Radio Management Panel C12848 Series RMP Test Equipment Issues
RMP (Radio Management Panel) is a radio management panel, which is an important part of the Airbus family of aircraft communication and navigation systems. Its communication part is used to provide tuning frequency and modulation mode control for VHF transceivers and high frequency transceivers. The function of the navigation part is to provide working frequency, working mode and channel selection control for various navigation receivers. The cross-linking of the RMP to the transceiver is primarily achieved through the ARINC 429 serial data bus.
I. Introduction Background
In recent years, China's civil aviation industry has flourished, the number of aircraft has increased significantly, and the proportion of Airbus aircraft purchases has increased. In the Shenzhen Airlines fleet, the radio management panel (RMP) of the C12848 series is loaded on the Airbus model. The manufacturer is Thales, and the maintenance inspection equipment and technical data are also provided by the manufacturer. Due to the high price of equipment, limited data, and fewer domestic RMP test bench manufacturers, RMP parts maintenance work cannot be carried out, and it is difficult to obtain timely guarantee of aviation material turnover. With the rapid development of the aircraft accessory repair industry and great potential, the R12 maintenance inspection volume of the C12848 series is also increasing year by year. It is necessary to design and manufacture new test equipment to enhance the RMP maintenance capability and improve the reliability of work. After the test bench is successfully put into operation, it can save the RMP repair cost, shorten the maintenance cycle and improve the flight operation level.
Introduction to RMP function Briefing
RMP is a frequency control central unit for operating radio communication equipment (VHF, HF) and radio navigation equipment (VOR, DME, ILS, ADF) and is an important part of aircraft communication navigation (see Figure 1). It works in two ways: radio-communication mode (normal mode) and radio-navigation (standby mode). Through the RMP system structure diagram (see Figure 2), the Airbus A320 aircraft has two RMPs. Each RMP has the same hardware and software performance and can be replaced at any time. The only difference is the logic code of the backplane plug connection. different.
Figure 1 RMP appearance and layout
III. Design and production of RMP test bench
According to the manufacturer's CMM manual test requirements, the integrated board is used to build a dedicated automated test platform with modular and micro computer systems. Perform performance tests on RMP through relevant test signals, and perform selective tests (single step, continuous, loop, etc.) on relevant test items, display the test results on the display of the PC, and save or print the test results; The station needs an external display, keyboard, mouse, printer, and the like. The system block diagram is shown in Figure 3.
The test bench mainly includes a 4U standard chassis, an internal integrated circuit board, a front panel, a rear panel, and the like. Figure 4 is a physical diagram of the front panel of the test bench. The main function of the RMP test bench is to provide various power supplies, discrete control signals, status indication signals, and signal switching for the RMP. The test bench mainly includes power control module, discrete I/O module, ARINC signal processing module, serial communication module, microprocessor host and so on. The circuit diagram of the test bench is shown in Figure 5.
According to the manual requirements, the test equipment must comply with the ATLAS specification. The RMP-specific test platform is a dedicated miniaturized ATE device that can be automatically tested. The manual details the modules that need to be tested. The ATLAS specification is available on the ATLAS website, a language description of the aviation-specific standard specification that enables automated testing on open ATE platforms such as ATEC6. Through ATLAS language programming, resources in the ATE platform (such as power control, discrete signals, ARIN429 signals, serial communication signals, etc.) are called during the test to achieve automated testing. Establish a test software interface according to the process design to achieve full functional testing of RMP. The test software interface is shown in Figure 6.
4. Test station use Operation
The performance of the RMP test bench is determined according to the original manual CMM23-13-15. After seeking the relevant equipment manufacturers to make the PCB board and the front panel, the physical test is carried out, and the test bench meets the test requirements of the manual. The parameters tested include:
1) Check the part number and serial number, BITE self-test;
2) Grounding resistance and lightning protection test;
3) RAM, EEPROM and FLASHPROM test;
4) Front panel function test;
5) Discrete input test;
6) Relay, discrete output, clock test;
7) ARINC429 input test;
8) ARINC429 output test;
9) Safety test, power interruption test.
V. Summary of Summary
The test bench scheme introduced in this paper is simple in principle, easy to manufacture, and solves the problem of RMP test equipment without C12848 series. The RMP test bench designed and manufactured has proved to meet the test requirements of the manual after repeated trial and error work. The attached electronic workshop applied for the new RMP maintenance capability of the C12848 series in 2015, and was approved by the bureau at the end of 2016. Currently, it has the ability to repair.
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