Extended Distance of Active Airport Runway
Casual Guide to Runway Thresholds:
Something you might encounter while flying is a displaced threshold – a runway threshold not at its beginning or end. This section of the runway can be used for takeoff in either direction and landings from the opposite direction.
Displaced thresholds have several purposes:1. Protecting nearby areas or objects, like taxiways, runway safety areas, or populated zones, from the impact of landing aircraft.2. Reducing wear and tear on the runway surface from repeated landings.3. Minimizing noise pollution from aircraft landings.
Displaced thresholds are indicated by a white line with white arrows on the runway. Pilots should be mindful of their location and avoid landing before the displaced threshold.
Here are a few key points about displaced thresholds:- The segment of the runway behind the threshold is off-limits for landings in the same direction as the threshold.- The threshold isn't a physical barrier, but pilots should only cross it when necessary.- Planning approach is essential, and pilots should never land before the threshold, even if there's enough runway left.- Displaced thresholds are marked on approach charts and airport charts, so pilots should familiarize themselves with their locations.
Displaced thresholds come in two types: temporary and permanent.
** temporary Displaced Thresholds** are often used during runway repairs or maintenance. They're removed once the work is done, restoring the runway's full length for landings.
Permanent Displaced Thresholds are put in place to address long-term concerns, like terrain obstacles, nearby residential areas, or environmental regulations. This shift ensures that aircraft can approach further down the runway, increasing safety and reducing noise in surrounding areas.
Don't forget, both types require pilots to adjust their approach and landing strategies, so proper markings and communication are vital to avoid errors.
Quick Facts:- Temporary thresholds are transient solutions to avoid obstructions during construction, while permanent thresholds address fixed issues like terrain obstacles or noise reduction.- Both types necessitate modifications to approach procedures and reduce available landing distance, requiring careful planning.
Sources of Info:- Federal Aviation Administration (FAA): Aeronautical Information Manual (AIM) PCG D-3- FAA: 5640.5A - Airport Marking and Lighting- International Civil Aviation Organization (ICAO): Annex 14 - Aerodromes- ICAO: Doc 9157 - Aerodrome Design Manual: Runways
Check out our other article on turn pads on runways for more aviation knowledge!
- In the aviation industry, permanent Displaced Thresholds are implemented to address long-term concerns, such as terrain obstacles, nearby residential areas, or environmental regulations, which can have an impact on financing for airport maintenance and development.
- The transportation sector also benefits from Displaced Thresholds in airports, as they help minimize noise pollution from aircraft landings, reportedly enhancing the financial value of properties in neighboring areas.
