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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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
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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
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú
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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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