48--VALVE,CHECK

g source approval by the design control activity in order to maintain the quality of the part. Existing unique design capability, engineering skills, and manufacturing/repair knowledge by the qualified source(s) require acquisition/repair of the part from the approved source(s). The approved source(

s) retain data rights, manufacturing/repair knowledge, or technical data that are not economically available to the Government, and the data or knowledge is essential to maintaining the quality of the part. An alternate source must qualify