
| Alarm function | Need to distinguish between types such as communication interruption/distress messages |
Operation and maintenance points
- Regularly check the continuity of the serial number (reset at UTC 00:00)
- Configure the primary and backup routing switching mechanism (QSP official telegram trigger)
- Establish a message exception handling process (PDM/COR mark application)
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