3) Push LSK 6L (<INDEX) two times. a) Make sure that the CDU shows the MAINT BITE INDEX page. 4) Push LSK 4L (<IRS) a) Make sure that the CDU shows the IRS BITE INDEX page. 5) Push LSK 2L (<IRS R). a) Make sure that the CDU shows the IRS BITE TEST - IRS R INDEX page. 6) Push LSK 2L (<CURRENT FAULTS). a) Make sure that the CDU shows the IRS BITE TEST -CURRENT FAULTS R page.
b) Make sure that the CDU shows:
IRU OK
DAA OK
DADC OK
7) Push LSK 6L (<INDEX) two times. a) Make sure that the CDU shows the MAINT BITE INDEX page. 8) Push LSK 4L (<IRS)
a) Make sure that the CDU shows the IRS BITE INDEX page.Do these steps to examine the IRS Interfaces. 1) Set the SYS DSPL switch on the ISDU to the L position. 2) Push LSK 1L (<IRS L).
a) Make sure that the CDU shows the IRS BITE TEST - IRS L INDEX page. 3) Push LSK 3L (<INTERFACE CHECK). a) Make sure that the CDU shows the IRS BITE TEST -INTERFACE CHECK L 1/4 page.
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4)
5)
6)
7)
8) 9)
A
737-300/400/500MAINTENANCE MANUAL
Press LSK 5L (<TEST START) to start the L IRU interface check.
NOTE: Press LSK 5L (<TEST STOP) to stop the test.
____ It may be necessary to do this test several times to view all reactions of the test.
To repeat this test:
-
Press LSK 5L (<TEST STOP).
-
Press LSK 6L (<INDEX). Make sure that the IRS BITE TEST - IRS L INDEX page is displayed.
-
Press LSK 3L (<INTERFACE CHECK). Make sure that the IRS BITE TEST - INTERFACE CHECK L 1/4 page is displayed.
-
Press LSK 5L (<TEST START).
Make sure that for the first 2 seconds these indications occur: a) The ALIGN, FAULT, ON DC, and DC FAIL annunciators on
the left side of the MSU illuminate.Make sure that for the next 8 seconds these indications occur: a) The ATT flag on the captain's EADI comes into view. b) The HDG flag on the captain's EHSI comes into view. c) The HDG flag on the captain's RDDMI comes into view. d) The flag on the captain's VSI comes into view. e) Push the NEXT PAGE key on the CDU to move the display
to page 2/4 of this test. f) Make sure that the pitch angle shown on the captain's EADI agrees with the CDU value. g) Make sure that the roll angle shown on the captain's
EADI agrees with the CDU value.Set the DSPL SEL switch on the ISDU to the HDG/STS position. a) Make sure that the true heading shown on the ISDU
agrees with the CDU value.
NOTE: There is no instrument or ISDU display of the
____
yaw rate.
Push the NEXT PAGE key to move the display to page 3/4 of
this test.
Set the DSPL SEL switch on the ISDU to the TK/GS position.
a) Make sure that the track angle shown on the ISDU agrees
with the CDU value. b) Make sure that the ground speed shown on the ISDU agrees with the CDU value. c) Make sure that the magnetic heading shown on the captain's EHSI agrees with the CDU value.
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A 737-300/400/500MAINTENANCE MANUAL
d) Make sure that the magnetic heading shown on the captain's RDDMI agrees with the CDU value.
NOTE: The value shown for drift angle on the CDU is
____ not shown on the EHSI. The drift angle shown on the EHSI is a different value that comes from the flight management computer.
10) Push the NEXT PAGE key to move the display to page 4/4 of this test. 11) Set the DSPL SEL switch on the ISDU to the WIND position. a) Make sure that the wind direction shown on the ISDU agrees with the CDU value. b) Make sure that the wind speed shown on the ISDU agrees with the CDU value. 12) Set the DSPL SEL switch on the ISDU to the PPOS position. a) Make sure that the latitude shown on the ISDU agrees with the CDU value.
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