IFR separation between A/C

Questions for Air Traffic Navigation Services.

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IFR separation between A/C

Unread post by wysiwyg » Thu Mar 23, 2017 4:44 pm

I have been flying around the triangle (DUR, JNB, CPT) over a period of 20 years. It seems that the takeoff separation between aircraft has been increasing the last few years. Even between aircraft of the same type. We are typically limited to 250kts below FL100, so if an aircraft lost an engine, the following aircraft isn't going to catch up to it and create a hazard anyway.
There is one Twr controller at ORT that clears aircraft for takeoff when the one ahead is passing about 500ft agl which is almost as good as what you find in Europe or the USA. It works well and helps the airlines a lot.
Question :
1. What is the current separation criteria?
2. Has it been increased over recent years?

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Re: IFR separation between A/C

Unread post by left10 » Sun Apr 02, 2017 5:59 pm

You just got that controller suspended.
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Re: IFR separation between A/C

Unread post by Thndr_strck » Mon Apr 03, 2017 9:29 am

When in doubt...DON'T !!
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Re: IFR separation between A/C

Unread post by MemyselfandI » Wed Jun 14, 2017 1:55 pm

You just got that controller suspended

No...he/she was probably using the 1minute 45 degree separation.

Years ago big brother was not watching as intently as they do now, so it may seem as if the departure intervals are longer when in fact, they are actually complying with the requirements.
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Re: IFR separation between A/C

Unread post by PushingTin » Fri Feb 09, 2018 5:20 pm

Having worked ATC in SA and now in Australia, it does seem that we push things tighter in Aus...

Same speed a/c, different turns (one left and one right), first a/c 1800m down the runway and airborne, the next one is rolling. Tower visually seperating before a radar standard exists and handed off to departures.

Same speed a/c, same SID, get them airborne to ensure 3nm seperation and hand off to departures.

Different rules if slower a/c ahead on same SID, but still put closer than we do in SA.

Even wake turbulence different here though, we can put a light a/c behind a medium with no wake turbulence sep provided the medium ahead is actually a "light medium" (like a Dash 8 ).

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