1. The ND tilt message must read tilt angle | 1
_
degree.
2) Turn the TILT control in steps from 0 to minus 15.0(x) degrees. a) Make sure the tilt messages are as follows:
1. The ND tilt message must read tilt angle | 1
_
degree. 3) Turn the TILT control to 0 degrees. 4) Turn the antenna tilt control to -4 degrees.
a) Make sure the intensity of the targets near the airplane increase. 5) Turn the TILT control to 0 degrees.
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747-400 MAINTENANCE MANUAL
6) Set the TILT mode select switch to AUTO. a) Make sure the AUTOTILT FAIL status message does not appear on the Capt or F/O Nav displays.
7) Pull the Ground Proximity Warning Computer (GPWC) circuit breaker D9 on the overhead circuit breaker panel P7. a) Make sure the AUTOTILT FAIL message appears on the Capt
and F/O Nav displays. 8) Set the TILT mode select switch to the MAN position. a) Make sure the AUTOTILT FAIL message on the displays goes out. 9) Push in the D9 circuit breaker on the overhead P7 panel to re-activate the GPWC. 10) Set the SYS switch to the L position.
(d) If no more tests of the weather radar are necessary, Do the Weather Radar System Shutdown Task.
M. Stabilization Test
S 865-178
(1)
Make sure you do the prepare to do the system test before the stabilization test is started.
S 735-110
(2)
Do a test of the weather radar stabilization with the CMC and CDU:
WARNING: DO NOT OPERATE THE WEATHER RADAR WHILE FUEL IS ADDED OR
_______ REMOVED FROM THE AIRPLANE. DO NOT TRANSMIT RF ENERGY WHILE FUEL IS ADDED OR REMOVED IN AN AREA 200 FEET OR LESS OF THE ANTENNA. THIS CAN CAUSE AN EXPLOSION.
DO NOT OPERATE THE WEATHER RADAR IN A HANGAR OR OTHER ENCLOSURE. MAKE SURE NO PERSONS ARE IN THE AREA 15 FEET OR LESS FROM THE ANTENNA WHEN IT TRANSMITS RF ENERGY. RF ENERGY CAN CAUSE INJURY TO PERSONS.
(a)
On the WXR control panel: 1) Make sure the TILT mode select switch is set switch to MAN. 2) Set the mode selector to the WX position. 3) Turn the antenna TILT control to 0 degrees.
(b)
Set the captain's IRS source select switch to the L position.
(c)
Set the IRS-C switch on the IRS mode select panel to ALIGN.
(d)
On a CDU: 1) Push the MENU key on the CDU to show the MENU. 2) Push the line select key (LSK) that is adjacent to <CMC to
show the CMC MENU. 3) If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU. 4) Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu. 5) Push the NEXT PAGE key until you find <34 INERTIAL REFERENCE.
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(e)
(f)
(g)
(h)
(i)
(j)
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6) Push the LSK that is adjacent to <34 INERTIAL REFERENCE the GROUND TESTS menu for the inertial reference system.
7) Push the LSK that is adjacent to the <IRU-L.
8) When the test PRECONDITIONS page shows, make sure each instruction on the page is completed.
9) Push the LSK that is adjacent to START TEST>.
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