NAWCAD Patuxent River, Maryland, was tasked by the Federal Aviation Administration (FAA) to determine the High Intensity Radiated Field (HIRF) levels for civil aircraft operating in the U.S.. The electromagnetic field survey will apply to civil aircraft seeking FAA certification under Federal Aviation Regulation (FAR) Parts 23, 25, 27, and 29. The HIRF survey determined the Rotorcraft Severe, Fixed Wing Severe, Certification, and Normal Environments that civil aircraft may be exposed to while operating in the continental U.S. and its territories. The HIRF survey was accomplished by accessing EME data bases, technical manuals, and phone contact with emitter operators to determine the HIRF drivers, analyzing the severity, and providing a U.S. composite environment. These HIRF environments were subsequently provided to the Electromagnetic Effects Harmonization Working Group (EEHWG) for harmonization with the European HIRF environment. The harmonized environments are known as the International HIRF environments that are planned to be used in the FAR advisory material and other supporting documents. The International HIRF environments are also shown in this report for completeness. This report replaces NAWCADPAX--98- 156-TM of 12 November 1998.

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