Altitude prediction in ND

[cniedzi]

Hi,As far as in know the blue arrow on flight path in ND means the place when the aircraft will reach the altitiude set in altitude window on MCP given it will follow the vertical path commanded by FMC.Is it possible to illustrate an altitude prediction based on manual V/S settings, like "green arc" from boeings?R.Czarek

[cniedzi]

Complementing my previous post I refer to MD-11.R.Czarek

[downscc]

The MD11 simulation does not provide a green arc because the real MD11 does not provide this feature.

[cniedzi]

So, is there any other way to support this prediction?R.Czarek

[Tabs]

Czarek,We're not going to put something on the ND that's not in the real airplane. Only Boeing aircraft have the green arc.

[cniedzi]

No, no.... it would be a sacrilege:) I was just asking about best practices how to achive this goal using available instruments.RegardsCzarek

[Tabs]

Well the standard used in piloting when you don't have fancy green arcs and such is called the "3 to 1 Rule." Roughly, you need 3 miles for every thousand feet you need to descend, assuming a standard 1500-1800FPM descent rate.So if you're coming down from FL390 to a sea level airport for instance - 39 X 3 = 117, so start down 117 nm away from the airport. Or say ATC tells you to descend at your discretion to cross a VOR at FL240 coming down from FL390. That's 15,000 feet you have to descend, so 15X3 = 45 - start down at 45DME to the fix.