High Speed Exitways

[MYROSTERSUCKS]

Hi all ! What is the max speed u can be at while vacating rwy using high spd exits? Are they classified in diff categories based on radius of turn or anything else? Thanx!!

[tadex]

Hi there,
to my knowledge they are constructed for speeds up to 60kts. Which should be considered as a maximum ;)

regards

[extreme P]

Looks like your knowledge is sound. :ok:

high speed taxiway

A long-radius taxiway designed and provided with lighting or marking to define the path of aircraft, travelling at high speed (up to 60 kt), from the runway centre to a point on the centre of a taxiway. The high speed taxiway is designed to expedite aircraft turning off the runway after landing, thus reducing runway occupancy time.

[easymoney]

They may also be less than 60kts, so refer to plates where it will be noted.

[MYROSTERSUCKS]

Not mentioned on any jeppessen plate I've seen of late!! Do u know of any specific airfield? WSSS maybe?? Thanx.

[hvogt]

They may also be less than 60ktsAccording to ICAO Annex 14, Volume I, Chapter 3, Nr. 3.9.16:

Recommendation.- A rapid exit taxiway should be designed [...] to enable exit speeds under wet conditions of:

93 km/h [50 kts] where the code number is 3 or 4; and
65 km/h [35 kts] where the code number is 1 or 2.Cheers

hvogt

[easymoney]

Sorry cant remember now......as we fly to so many.

Think it was 50 at the time, maybe just a temp thing, but stook in my mind as something different in my brief.

Best to read the plates, just in case...................

[newbie1972]

And those are the EXIT speeds and assume a constant deceleration I have been told. Additionally, there is a large area where the high speed and main taxy way meet. This allows you to run deep into the exit area while slowing down which avoids a very tight turn on to an opposite direction taxy way if you are still slightly fast.

[easymoney]

In dublin......E6 off RW 28 high speed exit is less than 60kts.


Max 50kts recommended 35kts.

[forget]

IFALPA warns against the misuse of rapid exit taxiways.

http://www.ifalpa.org/sab/2007/07SAB12%20-%20Misuse%20of%20rapid%20exit%20taxiways.pdf

[easymoney]

Thanks for the info.

[Mikehotel152]

With regards that IFALPA policy statement, which states:

...the advantage of rapid exit taxiways is that less time is taken to turn off the runway and not that it allows part of the landing run to be completed on it.

does anyone know of any ICAO/Pans-Ops/EASA definitions of RETs that would back up IFALPA's assertion that the length of the RET should be disregarded when calculating landing rolls?

For the avoidance of doubt, I should add that I don't think using the length of the RETs in the LDA calculation is good airmanship.

[hvogt]

Sorry, too lazy to look up the respective sections, but ICAO Annex 6 clearly defines LDA as that part of the runway (and not runway plus any other part of the manoeuvring area) suitable for landing. Keeping in mind that the 60 per cent landing factor, which is based on LDA, is also defined in Annex 6, you can see that RETs must not be used for performance calculations.

[Mikehotel152]

Thank hvogt