London Gatwick Implementing Time-Based Separation On Single Mixed-Mode Runway
The title of this post, is the same as that of this article on Flight Global.
These four paragraphs introduce the technique.
UK air navigation service NATS has applied its intelligent arrival separation system to a mixed-mode single runway for the first time, with implementation at London Gatwick.
The system uses dynamic time-based – rather than distance-based – approach spacing in order to maintain sufficient arrival rates in strong headwind conditions.
Headwinds reduce the groundspeed of inbound aircraft flying at a set airspeed. This means a longer interval between two arrivals spaced a fixed distance apart.
“Having to maintain set separation distances in those conditions reduces the landing rate and can have a significant knock-on effect to the airport operation,” says NATS.
I have flown light aircraft onto main runways at major airports several times, including Cardiff, Dublin, Edinburgh, Hamburg, Leeds, Liverpool, Manchester, Naples, Nice, Southend and Stansted.
In one approach I made to Dublin airport, this type of approach may well have been of assistance.
I was flying into Dublin in my Piper Arrow; G-JMTT.
- I had crossed over Anglesey to leave Wales and I was talking to RAF Valley, whilst I crossed the Irish Sea in more of a direct line for Dublin Airport.
- The RAF handed me over to Dublin Approach, who gave me a series of vectors to point me at the main runway at Dublin Airport.
- Dublin Tower, then gave me the instruction. “Tango-Tango Can you speed it up a bit! There’s a Jumbo on your tail!”
- I replied. “Affirmative! Tango-Tango!” I then lowered the nose and pointed it at the runway to speed things up a bit.
- Dublin Tower, then asked. “Tango-Tango On landing, can you expedite clearing the runway?”
- There was then a brief exchange, where I negotiated my route off the runway, by taking the first taxiway on the left and then stopping.
- After a safe landing and a stop on the taxiway, Dublin Tower called. “Tango-Tango! We’ll give you ten out of ten for that!”
- After which the Jumbo rushed past on the runway, with the pilot giving a quick laugh over the radio.
- Dublin Tower called. “Welcome to Dublin!”
The Irish have different ways of doing things!
But, seriously, NATS are probably just implimenting a computerised form of what good air traffic controllers have done for years.
In that arrival at Dublin, the controllers had stretched the time and distance between my small Piper and the Jumbo, so everything was safe.
There alternative would have been to delay one of the planes.
Conclusion
It looks to me that the application of a new algorithm by NATS, will squeeze a few more aircraft into Gatwick’s single runway.
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