What does auto approach do?

Guest wrote:

What does auto approach do and how do I engage the reverse thrusters?

It's called approach mode:

- Approach mode selector button
The approach mode selector button engages the autopilot's approach mode, enabling automatic tracking of a VOR course, GPS course, localizer, or localizer and glide slope for instrument approaches. When engaged:

If the Nav/GPS switch on the panel is set to GPS, the aircraft captures and tracks the course to the next GPS waypoint.
If the Nav/GPS switch on the panel is set to Nav, the aircraft captures and tracks the VOR course, localizer, or localizer and glide slope tuned on the Nav1 radio and set on the VOR1 indicator or HSI.
Intercepting the glide slope

In order for the autopilot to capture a glide slope, you must intercept it from below. Although some real-world autopilots can capture a glide slope from above, standard operating procedure is to intercept and capture glide slopes from below. Thus, many real-world autopilots—and all Flight Simulator autopilots—can only capture a glide slope from below. If you want to intercept a glide slope from above, descend through it, level off, and push the APR button twice to disengage and reset approach mode. Then intercept and capture the glide slope from below.

To engage/disengage Approach mode

Click the APR button.
-or-
Press CTRL+A.

Reverse thrust: F2 key for at least 1 sec.

ok thanks. Don't really get that but thanks.

I understand, it can be intimidating. Just think of it this way. The APR or approach mode is used for instrument landing approaches so that the autopilot will follow the course (also the glide slope if an ILS). Here is a great site that explains much about instrument approaches. 🙂
➡ http://www.navfltsm.addr.com/index.htm

So does it help you line up with the runway?

Guest wrote:

So does it help you line up with the runway?

Yes, it will follow the navigation signal that is aligned with the runway if the runway has that signal. Most large airports have approach aids on most runways, some small airports only have the signal on one runway or even none. The runway must have a ILS, LOC, VOR, GPS approach. You have to intercept that signal at the proper angle, distance and altitude for the approach to work. It's guidance to the runway but it won't automatically steer you to the runway by itself regardless of your position. 🙂