They are very nice looking aircrafts, hope everything will be OK with the tests of C-X and all the problems will be solved. We have very successful year in terms of new aircrafts' premieres!
Structural Faults Hit Japan's C-X and P-X; KD-767 Also Delayed
Aviation Week & Space Technology
08/06/2007, page 27
Bradley Perrett
Beijing
Printed headline: Cracking Up
First flight of the Kawasaki Heavy Industries C-X will be delayed, after the big Japanese airlifter failed structural tests.
The P-X maritime patroller, a parallel development by the same manufacturer, has also suffered structural problems.
And delivery of the first Boeing KC-767 to Japan has been delayed for a third time—from the end of this month until March—because it has not passed U.S. safety requirements, says the defense ministry.
The ministry will reportedly delay its plan to order the C-X into production by at least one year. The decision was originally to be made during the next fiscal year, beginning Apr. 1, but will not now occur before fiscal 2009.
Tests on a P-X airframe in May resulted in incorrect deformation of the horizontal stabilizer, the ministry says. An investigation found that the C-X was liable to the same fault.
In July, further strength tests on the C-X resulted in cracks around the main landing gear and parts of the fuselage. Then another structural test on the P-X fuselage caused cracks and deformation of the floor of that aircraft.
The ministry still expects the P-X to make its first flight in mid-September, but the C-X will be delayed until December at the earliest. It, too, was supposed to fly in September.
The manufacturer and the ministry’s Technical Research and Development Institute are working to overcome the problems.
The structural weakness is the second big problem to have hit the airframes of the two aircraft. After the prototypes were assembled earlier this year, it was discovered that the U.S. supplier of fasteners had sent a batch of badly made rivets, which had to be found and removed from the two airframes.
Again, it was the C-X that suffered most: 3,663 bad rivets had to be changed on its prototype, compared with 161 on the P-X.
In 369 locations on the C-X airframe, the rivets could not be replaced; so surrounding fasteners were replaced with stronger rivets. The same happened in four places on the P-X.
The 141-metric-ton C-X—a twin-turbofan aircraft comparable with a C-141—also needed other reinforcement.
Kawasaki’s staff worked long extra hours to fix those problems and get the aircraft back on schedule for the September first flights, but the new structural weaknesses will now prevent the C-X from achieving that plan.
Despite its structural problems, the C-X is a simpler project than the P-X, which is to have Japanese-developed engines and combat system. The C-X is powered by commercial General Electric CF6-80C2s.
With Kazuki Shiibashi in Tokyo.
Japan’s C-X airlifter (foreground) and P-X maritime patroller are being developed together. Their horizontal tails have proven too weak, and other structural problems have been found elsewhere in the aircraft. Credit: JAPAN MINISTRY OF DEFENSE