747-400 AMM 飞机维护手册 导航 NAVIGATION 2(110)

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 6)  The aural message on the captain's and first officer's loudspeaker is one of the two messages below: a) Go Around-Windshear Ahead, (pause) Windshear Ahead,
 Windhshear Ahead.
 b) WINDSHEAR AHEAD, WINDSHEAR AHEAD. 7) A WXR test pattern showns on the NDs. 8) A 0 degrees tilt code message is on the captains and first
 officers NDs.When the test is complete, make sure that the WXR TEST message is on the NDs.Make sure the test displays on the NDs are as follows (See Fig. 501): 1) The tilt message on the ND will read 0 degrees. 2) A WXR TEST pass message shows. 3) The half range message shows in the center.
 NOTE: No gain message will be shown in the test mode.
____
 4)  The range marks have equal space between them.
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 5)  When the test pattern has completed the scan on the NDs, the self test is completed.
 (o)  
Make sure the test pattern on each ND is as follows: 1) A green color band is at the bottom of the test pattern 2) A yellow color band is above the green band 3) A red color band is above the yellow band 4) A magenta wedge is in the center.

 (p)  
If WXR radar failures occur a WXR message and a WXR LRU message will be shown on the NDs. 1) Refer to the weather radar BITE procedures in the fault

 isolation manual (FIM).

 (q)  
If external failures occur, an antenna tilt code message(s) will show in place of the 0 degrees antenna tilt message on the NDs (See Fig. 502). 1) The tilt code messages on Fig. 502 identify which external

 LRU if faulty. 2) Refer to the weather radar BITE procedures in the fault isolation manual (FIM).
 S 715-205
 (3)  Do a test of the antenna TILT control on the WXR control panel:
 (a)  
Make sure the TILT mode select switch is in the MAN position.

 (b)  
Set the mode selector switch on the WXR control panel to the WX position.

 (c)  
Turn the antenna TILT control on the WXR control panel between +15 and -15 degrees in 5 degree incements. 1) Make sure the ND tilt messages follow the TILT control:

 (d)  
Set the TILT mode select switch to AUTO.

 1)  Make sure the AUTOTILT FAIL status message does not appear on the Capt or F/O Nav displays.

 (e)  
Pull the Ground Proximity Warning Computer (GPWC) circuit breaker D9 on the overhead circuit breaker panel P7. 1) Make sure the AUTOTILT FAIL message appears on the Capt and

 F/O Nav displays.

 (f)  
Set the TILT mode select switch to the MAN position.

 1)  Make sure the AUTOTILT FAIL message on the displays goes out.
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 (g)  
Push in the D9 circuit breaker on the overhead P7 panel to re-activate the GPWC.

 (h)  
Set the SYS switch on the WXR control panel to the R position.

 (i)  
Turn the antenna TILT control on the WXR control panel between +15 and -15 degrees in 5 degree increments. 1) Make sure the ND tilt messages follow the TILT control.

 (j)  
Set the TILT mode select switch to AUTO.

 1)  Make sure the AUTOTILT FAIL status message does not appear on the Capt or F/O Nav displays.

 (k)  
Pull the Ground Proximity Warning Computer (GPWC) circuit breaker D9 on the overhead circuit breaker panel P7. 1) Make sure the AUTOTILT FAIL message appears on the Capt and

 F/O Nav displays.

 (l)  
Set the TILT mode select switch to the MAN position.

 1)  Make sure the AUTOTILT FAIL message on the displays goes out.

 (m)  
Push in the D9 circuit breaker on the overhead P7 panel to re-activate the GPWC.

 (n)  
Set the SYS switch on the WXR control panel to the L position.

 S 865-175
　
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