This ARP discusses design philosophy, system and equipment requirements, environmental conditions, and design considerations for helicopter environmental control systems (ECS). The heliocpter ECS comprises that arrangement of equipment, controls, and indicators which supply and distribute dehumidified conditioned air for ventilation, cooling and heating of the occupied compartments, and cooling of the avionics. The principal features of the system are: a. a controlled fresh air supply; b. a means for cooling (air or vapor cycle units and heat exchangers); c. a means for removing excess moisture from the air supply; d. a means for heating; e. a temperature control system; and f. a conditioned air distrubtion system. The ARP is applicable to both civil and military helicopters where an ECS is specified; however, certain requirements peculiar to military applications, such as nuclear, biological and chemical (NBC) protection, are not covered. The integration of NBC protection into aircraft ECS is discussed in AIR4362. The purpose of this ARP is to provide the guidelines and requirements for analysis, design, and installation of helicopter ECS.
SAE ARP292C-1998 Referenced Document
SAE AIR1539-1981 Environmental Control System Contamination ((Editorial Change July 31@ 1981))
SAE ARP89 TEMPERATURE CONTROL EQUIPMENT, AUTOMATIC AIRPLANE CABIN
SAE ARP986 GUIDE FOR QUALIFICATION TESTING OF AIRCRAFT AIR VALVES
STANAG 2895-1990 Extreme Climatic Conditions and Derived Conditions for Use in Defining Design/Test Criteria for NATO Forces Materiel (ED 1; Amendment 1: 07/11/2002; To obtain please contact your national Defense Standardization Office or the NATO Standardization Office w