EFFECTIVITY
49-HOW TO USE THE FIM
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MAINTENANCE DOCUMENTS - HOW TO USE THE FIM - INTRODUCTION
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737-600/700/800/900 TRAINING MANUAL MAINTENANCE DOCUMENTS -- HOW TO USE THE FIM - FIGURE 1 Figure 1: Basic Fault Isolation Process
Figure 1 shows the basic fault isolation process. These are the three main steps to the fault isolation process:
-Find a fault
-Go to the fault isolation task
-Do the steps of the fault isolation task.
The information at the right of the step gives more information on how to complete the step.
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MAINTENANCE DOCUMENTS - HOW TO USE THE FIM - FIGURE 1
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737-600/700/800/900 TRAINING MANUAL

MAINTENANCE DOCUMENTS -- HOW TO USE THE FIM - FIGURE 2 Figure 2: Getting Fault Information from BITE
Figure 2 shows how to use the BITE information. The BITE information can show as:
-A maintenance message
-A text message
-A light
-An indication.
If you have a cabin fault, the BITE information does not help you.
To find the fault isolation task for a maintenance message, go to the Maintenance Message Index in the chapter for the related system.
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Some airplane systems have built-in test equipment (BITE). If the system finds a fault when you do a BITE test, it will give you a maintenance message.
A maintenance message can be any of these:
 -
a code

 -
a text number

 -
a light

 -an indication.

To find the fualt isolation task for a maintenance message, go to the Maintenance Message Index in the chapter for the applicable system.
If you do not know which chapter is the correct one, look at the ist at the front of any Maintenance Message Index. For each system or component (LRU) that has BITE, this list gives the chapter number where you can find the Index that you need

Find the maintenance message for the applicable LRU or system in the Index. .
Then find the task number on the same line as the maintenance message. Go to the task in the FIM and do the steps of the task (see Figure 4.)
Getting Fault Information from BITE Figure 2
EFFECTIVITY  49-HOW TO USE THE FIM 
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MAINTENANCE DOCUMENTS - HOW TO USE THE FIM - FIGURE 2
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737-600/700/800/900 TRAINING MANUAL MAINTENANCE DOCUMENTS -- HOW TO USE THE FIM - FIGURE 3 Figure 3: Finding The Fault Isolation Task In The FIM
Figure 3 shows what you need to do to find the fault isolation task in the FIM. The left side of figure 3 asks the question (IF YOU HAVE?). The right side (THEN DO THIS TO FIND THE TASK IN THE FIM:) tells you how to find the task in the FIM.
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MAINTENANCE DOCUMENTS - HOW TO USE THE FIM - FIGURE 3
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737-600/700/800/900 TRAINING MANUAL

MAINTENANCE DOCUMENTS -- HOW TO USE THE FIM - FIGURE 4 Figure 4: Doing The Fault Isolation Task
Figure 4 shows these steps in each FIM task:
-Assumed conditions at the start of the task
-Possible causes
-Initial evaluation paragraph
-Fault isolation steps.
The possible causes show a list of LRUs and things that can cause the problem. The fault isolation steps help to find which of the possible causes made the fault occur.
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MAINTENANCE DOCUMENTS - HOW TO USE THE FIM - FIGURE 4
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737-600/700/800/900 TRAINING MANUAL MAINTENANCE DOCUMENTS -- HOW TO USE THE FIM - FIGURE 5 Figure 5: Subjects at Front of FIM
Figure 5 shows what information is at the front of the fault isolation manual. The front subjects also show in the FIM introduction.
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