Product Code:SAE ARP699 Title:High Temperature Pneumatic Duct Systems for Aircraft Issuing Committee:Ac-9 Aircraft Environmental Systems Committee Scope:This Recommended Practice is intended to outline the design, installation, testing, and field maintenance criteria for a high temperature metal pneumatic duct system, for use as a guide in the aircraft industry. These recommendations are to be considered as currently applicable and necessarily subject to revision from time to time, as a result of the rapid development of the industry.