Threshold Crossing Height is the theoretical height above the runway threshold at which the aircraft would cross if it maintained the trajectory established by the mean ILS glideslope. This term is known as:

• A. Threshold Crossing Height
• B. Time And Speed Table
• C. Thrust Line
• D. Torquemeter

Answer: (A)

Threshold Crossing Height is the height above the runway threshold at which the aircraft would cross if it stayed on the mean ILS glideslope. This value comes from the glide slope geometry and the threshold elevation, so it’s a fixed reference for a given approach. On a standard 3-degree ILS glide path, the crossing height at the threshold is typically about 50 feet, though it can vary with runway slope or different glide slopes. Pilots use this height to picture where the glide path will intersect the threshold, aiding descent planning, charting minimums, and confirming the approach profile. The other terms listed—time-and-speed table, thrust line, and torquemeter—are not related to glide-slope geometry and describe entirely different concepts.