FAA Releases Turbojet Aircraft Airport Obstacle Analysis Advisory Circular

The FAA has released AC 120-91 Airport Obstacle Analysis which provides “acceptable methods and guidelines for developing takeoff and initial climb-out airport obstacle analyses and in-flight procedures to comply with the intent of the regulatory requirements of FAR §§ 121.177, 121.189, and §§ 135.367, 135.379, and 135.398 and other associated one-engine-inoperative requirements relating to turbine engine powered airplanes operated under parts 121 and 135.” As with most AC’s, the methods and guidelines presented in the AC are neither mandatory nor the only acceptable methods for ensuring compliance with the applicable regulations. Operators may use other methods if those methods are shown to provide the necessary level of safety and are acceptable to the FAA. And, although the AC does not specifically apply to Part 91 turbojet operators, the information in the AC may be implemented by such an operator to the extent that it is applicable to the operator’s needs and requirements, as long as the resulting operations are otherwise consistent with applicable regulations.