Which airports use MLS?
 

Which airports use MLS? as far as i know,it's costlier...and correct me if i'm wrong,not every a/c has the equipment to use it..

Dont know if any now, but I think it was used / experimented with in Russia abit and I remember hereing it was also experimented with in Cranfield UK but them just fables maybe.

Toronto City Centre Airport (YTZ) had MLS a number of years ago.
However, it's been removed as far as I know.

There was MLS at Heathrow but it was only ever used for trials. Hasn't the system been scrapped?

At least one MLS system in Anchorage, AK has been decomissioned. I don't know for sure if any remain.

ISTR there was one at Sydney as well, but that has disappeared too...

Bren - did you ever have one of the "equipped" BA 757s (I think there was a 767 as well) pitch up for the trial? Transponder code and all.

At the risk of being labelled a pedant - and as others have subtly pointed out - airports don't use an MLS, aeroplanes do.

And just to prove that this isn't a completely wasted post, there was one at Cardiff a few years back, maybe ten years ago. I think it was part of the same trial as resulted in the installation at Heathrow - might have been a different manufacturer's bit of kit to permit comparison. No idea if it's still there I'm afraid.

MLS in the US
 

There are a few airports in the US that have MLS approaches still - Google search . If it works, should return about four pages of airports with MLS approaches. Mostly military or Alaskan airports.

Edit: Ignore the MLS VOR and the KMLS airport.

MLS was tested in Charles De Gaulle LFPG several years ago.
I recall Air France installed special equipment on board some A310 for those tests.

When I left ATC at the beginning of this year, Heathrow was in the process of having MLS installed on all four ends of the parallels. As I recall, the principal user initially would be the BA airbus fleet. The advantage would arise in low visibility conditions when these aircraft could be positioned closer to the aircraft ahead because with MLS equipped aircraft, the localiser sensitive area constraints do not apply. This would increase hourly runway capacity in low vis conditions. I don't know how far the project has progressed.

The plan is that they are still going to be installed on all four runways at Heathrow. our Ops people are working with the CAA on procedures at the moment.

Microwave Landing System...
The only airport in Australia fitted with the system was Canberra (CBR)
I beleive it was an Austaralian invention more acurate than other ILS systems
Was to be fitted to many comercial aircraft in Australia until GPS made it somewhat redundant.
Only aircraft I have seen with MLS systems were ex BA 767 operated by QF. Fitment was by BA for landing at LHR etc where landing in PEa soup is a common thing.

I have not heard of any new MLS installations at airports due to local GPS ground stations being fitted to many airports for accurate GPS approaches.
Only way MLS will get up again is if the USA threatens to turn off GPS systems
My 2 cents

The only places I've ever seen them is at US Air Force Bases. There is one set up at Little Rock Air Force Base in Arkansas. As mentioned before, it would be a good system, if there was no GPS.

I'm pretty sure that the NASA Shuttle Landing Facility (KTTS) has an MLS system. If I recall correctly the shuttle uses it. Also, from talking to a Controller who was a QA Facility rep he said that one of the major reasons that they wanted to implement it was for the multiple and curved "localizer" beams, enabling them to vector multiple aircraft onto the Final approach course and to set up a precision approach at airports that have obstructions on the final approach course.