Application of a new risk identification method in the development of civil aircraft high lift system

Abstract

High lift system is one of the key systems to ensure aircraft flight safety, so its safety and reliability are highly required.In the development of high lift system, the application of less mature technology will increase the development risk.Combined with engineering data, on the basis of airworthiness safety design and analysis methods, a development technology is established.Taking a civil aircraft high lift system as an example, the risk identification method identifies the technical risks affecting its safety, and gives the technical improvement method and risk control strategy.The results show that there are risks in the non-commanded down of the flap and the non-commanded retract of the flap in a high lift system of a civil aircraft.By reducing the failure probability of the control channel and the monitor channel module of the flap electronic control unit, the failure probability of the non-command down/retract of the flap can be reduced from 1.656×10-9/fh to 9.424×10-10/fh, which meets the system safety requirements and avoids risks.

Keywords

• safety analysis
• risk identification
• risk assessment
• system function hazard analysis
• fault tree analysis