Modelled Approach of Avionics LRUs for System Health Management

Bhargavi G S | Joshua Daniel Raj

Abstract: In this research paper, a complete investigation has been performed regarding the maturity of avionics systems from different phases of the development. Here, the interaction between the various Line Replaceable Units (LRUs) and the Remote Data Concatenator (RDC) through ARINC-429 protocol using SIMULINK is modelled and simulated. The various signals from all the LRUs are combined systematically and arranged by a scheduler, effectively combining them into a single signal through a single channel to the RDC. Further it effectively simulates various situations in which the failure of the system or certain parts of the system occurs. Each condition has been modelled based on the typical reasons for failures and the same is simulated. Hence few LRUs are modelled and ARINC 429 protocol is also designed, and the model is simulated by transmitting data in ARINC format and the receiving the data at remote data concatenator and storing them. Various levels of failures are also modelled and simulated. This helps in better understanding of how the systems work. The simulations are carried out for three LRUs namely: RADALT, AFCS and ADF. Each LRUs at transmitter side are simulated for each parameter, parameters transmitted at various instants, periodicity of all the parameters are also verified. At the receiver, parameters of all the LRUs received at correct instants have been simulated.

Keywords: ARINC 429, LRU, Time-Scheduler, RDC, Label Congruency

Edition: Volume 8 Issue 2, February 2019,

Pages: 1153 - 1157