Sustainment of MEA EWIS

03/02/2015
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Sustainment of MEA EWIS

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application/pdf Sustainment of MEA EWIS Michael Traskos, Stephen Traskos, Carina Cannon
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Sustainment of MEA EWIS

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Title: Sustainment of MEA EWIS Authors: Michael Traskos (Lectromec), Stephen Traskos (Lectromec), Carina Cannon (Lectromec) Author Address: 4230-K Lafayette Center Drive, Chantilly, VA 20151 USA Background With growth of electrical systems on aircraft, EWIS sustainment efforts become necessary. The push for these has activities has increased significantly over the last twenty years, with the largest push for improvement EWIS maintenance occurring in the last decade. Statistics and trends of EWIS Maintenance This paper will present the analysis of available EWIS data gathered from the FAA’s Service Difficulty Report (SDR) database. This system contains the service difficulty reports for US operated aircraft. Although this database does not provide insight into all EWIS related issues of US operated aircraft, it does provide good data for identifying trends and system reliability. The data analysis shows the compiled failure rates of EWIS components. This review breaks the time period into two periods: 2000 – 2008 (the pre-EWIS regulation time) and 2009 – present (during and after implementation of the FAA’s Enhanced Zonal Awareness Program (EZAP)). This paper will discuss the trends found in the data and what this suggests for the future of EWIS maintenance. Since 2009, US operators have had to operate an EWIS EZAP. This paper discusses the impact of this inspection program on airworthiness and maintenance operations. The thoughts of a US operator are included. Path for EWIS Review and Sustainment Lastly, this paper will present the approach military organizations are taking to sustain EWIS on their MEA. Created by the USAF, the MIL-HDBK-525 handbook, now integrated into the Mechanical Subsystems Sustainment Standard, MIL-STD-1798, combined industry, regulatory, and military guidance into a single document for EWIS sustainment. This document is impacting the assessment procedures several nations are using for their fleet sustainment. This seven task handbook provides a path for EWIS sustainment. Task #1 covers the gathering and assessment of EWIS data. This outlines the EWIS Service Life Extension Process (SLEP) risk assessment process to obtain data necessary to document an aircraft’s EWIS, identify the critical circuit paths, and gather equipment functionality. This information is to be used to perform a preliminary aircraft impact assessment of EWIS component failures. The paper will review each of these tasks and provide recommendations on how they might benefit operators. The first step of the EWIS documentation process is to perform an aircraft functional hazard assessment. The preliminary assessment is performed utilizing two inputs: aircraft level effects (through device assessment or existing data) and aircraft zone information divided by environmental zone (i.e. temperature, vibration, humidity etc.). This task primarily consists of gathering wire data and electrical system data (i.e. connectors, splices, wires, circuit breakers etc.) needed to conduct the failure hazard assessment. The second task describes the data analysis processes that can be used to determine hot spots, scale of EWIS repairs, areas for focus during inspection, and the overall risk assessment process to support EWIS SLEPs. Analytical methods are presented that could be used to identify conditions and/or performance gaps. Task three Applying the SLEP handbook guidance will improve the likelihood of properly identifying and correcting EWIS degradation issues. The basis for the guidance in task #3 comes from an amalgamation of military, industry, and regulatory publications on EWIS investigation procedures. Task four objectives are to determine the current condition of EWIS components and assess the remaining component service life. These goals are accomplished through general assessment methods, techniques, and focus sampling from the fleet. Task five focuses on the development of an EWIS risk assessment based on the data collected in Tasks 1- 4. In practice, this stage applies common risk assessment processes (further details on general risk assessments process can be found in MIL-STD-882). Discussion will focus on how this can be done in an economical process for commercial fleet operators. Task six and seven set a plan of action and prioritization of EWIS sustainment activities. Discussion will place attention on commercial fleet needs and limiting the impact on availability.