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depends upon these conditions:
* Position of the windshear relative to airplane heading
* Distance to the windshear
* Airplane flight phase - takeoff or approach.
PWS Warning Area
During takeoff, PWS gives a warning if it detects a windshear
threat in this area:
* Less than 0.25 NM on either side of the airplane projected
magnetic heading
* More than 0.5 NM but less than 3 nm ahead of the airplane.
During approach, PWS gives a warning if it detects a windshear
threat in this area:
* Less than 0.25 NM on either side of the airplane projected
magnetic heading
* More than 0.5 NM but less than 1.5 nm ahead of the airplane.
PWS inhibits new windshear warnings during takeoff and
approach if both of these conditions exist:
* Airspeed more than 100 knots
* Less than 50 feet radio altitude.
PWS Caution Area
PWS gives a caution if it detects a windshear threat in this area:
* Within 25 degrees on either side of the airplane projected
magnetic heading
* More than 0.5 nm but less than 3 nm ahead of the airplane
* Not in the PWS warning area.
PWS inhibits new windshear cautions during takeoff and
approach if both of these conditions exist:
* Airspeed more than 80 knots
* Less than 400 feet radio altitude
All PWS alerts are inhibited above 1200 feet radio altitude.
PWS Warning - Flight Deck Effects
A PWS warning has these visual and aural annunciations:
* Red WINDSHEAR message on the PFD
* Red WINDSHEAR message on the ND
* Aural annunciation - WINDSHEAR AHEAD, WINDSHEAR
AHEAD (takeoff)
* Aural annunciation - GO AROUND, WINDSHEAR AHEAD
(approach).
PWS Caution - Flight Deck Effects
A PWS caution has theses visual and aural annunciations:
* Amber WINDSHEAR message on the ND
WXR SYSTEM - PWS OPERATION
EFFECTIVITY
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* Windshear symbol on the ND
* Aural annunciation - MONITOR RADAR DISPLAY.
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EFFECTIVITY
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WXR SYSTEM - PWS OPERATION
WXR SYSTEM - PWS OPERATION
EFFECTIVITY
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General Description
Weather radar with predictive windshear (PWS) detects
windshear ahead of the airplane. PWS uses this data to
detect windshear:
* Doppler radar returns
* Inertial data
* Air data.
If PWS detects a windshear condition, it alerts the flight crew
with visual and aural annunciations.
System On/Off - Takeoff
PWS turns on when the airplane is on the ground and has one of
these conditions:
* Throttles move through 53 degrees
* Flight crew pushes the WXR button on an EFIS control panel.
The WXR button on the EFIS CP does not turn off the PWS if the
throttle levers are above 53 degrees. PWS turns off
automatically when the airplane climbs above 2300 feet radio
altitude.
System On/Off - Approach
PWS turns on automatically when the airplane descends below
2300 feet radio altitude. PWS turns off when one of these
conditions occur:
* Airplane lands
* Airplane climbs above 2300 feet radio altitude.
If PWS is on and WXR is not selected on the EFIS CP, all
antenna sweeps search for windshear. If WXR is selected, the
antenna uses one sweep to search for windshear and the other
sweep to search for normal weather returns. PWS operation
does not affect the WXR mode or range selected by the flight
crew.
PWS Display
If PWS detects windshear, it makes a windshear symbol on the
ND. The symbol is red and black bars. Yellow bars go from the
edges of the symbol to the compass rose. The yellow bars help
the crew to see the PWS symbol.
The ND mode selector must be in a correct mode for the
windshear data to show. These are the ND modes that show
windshear data:
* Expanded APP
* Expanded VOR
　
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