ADIRS BITE PAGES - ADIRS L + R GND TEST
General
The ADIRS-IR L+ R GROUND TEST and the ADIRS-ADR L + R GROUND TEST are similar to the IR and ADR ground tests. The only difference is that the L + R ground tests allow you to test both ADIRUs at the same time.
To access the L + R ground tests, select ADIRS on line select key (LSK) 4L from the MAINT BITE INDEX. This shows the ADIRS BITE page.
On the ADIRS BITE page select either ADIRS-IR L + R GND TEST on LSK 3L or ADIRS-ADR L + R GND TEST on LSK 4L.
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737-700 MAINTENANCE TRAINING MANUAL

IF ADIRU INHIBITS GROUND TEST, TEST INOP REPLACES TEST START
A34-21-00-061.fm
ADIRS BITE PAGES - ADIRS L + R GND TEST

January 2005
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A34-21-00-062.fm
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

ADIRS BITE PAGES -ADIRS MAINTENANCE CODES
General
These pages have the description of the ADIRS maintenance codes that can show on the ISDU. Forty codes are permitted, but not all codes are in use. Only the codes in use show on the MCDU. However, CODE 26 and 36 are shown but not used at this time.
To show the ADIRS maintenance codes, push LSK 5L on the ADIRS BITE page. Page 1 of the ADIRS MAINT CODES pages shows.
Use the NEXT PAGE and PREV PAGE keys on the MCDU to move between the ADIRS MAINT CODES pages.
January 2005
34-21

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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

A34-21-00-062.fm
ADIRS BITE PAGES - ADIRS MAINTENANCE CODES
January 2005
34-21
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL

ADIRS - ADIRS MAINTENANCE CODES
General
ADIRS maintenance codes show on the IRS DISPLAY of the ISDU. Some codes give the condition of ADIRS components and signals. Some codes give instructions.
Two or more codes cause the ISDU CLR key light to come on. Push the CLR key to show the codes in sequence.
The ADIRS maintenance codes come from the ADIRUs. Put the SYS DSPL selector in the L position to see codes from left ADIRU. The right shows codes from the right ADIRU.
NOTE: Maintenance codes 26 and 36 are not used.
MCDU Display Pages
You can see the list of ADIRS maintenance codes on the MCDU. The list is a part of the ADIRS BITE.
Critical Fault
If a primary function of the IRU fails, this is a critical fault. The same conditions occur in the air and on the ground for a critical fault. If a critical fault occurs, you may select the attitude mode or you may replace the IRU. The attitude mode may not operate after a critical fault. If a critical fault occurs, you will see these conditions:
-FAULT light on
-Status code 2 shows
-All IRS displays show a failure.

Non-Critical Fault
If a secondary function of the IRU fails, this is a non-critical fault. Non-critical faults may affect navigation performance. Different conditions occur in the air and on the ground for a non-critical fault. If a non-critical fault occurs, you should change the IRU as soon as practical. If a non-critical fault occurs, you will see these conditions:
-FAULT light on, airplane on the ground
-IRS master caution light comes on when the airplane lands
-Status code 2 shows, airplane on the ground or in the air
-All IRS displays show normal.

LIM Non-Critical Fault
Each laser gryo in the IRU has a LIM. The gryo fails if the monitor senses an intensity equal to 1.1 volts. If the gryo fails, it is a critical fault. To warn you of a gryo failure that will occur soon, the IRU has the LIM fault. If any LIM senses an intensity equal to 1.5 volts or less and the airplane is in the air, the IRU sets the LIM fault. The LIM fault does not show in the air. On the ground, you will see these conditions:
　
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