TYPICAL PPI-B4 CONTROLS

 TCAS MODE SELECTOR Windshear has priority over TCAS alerts.  While in TCAS only mode, a windshear event pops the system into WX/TCAS overlay mode displaying both windshear and TCAS information. The crew can change mode by pressing the TCAS button again. Refer to appropriate TCAS operating handbook for instructions. 

 BRIGHTNESS CONTROL Adjusts picture brightness. 
RANGE SELECTOR 
40 80 160  Selects radar display range. 
20 220 
10 
GAIN  GAIN Controls receiver gain.  Rotate fully clockwise for automatic gain. Gain is automatic in windshear only mode. 
W/S OFF TEST WX WX/T MAP  MODE SELECTOR W/S Windshear Only mode, Icon only, no weather returns. W/S ONLY annunciated, tilt and gain removed.  When above 2300', NO W/S DATA AVAILABLE appears at the screen center indicating inappropriate mode selection.  Activates W/S mode regardless of transponder mode. OFF Indicator is off unless turned on by ACARS or TCAS. Additionally, below 1500' AGL a windshear event automatically turns on the PPI-4B, the antenna sweeps ± 60o (±40o display), indicates selected range, annunciates W/S ONLY, TILT and GAIN are removed and the display shows the windshear icon only. Note: Windshear icon overlays test pattern and radar returns. TEST Selects TEST Mode WX Radar is in weather mode. WX/T Combined weather and turbulence mode. MAPGround mapping mode. 
MSG  MSG Enables ACARS mode.  While in ACARS mode, a windshear event pops the system into WX/TCAS overlay mode. When advisories clear, the system reverts back to MSG mode. Refer to appropriate ACARS operating handbook for instructions. 
0 + 5 5 10 15 15 - TILT Controls antenna tilt ±15o.  Automatic tilt in windshear only mode. 

System Annunciator Lights
Red and Amber Windshear annunciator lights are installed on the forward instrument panel in front of each pilot.  The red lights illuminate in conjunction with a warning level alert and the aural warning of "WINDSHEAR AHEAD, WINDSHEAR AHEAD" on takeoff, or "GO AROUND WINDSHEAR AHEAD" on approach.  The amber lights illuminate in conjunction with a caution level alert and a two tones aural warning.
An amber Windshear inop annunciator is installed on the annunciator panel. This light illuminates any time the windshear systems detects a fault which renders the system inoperative.  The windshear annunciator circuit breaker is located on the Right Radio DC Bus, E-4.
Windshear Icon
The windshear icon consists of red and black bands with straight sides formed by the radials from the aircraft which bound the event.  The arcs closest and furthest from the aircraft depict the minimum and maximum range of the event.
Yellow radial lines appear at the edges beyond the event and extend to the edge of the display to provide directional information for the event.
Procedures
The following procedural chart applies to the predictive windshear system. Continental policy is to avoid all windshear and other hazardous weather.
Note:  Windshear alerts are inhibited on the ground above 100 KIAS to 50 feet AGL.
Phase of Operation  Warning Alert  Caution Alert  Advisory Alert  System Failure 
Before Takeoff  Advise ATC of the location of the Warning Alert. Delay takeoff until the warning is no longer present.  Advise ATC of the location of the Caution Alert. At the Captain's discretion, delay the takeoff, or takeoff and maneuver to avoid the hazard.  Advise ATC of the location of the windshear hazard. After takeoff, maneuver to avoid the windshear hazard area.  Use other means of windshear avoidance in accordance with published FAA windshear recovery guidelines. 
Takeoff Prior  Reject the takeoff. Advise  Assure maximum rated thrust is  Assure maximum rated thrust is  Same as above. 
to V1  ATC of the location of the windshear hazard.  applied. Continue the takeoff, and advise ATC of the hazard and maneuver around the hazard.  applied. Continue the takeoff, and advise ATC of the hazard, and maneuver around the hazard. 
After Takeoff  Assure maximum rated thrust is applied. If the windshear is penetrated, utilize windshear recovery procedures. Advise ATC of the hazard.  Assure maximum rated thrust is applied. If the windshear is penetrated, utilize windshear recovery procedures. Advise ATC of the hazard.  Continue the climb out and monitor the windshear hazard.  Advise ATC of the hazard.  Same as above. 
During  Initiate a normal  At the Captain's  Continue the  Same as above. 
　
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