Hello,
I'm an airport designer based in Europe. One of the designs we're working on involves new turnpads for Code Es. I note ICAO regulations for the shape of those turnpads are somewhat conflicting. They state to use a max. nose gear steering angle of 45deg but on next page show an example design where a A350X turns with >60 degrees, much closer to the maximum the aircraft is capable of. This has a big impact on infrastructure size so I want to get this right.
I wonder if I could get your opinion on how those turnpads are used in practice? (especially people experienced with widebodies)
In particular:
-what maximum turn rate do you normally use? I understand it's to minimize slipping but is the 45 degree nose gear steering rule realistic?
-is there any maximum turn rate imposed by airlines?
-What turn type is normal? do you tend to use differential thrust / braking?
-Is there any shape of turnpad you prefer? After the initial taper it can go directly into a turn or have a short section running parallel to the rwy before the turn.
-In smaller aircraft do you tend to use all available pavement or rather make a shaper turn to get around sooner?
Appreciate thoughts, thank you