Instrument Rating Checkride Practice Test

What are low close-in obstacles?

1. Obstacles more than 1 NM from the airport

2. Obstacles within 1 NM of the departure end of the runway

3. Obstacles at high altitudes near airports

4. Obstacles that do not penetrate the 40:1 surface

The correct answer is: Obstacles within 1 NM of the departure end of the runway

Low close-in obstacles refer specifically to those obstacles that are situated within 1 nautical mile (NM) of the departure end of the runway. These obstacles are critical to understand because they pose risks during takeoff and initial climb phases, where aircraft are operating at lower altitudes and airspeed. The proximity of these obstacles increases the likelihood that an aircraft may encounter them if an emergency necessitates a turn or if engine failure occurs shortly after takeoff. Other options mention distances greater than 1 NM, high altitude obstacles, or those that do not penetrate a specific surface, none of which accurately reflect the definition of low close-in obstacles. Knowing the location and characteristics of these obstacles is vital for flight planning and operational safety, particularly during the departure phase, ensuring pilots can make informed decisions to avoid them.