ground staff

noun
1
the people at a sports ground whose job it is to take care of the grass, equipment, etc.
کارکنان زمین, کارگران نگهداری زمین, مسئولان زمین ورزشی
2
the people at an airport whose job is to take care of aircraft while they are on the ground
پرسنل زمینی, کارکنان زمینی فرودگاه