Special Conditions; Gates Learjet Corporation Model 55 Series Airplane

These special conditions are issued pursuant to §§ 21.16 and 21.101(b) of the Federal Aviation Regulations (FAR) to Gates Learjet Corporation for an amended type certificate for the Gates Learjet Model 55 series airplane. The Model 55 airplane will have novel or unusual design features associated with an automatic takeoff thrust control system (ATTCS) for which the applicable airworthiness regulations do not contain adequate or appropriate safety standards. The ATTCS will allow the airplane to take off with less than maximum takeoff thrust approved for the airplane; and, if an engine fails, the system will automatically provide maximum takeoff thrust on the operating engine. These special conditions contain safety standards which the Administrator finds necessary to establish a level of safety equivalent to that provided by the regulations applicable to the Gates Learjet Model 55 series airplane because of the novel or unusual features.