WSSS Speed Control

[Canuckian]

I'm looking for someone to enlighten me on Singapore's speed control for arriving aircraft. The area chart states that arriving aircraft shall maintain 250kts at or below 10,000' in the WSSS TCA or when within 40nm of Changi airport. Then on the PASPU 1A STAR there is further speed control noted of 250kts at or above 6000' at POSUB which is much closer to the field than 40nm. Now is it purely redundancy (retentiveness) placing the 250kts/6000A assuming that at POSUB you are already doing 250kts or is this hinting towards something else? Perhaps the 'within 40nm Changi airport' is actually being within 40nm of landing at Changi Airport. Thanks to whomever can help with this convoluted question.

[IMG][/IMG]

[cpt777]

It's warranted that you're confused by the lack of info as far as the illustration from the chart is concerned.
Basically, from the most simplistic understanding; when you're conducting RNAV approaches into WSSS, just comply with whatever speed constraints from the chart. Whereas when you're being radar vectored, the 40nm from WSSS 250kts speed restriction applies.

[Ndicho Moja]

I agree with cpt777's reply. When on the arrival one should fly the speed and altitude requirements/restrictions. If being vectored or no arrival issued or cancelled, a speed restriction on 250kts when within 40nm of WSSS.

[Canuckian]

Thanks gent's.

[crj705]

This is copied straight from the Singapore AIP:

All arriving turbo-propeller and turbo-jet aircraft are to fly at not faster than indicated air speed 250knots when within 40NM from Singapore Changi Airport or when at or below 10,000ft, except all arriving aircraft into Singapore Changi Airport shall comply with the speed restrictions depicted on the transitions and RNAV STARs. Further speed reductions will be regulated by ATC as necessary.


http://www.caas.gov.sg/caasWeb/expor...nr1/ENR1.1.pdf

Paragraph 5.11.2

Just incase you need a reference.

[Canuckian]

Beautiful! Always nice to have it in print. Thanks again all.

[CaptainProp]

In addition to the above comments the 40NM is DME to the airport, not track miles. As you say, "Within 40NM/below 10 000' - speed 250" then again at POSUB 6000A / 250", same same, I.E. the notes are not contradicting each other. I seem to remember being vectored from quite far out and then given "direct POSUB". In this case you're back in the STAR but never "passed" the other RNAV points and thus the speed restriction is there again.

CP

[SMOC]

So can you fly 300kts while on the RNAV STAR within 40DME prior to POSUB?

[CaptainProp]

Not unless assigned "high speed" or equivalent, because then you would violate the "Max 250 within 40NM/Below 10.000' " as per the AIP. The speed restrictions prior to POSUB refer to the hold(-s).

[crj705]

So can you fly 300kts while on the RNAV STAR within 40DME prior to POSUB?

Yes, if you are landing at WSSS. Re-read the paragraph from the AIP.

All arriving turbo-propeller and turbo-jet aircraft are to fly at not faster than indicated air speed 250knots when within 40NM from Singapore Changi Airport or when at or below 10,000ft, except all arriving aircraft into Singapore Changi Airport shall comply with the speed restrictions depicted on the transitions and RNAV STARs. Further speed reductions will be regulated by ATC as necessary.

If you are arriving to WSSS on the arrival, you slow at POSUB not at 40NM.

[cpt777]

Actually you can fly the higher speed (300kts) when you're cleared on the RNAV and you just gotta comply with all the relevant speed constraints. That was the understanding that I recall based on my "previous life" experience. The 250kts below 10000' when within 40nm from the airport is solely when you're on a radar heading. And as mentioned by CaptainProp, you do occasionally get a chance to be cleared DTO certain points on RNAV arrival and resume star thereafter.

[cpt777]

Sorry I should have refreshed the page prior to posting, crj705 explained very nicely there.

[ElitePilot]

As far as i'm aware if you're cleared by atc high speed you're free to go say 300kts (on or off star) below 10000 subject to company sop's.