Flightradar24 (and other trackers) Thread Part IV

sparrowcar wrote: »

Was just looking at that. Something flew south over Dublin about 20 mins ago and didn't show up on flightradar. It had a slow flashing white beacon.

ASL 747 maybe?? It showed up on flight radar as an A320 for some reason

roadmaster wrote: »

Why do F35's be identified on trackers. Is for safety in crowded air space that atc has to see them?

As in the F35 lightning stealth fighter?

If so, military aircraft rarely need to "hide" from civilian ATC. If they are "approved" to operate in the country they are in, IE if they are from that country's military, or an ally, then they can essentially do what they want. Military aircraft, or "operational air traffic" as they are known, may fly under rules known as "due regard". This means they are not obliged to talk to civilian ATC or follow any instructions, but would normally still squawk to let ATC know where they are out of courtesy. Under due regard, it is their responsibility to avoid civilian traffic and minimise any impact they will have on civilian traffic and ATC as much as they can.

These rules also apply in international airspace. Each country "owns" their airspace within 12 nautical miles of their coast, and any foreign military aircraft entering that 12nm buffer without the permission of that country's government would be in breach of international law. Control of international airspace beyond this 12 nautical miles is delegated by ICAO, which is a UN body. So for example, airspace up to about 300 nautical miles west of Ireland is controlled from Shannon. (300nm is about the limit that secondary radar can see an aircraft up at 30 whatever thousand feet, the lower the aircraft is flying, the closer it needs to be for radar to see it due curvature of the earth). Anything beyond this 300nm is "procedural" airspace, where time is used to separate aircraft rather than distance. Under radar, we must keep aircraft at least 5nm apart if at the same flight level. In procedural airspace, they used to be kept ten minutes apart, but there are reduced separations now used for aircraft equipped with a technology called ADSB, as there is now a network of satellites which can track aircraft using this technology. Eventually, it is envisaged that these airspaces beyond radar coverage will use ADSB to provide the same "surveillance" separations that are currently provided within airspace that have radar coverage.

So for example, when Russian Bears or Blackjacks fly 100 miles off the west coast of Ireland, they are in international airspace and are not doing anything illegal, but the RAF will send some Typhoons up to fly alongside them, and these Typhoons will squawk so we can see them, and by extension know where these Russian aircraft are and keep civilian aircraft away from them.

So in essence, military aircraft are under no obligation to let civilian ATC know they are there, but normally do out of courtesy.

I notice the geological survey plane hasn't been showing up. It flew over my house the last two Sundays and again today. Perhaps other times, but I wasn't home. Didn't show up on FR any of those times. It was super low today. I'm rubbish at estimating distance, but low enough to see the pilot as it banked. Always happens too fast to snap a quick photo too.

Deleted User wrote: »

An EC35 has been up for some while.

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Garda Air Support-GASU EC135, they have 2 of them & an Islander.

hobie14 wrote: »

Antonov 124 on the way in to SNN ....DMM - SNN ... hope he is bringing some Sun with him ....

Just about heard him on finals over the raging storm..!

California Dreamer wrote: »

Couple of missed approaches right now incl the AF 777 due to wind sheer.

Down safe now

City jet just departing Dublin for Glasgow. Who are they operating for?

[Deleted User] wrote: »

Rescue helicopter up over Donabate Beach

Search operation: https://www.facebook.com/269206916486928/posts/4546468092094101/

When? That can't be right....

A glitch in the system i'd say.... Or one of them gone rogue!

some sort of a small jet flew low West of Lough Ree today. No tracking on FR24. Would this be military?

Also noticed a small cessna (probably doing mapping) that was flying over Lough Ree (took off from Knock this morning) disappeared from FR24 suddenly just now i.e. all previously tracking disappeared along with current position.

Thanks for the responses, looked like the pc9m so that explains that alright!

Taking more notice of the few planes and helicopters we do see, now that the skies are quieter!

faoiarvok wrote: »

The altitude FR24 receives from the aircraft transponder is based on standard pressure of 1013.25 hectopascals.

At that time today, the actual atmospheric pressure at Dublin was 1037hPa. The rule of thumb is roughly 30 feet per hPa, so that’s about 720 feet difference, so roughly 1,070 feet.

Q. Do ATC work off the same transponder data and calculations?