不時 is read as ふじ (fuji) and means emergency.
ふじ
fuji
ふじちゃく
emergency landing
ふじゅうぶん
insufficient
ふめい
unknown
ふあん
anxiety
ふせい
injustice
ふそく
dissatisfaction
ふさく
low quality (e.g. of literary works)
ふほんい
reluctant
ぶきみ
weird
ふつう
suspension
ふふく
ふうん
misfortune