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This guide is neither mandatory nor regulatory in nature and does not constitute a regulation or legal interpretation of the regulation. These concerns are based on the phenomena where electronic circuitry fails to operate as intended i.
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High Level Tests are performed using peak and average field levels determined for one of three particular HIRF environments over a 5538 frequency range up to 18 GHz.
If the document is revised or amended, you will be notified by email. Subscription pricing is determined by: HIRF Testing of Aircraft Systems April 5, Early aircraft designs typically consisted of a series of cables, chains, cranks and various other mechanisms to operate the systems which made the aircraft fly. However, these changes give rise to myriad new concerns related to electromagnetic interference EMI of critical on-board electronic systems.
This requires several factors to be considered prior to testing such as the need for specialized high power test equipment, aircraft system instrumentation and flight emulation, RF hazards regarding fuel ignition and personnel exposure and adherence to national RF transmission rules and regulations.
Please first verify your email before subscribing to alerts. Please first log in with a verified email before subscribing to alerts. This standard is not included in any packages. An applicant may elect to establish an alternative method of compliance that is acceptable to the cognizant airworthiness authorities. Add to Alert PDF. Generally, 2-D and 3-D computational models of the airframe up to the first electrical resonance are required.
Your Alert Profile lists the documents that will be monitored. However, the Low level test requires a complex analytical modeling approach to ensure compliance. Models are required to estimate the level of influence ground plane coupling will have on low level swept current test results, especially where it is impractical to elevate the aircraft safely due to its size.
This standard is also available to be included in Standards Subscriptions. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. This approach is preferred over high level testing for its reduced RF exposure levels and RF hazard considerations.
You may delete a document from your Alert Profile at any time. Early aircraft designs typically consisted of a series of cables, chains, wrp and various other mechanisms to operate the systems which made the aircraft fly.
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Need more than one copy? Proceed to Checkout Continue 553. Therefore, the need for EMI testing has never been more important for all commercial and military aircraft in use today. Due to increasing advancements in the field of electronics over the last 60 years, mechanical flight control devices are being replaced or augmented with electronic circuitry for enhanced accuracy, reliability and, most of all, human safety.
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. This process uses a direct drive method up to the first airframe electrical resonance, and a radiated field test methods above the first airframe resonance. As the voice of the U. Often times the aircraft size prohibits the use of conventional anechoic lined EMI test chambers and special permits are required for performing the testing process outdoors.
While this document is generally consistent with AC and draft HIRF AMJ, users of this document should verify that the guidance in this document is acceptable to the cognizant airworthiness authorities. The information in this guide represents a collection of best engineering practices that have been used to certify aircraft HIRF protection. Already Subscribed to this document. Standards Subsctiption may be the perfect solution.