.
Aircraft heading is within +/- 20° of runway heading. The RAAS triggers the advisory one time when the aircraft enters a runway.

5.11.3. TAKEOFF ON TAXIWAY ADVISORY – NON-ROUTINE

5.11.3.1. PURPOSE
The Takeoff On Taxiway advisory informs the flight crew of excessive taxi speed
or inadvertent takeoff on Figure 5-39: RAAS Take-Off On Taxiway advisory taxiway.
Note: To balance the noise from the engine power setting, the volume level of the Take-Off On Taxiway advisory is increased by +3dB compared to EGPWS call-out volume level.
5.11.3.2. TRIGGERING CONDITIONS
.
Ground speed is more than 40 kt

.
Aircraft is not on a runway.

The RAAS uses a runway database. Therefore, the RAAS is not able to locate taxiways. Rolling on a pavement that is not a runway at high speeds triggers the Take-Off On Taxiway advisory.

5.12. OPERATIONAL RECOMMENDATIONS FOR RAAS
From the AIRBUS flight test campaign, the set of advisories has been limited to three (Approaching Runway, On Runway, Take-Off On Taxiway). AIRBUS has no specific recommendations on RAAS operations. 
.  Refer to FOBN “Runway and Surface Operations – Preventing Runway Incursions” (See AIRBUS References).
Note: The certified AIRBUS RCD enables only RAAS advisories triggered on ground. Therefore, RAAS advisories would unlikely interfere with other call-outs on ground. Indeed, call-outs triggered on ground in AIRBUS cockpits are:
- Predictive Wind Shear (PWS) alerts from Weather Radar (WXR), and WXR alerts have priority over EGPWS ones,
- V1 and RETARD call-outs, and the RAAS does not trigger advisories at the same aircraft speeds.
5.13. REGULATIONS FOR RAAS

At the time of writing the present brochure, there is no mandate for the carriage of RAAS.
5.14. MANUFACTURER FOR RAAS
The RAAS is part of the Honeywell EGPWS. Additional information is available at
http://www.honeywell.com/sites/aero/Egpws-Home3_CB54AACBB-D557-208D-8CE0-EC44CECAAB3B_HD821C499-7201-CF0B-5533-6EFD92534345.htm.
The RAAS requires recent EGPWS software version and terrain database.
Refer to the Honeywell RAAS Product Description available at the link mentioned above.
5.15. FUTURE SYSTEMS
At the time of writing the present brochure, no evolutions are expected, from AIRBUS perspective, for RAAS in terms of new functions.

6. WEATHER SURVEILLANCE
6.1 Description of Weather Radar 6-3
6.1.1 Radar Theory 6-3
6.1.1.1 Reflectivity of Water Molecules 6-3
6.1.1.2 Reflectivity of Thunderstorms 6-4
6.1.1.3 Frequency Band 6-5
6.1.1.4 Gain 6-5
6.1.1.5 Antenna 6-6
6.1.1.6 Radar Beam 6-7
6.1.1.7 Interfering Radio Transmitters 6-11
6.1.1.8 Radiation Hazards 6-11
　
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