The recommendations of this ARP are primarily intended to be applicable to temperature control of compartments@ occupied or unoccupied@ of civil aircraft whose prime function is the transporting of passengers or cargo. The recommendations will apply@ however@ to much broader category of civil and military aircraft where automatic temperature control systems are applicable. PURPOSE The purpose of this Aerospace Recommended Practices is to outline the design considerations and criteria for automatic temperature control systems for use as a guide in the aircraft industry. These recommendations are representative of present engineering practices@ and necessarily subject to revision from time to time due to the rapid development of the industry.