AC 25-22, ADVISORY CIRCULAR CERTIFICATION OF TRANSPORT CATEGORY AIRPLANE MECHANICAL SYSTEMS

AC NO: 25-22, ADVISORY CIRCULAR CERTIFICATION OF TRANSPORT CATEGORY AIRPLANE MECHANICAL SYSTEMS (MAR 00). This advisory circular (AC) provides methods acceptable to the Administrator for showing compliance with the type certification requirements for transport airplane mechanical systems and equipment installations. This AC is intended to provide guidance to airplane manufacturers, modifiers, foreign regulatory authorities, Federal Aviation Administration (FAA) transport airplane type certification engineers and their designees. The methods and procedures described herein have evolved over many years and represent current certification practice. Like all advisory material, these guidelines are not mandatory and do not constitute regulations. They are derived from previous FAA experience in finding compliance with the airworthiness requirements and represent methods and procedures found to be acceptable by that experience. Although mandatory terms such as “shall” and “must” are used in this AC, because the AC method of compliance is not in itself mandatory, these terms apply only to applicants who seek to demonstrate compliance by use of the specific method described in this AC.