Hi everyone

Lately my autopilot have not been working properly in the airbus 320 when landing with ILS. The altitude simply does not change what so ever when i try landing using an ILS. I have both approach phase and approach mode active, and still nothing happens. Altitude, speed and heading is also set to managed mode. The weird part is just, that sometimes it does work perfectly, and other times it just simply doesnt. I have a personal checklist, so i am almost 100% sure i do all the same things every time. I have noticed that when it doesnt work, G/S light blue in stead of green on the PFD. Is there anyone that would know what my problem is? 

Thanks

After you have selected the ILS you wish to use, check the RAD/NAV page on the FMC. Sometimes it does not auto populate the ILS frequency. You'll then have to find the correct frequency and enter it.

...jim