These may include preventive or mitigation strategies selected for particular subsystems. DALs and specific safety design requirements are imposed on the subsystems. The Common Mode Analysis CMA looks at the redundant critical components to find failure modes which can cause all to fail at about the same time. Each hazard is assigned a unique identifier that is tracked throughout the entire safety life cycle.
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The concept of Aircraft Level Safety Assessment is introduced adp the tools to accomplish this task are outlined. The PSSA may contain qualitative FTA, which can be used to identify systems requiring redundancy so that catastrophic events do not result from a single failure or dual failure where one is latent.
The Zonal Safety Analysis ZSA looks at each compartment on the aircraft and looks for hazards that can affect every component in that compartment, such as loss of cooling air or a fluid line bursting. Other methods include dependence diagram or reliability block diagram and Markov Analysis. A fault tree is prepared for each SFHA hazard rated hazardous or catastrophic.
A failure such as a bad resistor in all flight control computers would be addressed here. The SSA may include the results of all safety analysis and be one document or may be many documents.
This Recommended Practice defines a process for using common modeling techniques to assess the safety of a system being put together. The CCA consists of three separate types of analyses which are designed to uncover hazards not created by a specific subsystem component failure.
Guidelines and methods for conducting the safety assessment process on civil airborne systems and equipment. The Particular Risk Analysis PRA looks for external events which can create a hazard such as a birdstrike or engine turbine burst.
The overall aircraft operating environment is considered. DALs and specific safety design requirements are imposed on the subsystems. A subset of this material may be applicable to non This page was last edited on 24 Aprilat FHA results are normally shown in spreadsheet form, with columns identifying function, failure condition, phase of flight, effect, hazard classification, DAL, means of zrp, aircrew response, and related information.
The methods outlined here identify a systematic means, but not the only means, to show compliance. The safety design requirements are captured and traced. For example, the thrust reverser system could be identified by its ATA code Views Read Edit View history. FHA results are coordinated with the system design process as aircraft functions are allocated to aircraft systems.
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This document also presents information on the safety analysis methods needed to conduct the safety assessment. The first 30 pages of the document covers that process.
Untimely deployment of thrust reverser would be a hazard, which could be assigned an identifier based on ATA code Each hazard is assigned a unique identifier that is tracked throughout the entire safety life cycle. User name Password Remember me Log in.
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Introduction to Successful Prediction of Product Performance. News Best Paper Award for Dr. Software is always included in this analysis as well as looking for manufacturing errors or "bad lot" components.
The last pages give an example of the process in action. Cutset analysis of the fault trees demonstrates that no single failure condition will result in a hazardous or catastrophic event. Retrieved from " https: The specific application of such activities needs to be established by the organization conducting the assessment and the appropriate recipient.
The Common Mode Analysis CMA looks at the redundant critical components to find failure modes which can cause all to fail at about the same time. Fault trees may be performed for major hazards if warranted.