How far ahead of an idling turbojet engine does the danger area extend?

• A. 10 feet
• B. 20 feet
• C. 25 feet
• D. 30 feet

Answer: (C)

Even when a turbojet is idling, it still pushes a strong airstream forward and pulls air in from the front. The danger area in front is defined by the intake suction and the risk of being drawn into the engine, as well as any debris that can be carried into or out of the intake by that airflow. To minimize the chance of injury or being pulled in, a safe stand-off distance of about 25 feet in front of the engine is recommended. Being much closer (10 or 20 feet) increases the risk of contact with the intake or being pulled toward the engine, while 30 feet is beyond the typical minimum but not necessary for most idle conditions. So, 25 feet is the standard distance that balances safety with practicality.