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 (9)  Weather Radar Mode Displays (Fig. 6)
 (a) The weather radar mode displays are described as follows:
 1)  WX (weather) - EHSIs show area of heaviest rainfall in red, the next lower level of rainfall in yellow, and the least rainfall in green.
 2)  WX+T (weather plus turbulence) - the EHSIs display weather the same as in the WX mode. In addition any turbulence return which indicate area of rainfall and winds within 40 miles of the airplane are displayed in magenta.
 3)  MAP - the EHSIs display terrain mapping returns in red, yellow and green.
 (10) Weather Radar Status and Fault Message Displays (Fig. 7)
 (a)  The EHSI weather radar status, fault messages and range disagreement displays shown in Fig. 6 are described below: 1) If a calibration fault, attitude input fault, or
 stabilization off condition is detected, the EFIS symbol generator (SG) generates a WXR on line 2 and WEAK (calibration) ATT (attitude) or STAB (stabilization) on line 3 respectively. If any two or all three conditions occur simultaneously, the symbol generator will prioritize the messages as follows; highest - WEAK, ATT, and lowest -STAB. All three messages will be inhibited whenever a FAIL condition exits. Weather radar data will continue to be sent from the symbol generator and displayed by the EHSIs. If the EFIS symbol generator receives a transmitter fault, antenna fault or control panel fault, the symbol generator will send a status message WXR on line 2 and a FAIL message on line 3 of the EHSI. In a WXR FAIL condition weather radar data will be removed from the EHSIs by the symbol generator.
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737-300/400/500MAINTENANCE MANUAL
 (11) In the event of an overheat condition on one of the EHSI's the status/fault message would be WXR/DSPY or blank/blank. In either event all weather radar messages would be removed in no longer than 30 seconds.
 (a)  
When the symbol generator senses a disagreement between the EFIS range and the receiver/transmitter range a WXR RANGE DISAGREE message is displayed on line 1 in the center of the EHSI. This message occurs with the EFIS in the NAV, VOR/ILS or MAP modes.

 (b)  
When both the receiver/transmitter range and flight management computer (FMC) range disagree with the EFIS control panel range, a WXR/MAP RANGE DISAGREE message is displayed in the center of the EHSI.

 (c)  
The overtemperature fault indicator on the front panel of the R/T monitors the cooling provided by the R/T mount for the receiver/transmitter.

 D. Self Test (Fig. 8)
 (1)  Selecting the TEST mode on the weather radar control panel results in a system check of circuits not continually monitored by the performance monitor and BITE as explained in Receiver/Transmitter Monitor Functions above.

EHSI Weather Radar Display
Figure 5

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A 737-300/400/500MAINTENANCE MANUAL
WEATHER DISPLAY  DISPLAY WEATHER  MAGENTA 
RED  RED 
YELLOW  YELLOW 
40  GREEN  20  GREEN 

WEATHER OR VARIABLE (VAR) WEATHER  WEATHER/TURBULENCE 
RED 
DISPLAY MAP  80  YELLOW GREEN 

MAP
Weather Radar EHSI Mode Displays
Figure 6

C38752
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 (2)

(3)

(4)

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737-300/400/500MAINTENANCE MANUAL
Self test is designed to compliment the continuously monitored functions by exercising the system for LRU isolation and operator confidence. The self test also checks the data bus between the R/T and the EFIS symbol generator. Self test of the weather radar system, symbol generators and EHSI is described below. R/T - The transmitter transmits for less than one second to
　
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