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On the MCDU I have noticed after setting up the approach there are a number of different codes which appear next to the runway designator these are namely as below:

CI CF FI CD FD

Can someone kindly explain what these codes mean.

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  • $\begingroup$ Hopes OP is setting up approaches in a flight sim, not the real thing... $\endgroup$ – FreeMan Jul 20 '20 at 17:28
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CI = course to intercept

CF = course to fix

FI = fix to intercept

CD = course to DME

FD = fix to DME

These are AIRINC 424 leg types. You can find more information on them here

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