Hi, guys

I am a new pilot here, so i may ask many silly questions to you.

My situation is: When i land with ils Approach, in the middle of the approaching, the approach button will turn off automatically. At different airports, the situation different. For example, I can use approach all the way to land perfectly at jakatar airport. However, HK is the worst. when the aircraft adjusting heading, suddenly approach button off. After it comes back, i am so far from the runway heading already. My ils frequency is correct, NAV mode and runway heading ok. What is the problem? Can anyone help me? I am very frustrated for this.

Thanks for your help.

I also have the same problem. I thought NAV was supposed to bring you into the center of the runway. Is there any way that we can tell before we fly to the airport so we do not have to guess which A/P function to use? Is there something in the Flight Planner that tells us which A/P settings to use for that destination airport?