. Range: Pilot Flying – 10 to 40 nm, other side at least one range higher 

. Avoid any magenta turbulence cells and monitor the display for weather intensity to avoid any weather threats. 

CRUISE ABOVE FL200 
. System Control: L or R (dual system) or NORM (single system)

. Mode: AUTO 

. Gain: CAL or as required to assess threats. (Refer to GAIN CONTROL on page 23 for more details.)

. Range: Pilot Flying – 20 to 80 nm, other side at least one range higher. 

. Within 60 nm sufficient resolution exists for evaluating cells. At this point Flight Path and Secondary weather will become more prominent and MAN mode can be used for vertical analysis. 

. Avoid any magenta turbulence cells and monitor the display for weather intensity to avoid any weather threats. 

DESCENT AND APPROACH 
. System Control: L or R (dual system) or NORM (single system)

. Mode: AUTO 

. Gain: CAL or as required to assess threats. (Refer to GAIN CONTROL on page 23 for more details.)

. Range: Pilot Flying – 10 to 40 nm, other side at least one range higher. 

. Avoid any magenta turbulence cells and monitor the display for weather intensity to avoid any weather threats.

. Start evaluating cells by 40 nm and finish by 20 nm. 

. Make your weather decision by the 20 nm point. 

AVOIDANCE MANEUVERS 
When considering avoidance maneuvers keep the following in mind: 
. Never deviate under a storm cell or the associated anvil. 

. Plan deviations on the upwind side of storm cells to avoid turbulent downflow air. 

. When flying between storm cells allow at least 40 nm separation. 

. Damaging hail can be thrown at least 20 nm from the storm cell by upper level winds. 

. Avoid all cells showing magenta turbulent areas. 

. Establish an avoidance plan before getting within 40 nm of the cells to allow time to negotiate a deviation with ATC. 

. The height of a storm cell should also be considered when planning avoidance. 

. Avoid all yellow, red, or magenta areas by at least 20 nm. 

. Avoid all green, yellow, red, and magenta areas of cells taller than 28,000 feet by at least 20 nm. 

. Cells exceeding 35,000 ft should be considered extremely hazardous and additional separation (in addition to the 20 nm) should be used. 

SECTION 3: EXPANDED OPERATING INSTRUCTIONS 
TURN ON AND TEST 
Prior to leaving the gate, perform a system TEST.  This will provide a comprehensive check of system performance.  For turn on and test use the following procedure. 
1. Turn the Radar on by selecting weather (WXR) on at least one display.

2. Set the radar system controls as follows: 

a. System Control: TEST. 

b. Gain: CAL. 

c. Range Selection: any range. 

The system initiates Built In Test (BIT) when TEST mode is selected for more than five seconds.  While in TEST mode, a test pattern is transmitted to the active displays.  The following table indicates the timing sequence of visual and aural alerts for normal operations. 
Time 

TEST Selected
 Approx.2 Sec.
 Approx.
4 Sec. 
 Approx. 
6 Sec.
 
PWS FAIL/INOP
 On
 OFF (“ON” if failure is detected)
 
PWS VISUAL ALERTS
 Off
 Amber
(WINDSHEAR)
 Red 
(WINDSHEAR)
 
PWS AURAL ALERTS
 None
 Tone “Whoop, Whoop” 
 or "Monitor Radar Display” 
 “Go Around, Windshear Ahead, … Windshear Ahead, Windshear Ahead” 
　
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