YSSY Atis

[Philip Argy]

From this morning's TAF:

LIGHT TO MODERATE NORTHWEST WINDS, FRESHENING AND TENDING SOUTHWEST MID AFTERNOON AND THEN (BAM!) FRESH AND GUSTY SOUTHERLY THURSDAY EVENING.

[Philip Argy]

Can't login to NAIPS today and the old open access ATIS has been taken down. Not impressed.

[Grahame Hutchison]

New version of NAIPS released yesterday by Airservices Australia, even some of the App developers are scrambling to make changes to their connectivity.

[SteveW]

Originally Posted by Philip Argy

Can't login to NAIPS today and the old open access ATIS has been taken down. Not impressed.

That's annoying that they have removed public access.

Anyone know if it will ever be restored?

[Philip Argy]

http://www.airservicesaustralia.com/...ds/NIS-FAQ.pdf

No logic to withdrawal of quick-access free ATIS. Under NAIPS you have to login, select the special briefing screen, enter YSSY with ATIS ticked and NOTAM etc unticked, click Submit, wait another 8 seconds, and get a personalised version of what previously took a few seconds to get with a YSSY-coded URL!

Whose mad idea was this?

[Philip Argy]

This evening we are seeing this:

DO NOT PASS THROUGH THE ASSIGNED RWY CENTRE LINE

What does that mean exactly?

[Fred C]

I believe that means when you are turning onto finals they do not want you to overshoot the extended centreline of the runway. You may drift too close to the other parallel runway centreline.

ie If 16L and 16R are the arrival runways. If the aircraft turning final on 16R drifts too much past the centreline he may encroach the extended centreline of 16L.

If they both do it at the same time then its not good at all.

I hope I have explained that correctly. The piloty types may correct me.

[Hugh Jarse]

Philip, they are telling us the obvious. Typically, aircraft can go through the centreline if: a) too fast a speed for the autopilot to capture; b) a poor (too large an intercept heading) assigned by ATC or a combination of a and b; or c) a disruption of the localiser signal, caused by an aircraft taking off and flying through the beam as an aircraft is about to join the localiser. This can cause problems with the autoflight system, resulting in an overshoot.

I'm sure there are more reasons. These are a few that I've encountered in over 20 years of operating into Sydney.

Hope this helps.

[Grahame Hutchison]

I have had similar instructions from the Tower when doing an approach into Bankstown when there is a good cross wind blowing. ATC are just reminding you to allow for the crosswind turning onto final, to maintain separation from other aircraft on a parallel approach.

[Philip Argy]

I just hadn't seen that in ATIS before and it didn't seem like a standard expression.

I know PRM is normally only used with bad visibility but I wonder when there's strong cross winds if it should be used if there's a horizontal separation concern?