P.15.6. A small executive jet cruises at 220 m/s EAS and has an average block journey...
P.15.6. A small executive jet cruises at 220 m/s EAS and has an average block journey distance of 1,200 km. The most critical portion of the aircraft's structure is the undersurface of the wing, which has a fatigue limit stress of +200 N/mm2 based on a mean stress of 90 N/mm2. If the ground-air- ground cycle and other minor loads produce 8 percent of the total damage, estimate the number of hours of the life of the aircraft. Take k 3.0 and /o 6000 m Answer: 11,400 hours