What is the approximate time before impact for a Look Ahead Terrain Caution?

What is the approximate time before impact for a Look Ahead Terrain Caution?

• A. 10 to 20 seconds
• B. 120 seconds
• C. 40 to 60 seconds
• D. 2 to 5 minutes

Answer: (C)

Look Ahead terrain caution is shown when terrain ahead is predicted to intersect the flight path within a near-future horizon. The system uses your current position, altitude, and speed to project where you’ll be and compares it to the terrain database. The purpose of this look-ahead warning is to give you enough time to take action to ensure terrain clearance, such as leveling off or climbing to a safe altitude, without waiting too long and losing urgency. The time-to-impact for this caution is typically about 40 to 60 seconds, which is long enough to plan and execute a safe maneuver but short enough to reflect a near-term risk. Times like 10–20 seconds would indicate a more immediate threat and would usually trigger a more urgent alert; 120 seconds or 2–5 minutes would be beyond the near-term look-ahead window.

Look Ahead terrain caution is shown when terrain ahead is predicted to intersect the flight path within a near-future horizon. The system uses your current position, altitude, and speed to project where you’ll be and compares it to the terrain database. The purpose of this look-ahead warning is to give you enough time to take action to ensure terrain clearance, such as leveling off or climbing to a safe altitude, without waiting too long and losing urgency. The time-to-impact for this caution is typically about 40 to 60 seconds, which is long enough to plan and execute a safe maneuver but short enough to reflect a near-term risk. Times like 10–20 seconds would indicate a more immediate threat and would usually trigger a more urgent alert; 120 seconds or 2–5 minutes would be beyond the near-term look-ahead window.