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As per FAA FAR 121.358: from 02 JAN 91, an approved airborne wind shear warning and flight guidance system (Reactive Wind Shear), an approved airborne wind shear detection and avoidance system (Predictive Wind Shear), or an approved combination of these systems is required for any aircraft.

Note: Definitions as per AC 25-12
“Airborne Wind Shear Warning and Flight Guidance System: a device or system which identifies the presence of a severe wind shear phenomena and provides the pilot with timely warning and adequate flight guidance for the following:
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Approach/Missed Approach: To permit the aircraft to be flown using the maximum performance capability available without inadvertent loss of control, stall, and without ground contact.

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Take-off and Climb-out: To permit the aircraft to be flown during the initial or subsequent climb segments using the maximum performance capability available without inadvertent loss of control or ground contact with excess energy still available.”

“Airborne Wind Shear Detection and Avoidance System: a device or system which detects a potentially severe wind shear phenomena far enough in advance of the encounter in both the take-off/climb-out profile and the approach/landing profile to allow the pilot to successfully avoid the phenomena and thereby alleviate a flight hazard.”
All AIRBUS aircraft models (except the former aircraft from the A300/A310 family) are fitted with the Reactive Wind Shear from the production line. The very first aircraft from the A300/A310 family aircraft is the A300-B2 certified in 1974. The A310 was certified in 1983 and the A300-600 in 1984. Regulations about wind shear systems appeared in 1991. Consequently, only the most recent A300/A310 family aircraft are fitted with the Reactive Wind Shear from the production line.
The Predictive Wind Shear is proposed as an option on all types of weather radar installed on AIRBUS aircraft.

6.4. MANUFACTURERS FOR WEATHER RADAR
To fulfill the weather awareness function on A300/A310/A320/A330/A340 aircraft, AIRBUS proposes the following four systems:
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The Honeywell RDR-4B capable of predictive wind shear and Autotilt

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The Rockwell Collins WXR 701X

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The Rockwell Collins WXR 2100 capable of predictive wind shear and Multiscan.

Figure 6-42 provides a simplified view of the weather radar architecture.
WXR
Antenna

Weather Radar
Control Panel

Figure 6-42: Weather Radar architecture
* Link TAWS to WXR only applicable between Honeywell EGPWS to Honeywell weather radar capable of Autotilt.
6.4.1. HONEYWELL RDR-4B
From Honeywell, the RDR-4B capable of PWS and Autotilt is available on AIRBUS aircraft. The Autotilt function is optional.
More information is available at
http://www.honeywell.com/sites/aero/Radar3_C867EC130-221E-7DEE-00E1-9B9088CBF060_H5CBA7513-E2B2-3320-D5A0-AF32226E4F40.htm
　
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