| 摘要 |
PROBLEM TO BE SOLVED: To prevent improper installation of access doors while reducing stress concentrations.SOLUTION: A hole-side convex part 80 is formed in each opening 12A-12C at one or more locations in a circumferential direction, and a door-side rib 70 is formed on each door body 30A-30C. The hole-side convex parts 80 formed in the openings 12A-12C differ in location in the circumferential direction among the plural openings 12A-12C. The door-side ribs 70 formed on the respective door bodies 30A-30C are provided in such locations as not to interfere with the hole-side convex parts 80 provided in the openings 12A-12C in correct combination with the door bodies 30A-30C. |
