It is the second time Japan’s F-15 fleet has been grounded in three months.

Japan Air Self-Defense Force officials said Saturday that the flight suspension involves all missions except emergency scrambles. They say the suspension will last until the safety of Japan’s 202 F-15 fighters has been confirmed.

No one was injured in Friday’s incident near Komatsu base in western Japan and the pilot landed safely.

The incident comes as Tokyo moves ahead to replace its aging fighters.