The Runway Awareness and Advisory System is a system in the B737 that alerts pilots of their movements around the airport like entering or approaching a runway or special conditions.

The normal callouts are:

• Approaching Runway – Airborne advisory provides the crew with awareness of which runway the aircraft is lined up with on approach.
• Approaching Runway – On-Ground advisory provides the flight crew with awareness of approximate runway edge being approached by the aircraft during taxi operations.
• On Runway – Advisory provides the crew with awareness of which runway the aircraft is lined-up with.
• Distance Remaining – Advisories enhance crew awareness of aircraft along-track position relative to the runway end.
• Runway End – Advisory is intended to improve flight crew awareness of the position of the aircraft relative to the runway end during low visibility conditions.

The non-routing callouts are:

• Approaching Short Runway – Airborne advisory provides the crew with awareness of which runway the aircraft is lined-up with, and that the runway length available may be marginal for normal landing operations. If desired, an additional caution annunciation can be enabled which provides the crew with awareness that the issue has not been resolved when the aircraft is on final approach.
• Insufficient Runway Length – On-Ground advisory provides the crew with awareness of which runway the aircraft is lined-up with, and that the runway length available for takeoff is less than the defined minimum takeoff runway length. If desired, an additional caution annunciation can be enabled which provides the crew with awareness that the issue has not been resolved when the aircraft is on the final stage of takeoff.
• Extended Holding on Runway – Advisory provides crew awareness of an extended holding period on the runway.
• Taxiway Take-Off – Advisory enhances crew awareness of excessive taxi speeds or an inadvertent take-off on a taxiway. If desired, this function can provide a caution annunciation in lieu of an advisory annunciation.
• Distance Remaining – Advisories provide the flight crew with position awareness during a Rejected Take Off (RTO).
• Taxiway Landing – Alert provides the crew with awareness that the aircraft is not lined up with a runway at low altitudes.

Source: SkyBrary.aero

I was on the lookout for a RAAS for my simulator and found a program called vRass. It plays all the right sounds and can be configured in many different ways.

vRaas is a fairly cheap add-on. I payed around €13 / $15. * And it does the job. Only thing I can thing of as a negative thing is that I not am sure if it is the original Honeywell sound set that is used. On the positive side it has a lot of options if you want to tweak the configuration.

But the thing that makes vRass very cool and very interesting for cockpit builders is a free add-on that gives overlays on the navigation displays. For cockpit builders this is interesting stuff! See, normally adding are designed to work inside the flight simulator. But in this add-on not only runs outside the simulator it can even be launched on separate computer. Cockpit builders know we have multiple computers going. vRass needs to be on the MSFS-computer (I think?). But the overlays can be on different computer. In my case I run my navigation displays on a separate computer together with the overlay.

So a good and cheap add-on together with the overlay for cockpit builders it giver a cool effect. I am building a B737. But as this just is a small program that you launch and put on top of your NAV display you can use it with whichever aircraft you would like including the A320.

Google vRass: google.com/search?q=vraas+msfs

The overlay on flightsim.to: Pero vRaas Overlay

* = I bought this add on for own money. It was not sponsored or gifted. I just regally bought it and like it together with the overlay add-on.