在他着陆后用英语可以说 "After he landed" 或者 "Upon his landing".
这个短语的来源是源自英语动词 "land", 意思是着陆、落地。
例句：
After he landed, he turned off the engine and got out of the plane. (在他着陆后，他关掉了发动机，从飞机里出来了。)
Upon his landing, he was greeted by a crowd of enthusiastic fans. (在他着陆后，他被一群热情的粉丝迎接。)