Standard

SAE ARP6821

Publisert
For bestilling og priser av dette produktet ta kontakt med salg@standard.no

Omfang

This document contains information and guidance necessary for the development of a representative, repeatable validation program that may be utilized to assess the capability of SHM systems. The nature of SHM data differs from that seen in traditional nondestructive evaluation (NDE) applications in that the position of SHM sensors is fixed and SHM data can be available much more frequently (if not continuously) over time. This document presents methodologies that can be used to arrive at SHM capability while considering the unique nature of SHM deployment. Each SHM system must be considered independently to determine the applicability and limitations of the guidance contained here for each SHM system being assessed. Purpose ARP6821 provides guidelines for SHM technology users to establish the damage detection capability of their SHM system. It provides guidance on the definition and application of the statistical concepts for POD and how these concepts can be applied to the deployment of SHM technologies in aircraft (both fixed and rotary wing). This document addresses how to satisfy the damage detection capability requirements for an SHM system. It defines different types of SHM detection scenarios and describes how to develop assessment methods for each type of scenario to assess the detection capability. This document also addresses the limitations in establishing the SHM damage detection capability and provides related information that is useful in preparing procedures for conducting SHM interrogations. The nature of SHM data differs from that seen in traditional NDE applications in that the position of SHM sensors is fixed and that SHM data will be available much more frequently (if not continuously) over time. Similarities between NDE and SHM assessments will be highlighted to provide a foundation in traditional damage detection performance measures. In addition, considerations of the controlling factors to be considered when collecting SHM system data will be discussed. The intent is to augment ARP6461 to address specific, unique aspects of quantifying SHM damage detection. As a result, some beneficial overlap with ARP6461 will exist where necessary. However, to avoid redundancy with ARP6461, this document will simply reference ARP6461 when appropriate. Field of Application This document may be applied by SHM stakeholders to assist with, among other things:  • Definition, development, maturation, design, and guidance on certification of SHM systems for application in civil fixed-wing aircraft. Note that guidance for military fixed-wing aircraft is found in AIR6245, while rotorcraft guidance is found in AIR6892.  • Quantifying the damage detection capability of SHM systems while considering all factors that may affect SHM performance.  • Modification of aircraft maintenance and aircraft structural health management to use and benefit from SHM systems.  • Improving maintenance practices by utilizing alternative tools to conventional NDI.  • Execution of scheduled and/or unscheduled maintenance tasks in a more time- and cost-effective manner.  NOTE: Although guidance such as this may be crucial to the successful implementation of an SHM system, use of this guidance alone cannot be assumed to constitute or ensure regulatory agency acceptance. Any regulatory accepted use will require negotiation and agreement with the appropriate regulatory agency. An Overview of This Document This document provides key definitions, guidelines, and examples that can assist civil and military stakeholders in the development of methods for assessing the damage detection capability of SHM systems. The approach adopted in developing the guidelines was to maintain harmony with applicable regulations, standards, and existing guidelines that have been adopted by original equipment manufacturers (OEMs) for aircraft NDE equipment and to augment them, as necessary, with specific interpretations and extensions pertaining to SHM. Where existing acceptable definitions, methods, and processes were available for specific application, they have been adopted with interpretations specific to SHM added for clarity. Additional definitions, methods, and processes have been collated or developed where their equivalents did not clearly exist. In this way, consistency is maintained with existing regulations, standards, and industry-accepted practices. The approach adopted in developing the guidelines was also to develop a self-contained document that can be easily understood by engineering graduates. Applicable documents from which the SHM key guidelines and definitions were collated are listed in Section 2. This document does not replace any existing regulations or certification requirements currently in existence.

Dokumentinformasjon

  • Standard fra SAE_AC
  • Publisert:
  • Versjon: 0
  • Varetype: IS