KCCU ND
EWD
P/B Mode Selector
Figure 5-36: ROW/ROP/BTV architecture
5.10. FUTURE SYSTEMS
AIRBUS studies the extension of ROW/ROP to the manual braking mode.
5.11. DESCRIPTION OF RAAS
RAAS is an add-on module of the Honeywell EGPWS. It uses the GPS position and the runway data of the EGPWS terrain database. The RAAS Configuration Database (RCD) enables some customization (e.g. GPS antenna position, female or male voice, units in feet or meters) and the settings of some options (e.g. activation/deactivation of some call-outs, audio volume). The RAAS uses the EGPWS resources to produce the call-outs.
The RAAS is capable of 10 different call-outs. There are two certified configuration on AIRBUS aircraft that includes 3 call-outs only (the second certified configuration includes call-outs with lower audio volume). These call-outs are triggered on ground only. The selection of these 3 call-outs is coming out from a long period of evaluations through flight tests and simulator sessions. It has to be noted that a major airline selected the same set of call-outs as a result of an evaluation of several months on other aircraft model.
The following sections describe only the call-outs certified on AIRBUS aircraft. The first two call-outs are routine advisories as the RAAS systematically triggers them on each flight. The last call-out is a non-routine advisory as the RAAS only triggers it when specific conditions are met. All these call-outs are triggered on ground.
5.11.1. APPROACHING RUNWAY – ON GROUND ADVISORY – ROUTINE
5.11.1.1. PURPOSE
The Approaching Runway advisory informs the flight crew that the aircraft is
approaching a runway edge.
The advisory announces the closest runway end (refer to Figure 5-37).
5.11.1.2. TRIGGERING CONDITIONS
.
Ground speed is less than 40 kt
.
Aircraft is within a specified distance to the runway. This distance is a function of ground speed and closure angle. The higher the ground speed, the earlier the advisory.
.
If more than one runway meet the conditions (e.g. two runways within +/- 20° of heading of each other), the advisory is APPROACHING RUNWAYS.
The RAAS triggers the advisory one time when the aircraft approaches a runway.
5.11.2. ON RUNWAY ADVISORY – ROUTINE
5.11.2.1. PURPOSE
The On Runway advisory informs the flight crew on which runway the aircraft is
lined-up.
Note: The AIRBUS flight tests revealed that the On Runway advisory may interfere with the ATC take-off clearance. The On Runway advisory may partially or completely overlap the clearance. This interference may be considered as a nuisance in daily routine operations, especially when weather and visibility are fine. But it was admitted the On Runway advisory to be helpful, especially when weather and/or visibility are unfavorable. To mitigate the nuisance, the latest certified RCD on AIRBUS aircraft permits to significantly reduce the audio volume of routine advisories.
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