747-400 AMM 飞机维护手册 导航 NAVIGATION 2(101)

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 5)  The WXR RANGE DISAGREE message will be displayed when the EFIS control panel range and the weather radar R/T range disagree.
 6)  The MAP/WXR RANGE DISAGREE message will be displayed when there are differences in range between the EFIS control panel, weather radar R/T, and FMC.
 7)  The AUTOTILT FAIL message will be displayed when the WXR antenna tilt mode is set to AUTO and the general input bus 1 from the Ground Proximity Warning Computer is inactive or is sending invalid data. When this condition occurs, the WXR R/T sets the tilt value on label 055 (ARINC 453 bus) to -15.5 degrees to indicate AUTOTILT FAIL.
 D.  System Self-Test (Fig. 12)
 (1)  Three self-tests are used to test and fault isolate the weather radar and are described as follows:
 (a)  By positioning the weather radar control panel mode selector switch to TEST.
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WXR DISPLAY WXR DISPLAY NOT REMOVED REMOVED

FIRST LEVEL OVERHEAT DISPLAY SECOND LEVEL OVERHEAT DISPLAY
ND DISPLAYS

(YELLOW) STATUS/FAIL MESSAGES  MEANING OF THE MESSAGES  WXR DATA DISPLAY  OF MESSAGE ORDER OF PRIORITY 
WXR  WEAK  CALIBRATION FAULT  DISPLAYED  FIRST PRIORTY 
WXR  ATT  ATTITUDE INPUT FAULT  DISPLAYED  SECOND PRIORTY 
WXR FAIL  RT  RECEIVER/TRANSMITTER FAULT  REMOVED  MESSAGE INHIBITED WXR WEAK AND ATT 
WXR FAIL  CON  CONTROL FAULT  REMOVED 
WXR FAIL  ANT  ANTENNA FAULT  REMOVED 
RSTR  INOP  THRESHOLD (105`C) ND TEMP ABOVE 1ST  REMOVED AFTER 30 SEC  INHIBITED ALL OTHER WXR MESSAGES 
BLANK  BLANK  THRESHOLD (120`C) ND TEMP ABOVE 2ND  DISPLAY OFF ENTIRE ND 
BLANK  FAIL AUTOTILT  INVALID EGPWC DATA INOPERATIVE OR  DISPLAYED 

ND STATUS AND FAULT MESSAGES

Weather Radar Status and Fault Message Displays
Figure 10 (Sheet 1)

M50412
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ND RANGE DISAGREEMENT DISPLAYS

MESSAGE  COLOR  WXR DATA DISPLAY  CONDITION  EFIS MODE 
DISAGREE WXR RANGE  YELLOW  REMOVED  WXR XMTR OR FMC RANGE DISAGREES WITH EFIS CP SELECTED RANGE  EXP MAP, CTR MAP EXP APPR, EXP VOR 
MAP/WXR RANGE DISAGREE  YELLOW  REMOVED  RANGE BOTH DISAGREE WITH EFIS WXR XMTR RANGE AND FMC CP SELECTED RANGE  EXP MAP, CTR MAP 

ND RANGE DISAGREEMENT MESSAGES

Weather Radar Status and Fault Message Displays
Figure 10 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 (b)
By initiating a ground test through the CMC using a CDU.

 1)  A ground test under CDU/CMC test control provides an alternate weather radar self-test. The test signal to the R/T is momentary so that a test pattern is not generated. The test does cycle the weather radar self-test circuits and sends back a reply to the CMC which is displayed on the CDUs as PASS or FAIL.

 (c)  
By initiating the self-test using the LCD on the front of the receiver/transmitter.

 (2)  The self-test using the control panel is initiated when the mode selector switch is placed to TEST. Self-test of the weather radar system is described as follows:
 (a)  
During the self-test operation the transmitter transmits for less than one second to verify proper operation of the transmitter then turns off. A test pattern will be present on both ND's.
　
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