Based on following given information and data, assumed a products MTBF=1500 hrs, and which experienced three down activities, please calculate following figures, and state which group people ( Such as passenger, aircraft designer and manufacturer, Airliner etc) who are concerning about them in management.

Time required (hrs)	Down No. 1	Down No. 2	Down No. 3
Corrective repair	28	130	26
Prevent Maintenance	63	118	15
Administration Delay Time	19	28	19
Logistic Delay Time	240	410	340

• Mean Down Time=_______________________________________________
• Inherent Availability=_________________________________________
• Achieved Availability=________________________________________