@gituma, you force me to write..hehe :-)  I think auto landing possible if airport equipped with ALS radar. the data like air speed, cross wind, tail wind, weather conditions, altitude, pitch, yaw relayed to plane onboard system. consider this route to work on ALS, typical flight path between Nai-Mombasa, duration 45-50mins on large plane, so pilot is really bored because the plane will fly straight for only 10-15 mins between A and (1)

 

 

                 A     (1)

                * * * *

               *        *(2)

            *             *(3)

          *                 *(4)

NAI _                     _Mombasa

 

 

At point (1) : Initial approach. plane starts to descend. ALS must know that a radar at this point starts the gentle drop in altutide, therefore drop air speed, correct aircraft approach. Plane starts to become a glider.

 

At point (2) : ALS further drops air speed on craft. all factors being processed.

 

At point (3): ALS further drops air speed on craft, first set of flaps deployed eg 10degrees. all factors being processed.

 

At point (4) : final approach ( sometimes point of no return ) ALS now drops flaps 15 or moredeg, Nose of plane must go up, landing gear opened. Engine speed drops but compensates. Rudder control trims final approach and aligns the plane. Flaps now open fully, rudder control important. ALS must control tight turns while rudder, flaps, engine speed, cross winds, tail wind parameters are all working together.

 

Mombasa : Touchdown and the rest @steve covered.