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 check proper generation and then is muted for the remainder of the self test. A proper test pattern verifies correct operation of the weather radar R/T and EFIS symbol generator and EHSI.
 Antenna - The R/T unit automatically exercises the antenna unit to confirm proper operation. It commands a full left sweep followed by a full right sweep to the aximuth limits. Simultaneously, it commands a full up-tilt followed by a full down-tilt to the tilt limits. Upon successful completion of the antenna testing sequence, the R/T unit commands the antenna unit to drive to a dead-ahead azimuth position and to drive to a zero=tilt position, where it stops at the electrical zero positions for the remainder of the test. The antenna test sequence requires less than eight seconds. Proper antenna tilt operation is verified by observing the tilt readout on the EHSI. The tilt readout stops at +15 degrees up, slews to 15 degrees down, and then slews up to zero degrees and stops.
 Azimuth The sweep line on the EHSI is not present during self
 Borescope - test. Verification of a proper azimuth automatic boresight is accomplished by observing that the sweep line begins its motion from the dead-ahead position after the self test mode is terminated.
A normal test pattern is shown in Fig. 8. If the test is satisfactorily completed the normal test pattern will remain and a failure display shown in Fig. 8 will not be present.If the test fails a FAIL message will be present in status message line 3, and the defective LRU or condition will be displayed on fail message line 4 as shown in Fig. 8. The weather radar test pattern will be removed. The following fault conditions will generate the following messages on line 4.
 Receiver/Transmitter Fault -RT
 Antenna Fault -ANT
 Control Fault -CONT
 Attitude Input Fault -ATT
 Calibration Fault -WEAK
 Stabilization Off -STAB
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

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A 737-300/400/500MAINTENANCE MANUAL

EHSI - STATUS AND FAULT DISPLAY

ANNUNCIATION  ANNUNCIATION MEANING OF THE  DISPLAY WXR DATA  ORDER OF PRIORITY OF MESSAGE 
LINE 2 (YELLOW)  LINE 3 (YELLOW)  LINE 4 (YELLOW) 
WXR  FAIL  WEAK  CALIBRATION FAULT  DISPLAYED  FIRST PRIORTY 
WXR  FAIL  ATT  ATTITUDE INPUT FAULT  DISPLAYED  SECOND PRIORTY 
WXR  FAIL  STAB  STABILIZATION OFF  DISPLAYED  THIRD PRIORTY 
WXR  FAIL  RT  FAULT RECEIVER/TRANSMITTER  REMOVED  MESSAGE INHIBITED WXR WEAK, ATT AND STAB
WXR  FAIL  CONT  CONTROL FAULT  REMOVED 
WXR  FAIL  ANT  ANTENNA FAULT  REMOVED 
WXR  DSPY  THRESHOLD EHSI TEMP ABOVE 1ST (75`C)  30 SEC REMOVED AFTER  ALL OTHER WXR MESSAGES INHIBITED
BLANK  BLANK  THRESHOLD EHSI TEMP ABOVE 2ND (100`C)  DISPLAY OFF ENTIRE EHSI 

STATUS AND FAULT MESSAGES

MESSAGE (LINE 1)  COLOR  WXR DATA DISPLAY  CONDITION  EFIS MODE 
DISAGREE WXR RANGE  YELLOW  REMOVED  WXR XCVR RANGE PROCESSED DISAGREES WITH EFIS CP SELECTED RANGE  AND CTR MAP NAV, VOR/ILS MAP, 
WXR/MAP RANGE DISAGREE  YELLOW  REMOVED  CP SELECTED RANGE SELECTED RANGE BOTH DISAGREE WITH EFIS WXR XCVR RANGE PROCESSED AND FMC  MAP 

RANGE DISAGREEMENT MESSAGES
Weather Radar EHSI Status and Fault Messages Figure 7
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH EFIS ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

MAGENTA

RED

YELLOW

GREEN RANGE ARCS

STATUS OR FAIL MESSAGE
FAILED LRU'S

HALF SELECTED RANGE SCALE
NORMAL TEST DISPLAY FAILURE DISPLAY
(YELLOW) PASS/FAIL WXR TEST  (CYAN) DEFECTIVE LRU(S)  CONDITION  WXR TEST PATTERN 
WXR FAIL WXR FAIL WXR FAIL WXR FAIL WXR FAIL WXR TEST WXR FAIL  STAB WEAK BLANK RT ANT CONT ATT  STABILIZATION SWITCH OFF CALIBRATION FAULT TEST PASS ANTENNA FAULT CONTROL FAULT ATTITUDE INPUT FAULT RECEIVER/TRANSMITTER FAULT  ON OFF ON OFF OFF OFF OFF 
　
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