A34-21-00-062.fm
ADIRS BITE PAGES - ADIRS MAINTENANCE CODES
January 1, 2004
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:
-FAULT light on
-IRS master caution light comes on when the airplane lands
-No status code shows
-All IRS displays show normal.
If the airplane takes off or you do a new alignment, the FAULT light goes off. If the LIM senses the voltage again in the air, you will see the LIM fault conditions on the next landing.
A34-21-00-049.fm
January 1, 2004
34-21
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SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
　
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